What is the Interstate SRM-31 battery. Who manufactures it. What are its key specifications. How does it perform in various applications. What maintenance tips should owners follow. What are the pros and cons of this battery model.

Understanding the Interstate SRM-31 Battery

The Interstate SRM-31 is a popular deep cycle battery that has gained recognition among boating enthusiasts, RV owners, and golf cart operators. This versatile power source is designed to provide steady, long-lasting energy for a variety of applications.

Who Manufactures the SRM-31?

Interstate Batteries, a renowned American company with over seven decades of experience in battery technology, produces the SRM-31. Their expertise in crafting high-quality batteries has made them a trusted name in the industry since 1952.

Key Specifications of the SRM-31

• Voltage: 12V
• Amp hour capacity: 105Ah
• Reserve capacity: 160 minutes
• Cold Cranking Amps (CCA): 770
• Weight: Approximately 70 pounds
• Group size: 31
• Design: Deep cycle with high vibration resistance

These specifications make the SRM-31 a robust choice for various applications requiring sustained power output over extended periods.

Applications and Performance of the Interstate SRM-31

The SRM-31’s versatility allows it to excel in numerous scenarios. Its dual-purpose design provides both strong cranking power and deep cycling capability, making it suitable for a wide range of uses.

Common Applications

1. Marine use (trolling motors, onboard electronics)
2. RV accessories (lighting, water pumps, power jacks)
3. Golf carts
4. Electric vehicles (forklifts, utility vehicles)
5. Renewable energy systems

The SRM-31’s high reserve capacity and amp hour rating enable it to handle multiple deep discharge cycles, making it ideal for these applications.

Performance in Marine Environments

For boating enthusiasts, the SRM-31 shines as a reliable power source. Its ability to power larger trolling motors that draw more current, coupled with its capacity to run onboard electronics like fish finders, GPS units, and stereos, makes it a popular choice among marine users.

Maintenance and Care for the SRM-31 Battery

Proper maintenance is crucial for maximizing the lifespan and performance of the SRM-31 battery. Following these guidelines can help ensure optimal operation and longevity:

• Recharge after each use to prevent extended periods of discharge
• Clean terminals and connections monthly to avoid corrosion
• Check water levels bi-monthly if the battery is serviceable
• Avoid deep discharges below 50% capacity
• Store in a cool, dry place away from extreme temperatures
• Use a regulated smart charger to prevent overcharging
• Perform equalization charges every few months to balance cells

With diligent care, an SRM-31 battery can potentially last 4-6 years or even longer, providing reliable service throughout its lifespan.

Advantages of Choosing the Interstate SRM-31

The SRM-31 battery offers several benefits that contribute to its popularity among consumers:

• Trusted brand with a long-standing reputation for quality
• Effective balance of cranking power and deep cycling capabilities
• Substantial 105Ah capacity for extended runtime
• Durable polypropylene case that resists vibration and impact
• Competitive pricing for its performance class
• Wide availability through numerous retailers
• Made in the USA

These advantages position the SRM-31 as a reliable and cost-effective choice for many users seeking a high-performance deep cycle battery.

Considerations Before Purchasing

While the Interstate SRM-31 offers many benefits, potential buyers should consider a few factors before making their purchase:

Size and Compatibility

The SRM-31 is a tall Group 31 battery. Does it fit in your designated battery compartment? Measuring your battery box beforehand can prevent compatibility issues.

Capacity Ratings

The 105Ah rating is based on a 20-hour capacity. How does this align with your power needs? Remember that higher current draws will result in lower effective capacity.

Application Suitability

Although it’s a dual-purpose battery, the SRM-31 is optimized for deep cycle applications. Is this the best fit for your specific use case?

Warranty Coverage

Interstate offers a 1-year free replacement warranty. How does this compare to other options in the market? Is it sufficient for your needs?

Real-World Performance and User Feedback

Understanding how the SRM-31 performs in real-world scenarios can provide valuable insights for potential buyers. User experiences and feedback often highlight aspects of the battery’s performance that may not be immediately apparent from specifications alone.

Marine Applications

Many boating enthusiasts report positive experiences with the SRM-31, particularly in powering trolling motors and onboard electronics. Users frequently mention the battery’s ability to maintain consistent power output throughout long fishing trips, even when powering multiple devices simultaneously.

RV Usage

RV owners appreciate the SRM-31’s capacity to handle the diverse power needs of their vehicles. From running interior lighting and water pumps to powering entertainment systems, the battery’s performance in RV applications is generally well-regarded.

Golf Cart Performance

In golf cart applications, users often note the SRM-31’s ability to provide steady power throughout a full round of golf, even on courses with challenging terrain. The battery’s deep cycling capabilities shine in this context, where repeated discharge and recharge cycles are common.

Longevity and Durability

Many users report that with proper maintenance, their SRM-31 batteries have lasted beyond the expected lifespan, sometimes reaching 6-7 years of reliable service. The battery’s resistance to vibration and impact is frequently cited as a contributing factor to its durability, especially in marine and off-road applications.

Comparing the SRM-31 to Competitors

To make an informed decision, it’s crucial to understand how the Interstate SRM-31 stacks up against similar batteries in its class. Let’s compare it to some popular alternatives:

Optima D31M BlueTop

The Optima D31M is known for its high performance and maintenance-free design. How does it compare to the SRM-31?

• Higher CCA (900 vs. 770 for the SRM-31)
• Slightly lower capacity (75Ah vs. 105Ah for the SRM-31)
• More expensive than the SRM-31
• Sealed AGM design requires no maintenance

Trojan 31-AGM

Trojan is another respected name in deep cycle batteries. Here’s how their 31-AGM model compares:

• Similar capacity (100Ah vs. 105Ah for the SRM-31)
• Higher price point than the SRM-31
• AGM technology offers better resistance to vibration
• Longer warranty (24 months vs. 12 months for the SRM-31)

VMAXTANKS AGM Deep Cycle Battery

VMAXTANKS offers a competitive option in the Group 31 size. How does it stack up?

• Higher capacity (125Ah vs. 105Ah for the SRM-31)
• Similar price range to the SRM-31
• AGM technology for maintenance-free operation
• Lower brand recognition compared to Interstate

While these competitors offer some advantages, the SRM-31 remains competitive due to its balance of performance, price, and brand reliability.

Environmental Impact and Recycling

As environmental concerns become increasingly important, it’s worth considering the ecological aspects of battery use and disposal. How does the Interstate SRM-31 fare in this regard?

Manufacturing Process

Interstate Batteries has implemented various initiatives to reduce the environmental impact of their manufacturing processes. These include:

• Energy-efficient production facilities
• Use of recycled materials in battery production
• Efforts to reduce water consumption and waste generation

Recycling Programs

Interstate Batteries is committed to responsible recycling of used batteries. They offer a comprehensive recycling program that includes:

• Collection points at many Interstate Battery retailers
• Partnerships with recycling facilities to ensure proper processing
• Education initiatives to promote battery recycling awareness

By choosing the SRM-31, users can feel confident that they’re supporting a company with a strong commitment to environmental stewardship.

Maximizing the Lifespan of Your SRM-31 Battery

To get the most value out of your investment in an Interstate SRM-31 battery, it’s essential to follow best practices for battery care and usage. Here are some advanced tips to extend your battery’s lifespan:

Optimal Charging Practices

Proper charging is crucial for maintaining battery health. Consider the following:

• Use a multi-stage charger that can deliver the appropriate charging profile
• Avoid leaving the battery in a partial state of charge for extended periods
• Implement a regular equalization charging schedule to prevent sulfation
• Monitor charging temperatures and adjust accordingly to prevent overheating

Temperature Management

Temperature extremes can significantly impact battery performance and lifespan. To mitigate these effects:

• Install the battery in a well-ventilated area to prevent heat buildup
• In cold climates, consider using an insulated battery box
• Avoid exposing the battery to direct sunlight or extreme heat sources
• Adjust charging parameters based on ambient temperature

Regular Inspection and Maintenance

Proactive maintenance can catch potential issues before they become serious problems:

• Perform monthly visual inspections for signs of corrosion or damage
• Check and tighten connections to ensure optimal conductivity
• Monitor electrolyte levels (if applicable) and top up with distilled water as needed
• Keep a log of battery performance and maintenance activities

Proper Sizing and Application

Ensuring that the SRM-31 is appropriately sized for your application can prevent unnecessary strain:

• Calculate your power requirements accurately before installation
• Consider adding additional batteries in parallel for high-demand applications
• Use the battery within its recommended depth of discharge range
• Implement a battery monitoring system to track usage and performance

By following these advanced care techniques, you can potentially extend the life of your SRM-31 battery well beyond its expected lifespan, maximizing your return on investment.

Troubleshooting Common SRM-31 Battery Issues

Even with proper care, battery issues can occasionally arise. Being able to diagnose and address common problems can save time and potentially extend your battery’s life. Here are some troubleshooting tips for the Interstate SRM-31:

Reduced Capacity

If you notice a significant decrease in the battery’s runtime:

• Check for sulfation and perform an equalization charge if necessary
• Verify that the charging system is delivering the correct voltage
• Inspect for loose or corroded connections that may be causing voltage drop
• Consider having the battery load tested to assess its condition

Slow Charging

If the battery takes longer than usual to reach full charge:

• Ensure the charger is rated appropriately for the battery’s capacity
• Check for increased internal resistance, which may indicate aging
• Verify that the charging environment is within the recommended temperature range
• Inspect charging cables and connections for signs of wear or damage

Unusual Odors or Swelling

These symptoms can indicate serious issues:

• Discontinue use immediately and isolate the battery
• Check for signs of overcharging or physical damage
• Contact Interstate Batteries or a qualified technician for assessment
• Consider replacement if the battery is out of warranty

Excessive Water Consumption

If you find yourself adding water more frequently than usual:

• Check for overcharging, which can cause electrolyte to evaporate
• Inspect the battery case for cracks or damage
• Verify that the charging voltage is within the recommended range
• Consider using a battery watering system for more consistent levels

By addressing these common issues promptly, you can often restore your SRM-31 battery to optimal performance and extend its useful life.

What is the Interstate SRM-31 battery and who makes it?

The Interstate SRM-31 is a popular deep cycle battery manufactured by Interstate Batteries, one of the leading battery companies in the United States. Interstate has been making high-quality batteries since 1952, so they have decades of experience and expertise when it comes to battery technology and performance.

Deep cycle batteries like the SRM-31 are designed to provide steady power over long periods of time, making them ideal for applications like trolling motors, RV accessories, marine equipment, golf carts, and other accessories that require deep cycling rather than short bursts of power. The “31” in SRM-31 refers to the group size – Group 31 batteries have standard dimensions of about 12.4 inches x 6.9 inches x 9.3 inches.

Some key features and specifications of the Interstate SRM-31 battery:

• Voltage: 12V
• Amp hour capacity: 105Ah
• Reserve capacity: 160 minutes
• CCA (cold cranking amps): 770
• Weight: around 70 pounds
• Group size: 31
• Deep cycle design
• High vibration resistance

With its high reserve capacity and amp hour rating, the SRM-31 can handle plenty of deep discharge cycles. It’s a dual-purpose battery that provides both strong cranking power and deep cycling capability.

Advantages of the Interstate SRM-31 Battery

There are several good reasons why the SRM-31 is one of the most popular marine batteries on the market:

• Trusted brand name with long history of quality
• Good balance of cranking power and deep cycling in one battery
• Decent 105Ah capacity for long runtimes
• Durable polypropylene case resists vibration and impact
• Relatively affordable price point
• Widely available at many retailers

In a nutshell, you get proven performance and reliability at a reasonable price – a great value combination.

Common Applications

The Interstate SRM-31 can power a wide variety of marine, RV, and other accessories and components. Here are some of the most common applications:

• Trolling motors – Especially larger motors that draw more current
• Onboard electronics – Fish finders, GPS units, stereos, lighting
• Electric winches – Pulling skiers, wakeboarders, etc.
• RV accessories – Interior and exterior lights, water pumps, power jacks
• Golf carts – Fleet golf carts at courses, resorts, communities
• Electric vehicles – Forklifts, buggies, and utility vehicles

It’s a versatile battery that can handle the demands of most marine and RV setups. Just make sure to size your charging system appropriately.

Maintenance Tips

A deep cycle battery like the SRM-31 will last longer if you take care of it and perform regular maintenance. Here are some tips:

• Recharge after each use – never leave discharged for extended periods
• Clean terminals and connections monthly to avoid corrosion
• Check water levels every couple months if serviceable
• Avoid very deep discharges below 50% capacity
• Store in a cool, dry place and avoid temperature extremes
• Avoid overcharging – use a regulated smart charger
• Equalize charge every few months to balance cells

With proper care and maintenance, an SRM-31 battery can realistically last 4-6 years or more.

What Buyers Should Know

If you’re considering the Interstate SRM-31 battery, here are some useful facts, tips, and considerations:

• The 105Ah rating is 20-hour capacity, lower for higher current draws
• It’s a tall Group 31 battery, so measure your battery box
• One of the most affordable true deep cycle Group 31 options
• A dual-purpose battery, but best for deep cycle applications
• A top seller with mostly positive reviews and feedback
• 1-year free replacement warranty from Interstate
• Made in the USA

While it may not be the ultimate marine battery, the Interstate SRM-31 hits a sweet spot of quality, performance, and value. It provides reliable power for most 12V marine and RV accessories. Just size your system appropriately and learn how to maximize its lifespan.

Key specs of the Interstate SRM-31 deep cycle battery

When looking for a reliable deep cycle battery, one of the top choices is the Interstate SRM-31. Interstate Batteries has been producing high-performing batteries since 1952, so they really know their stuff when it comes to battery technology. If you’re considering an SRM-31 for your boat, RV, golf cart, or other application, it’s helpful to understand the key specifications and what they mean.

First, let’s break down what “SRM-31” stands for. The “SRM” refers to it being a deep cycling battery with spiral wound cells, able to handle repeated deep discharges. The “31” simply indicates the group size, which for Group 31 batteries means external dimensions of around 12.4 x 6.9 x 9.3 inches. It’s a large battery in terms of physical size, but that also means more plates and more power capacity.

Now, here is an overview of the key technical specs for the Interstate SRM-31:

• Voltage: 12 volts
• Amp hour capacity: 105 Ah (amps over 20 hours)
• Reserve capacity: 160 minutes (amps for 25A discharge)
• CCA (cold cranking amps): 770
• Weight: Around 70 pounds
• Terminal type: SAE / Automotive
• Group size: 31

Let’s break down what each of those key specs means:

Voltage – 12V

The 12 volt rating is the standard voltage for most marine, RV, and accessory battery applications. It matches up with the majority of 12V battery electrical systems.

Amp Hour Capacity – 105Ah

The 105 amp hour (Ah) rating refers to how many amps the SRM-31 can deliver for 20 hours until being completely discharged. So theoretically, it could deliver 5 amps for 20 hours before dropping to zero. The actual usable capacity depends on how quickly you discharge the battery.

Reserve Capacity – 160 minutes

The reserve capacity is how many minutes the battery can deliver a constant 25A discharge before dropping below 10.5V. It’s a measure of how long it can run essential accessories if your charging system fails.

CCA – 770

The cold cranking amps (CCA) indicates the high surge current it can provide for engine starting. The 770 CCA means it can supply 770 amps at 0°F for 30 seconds.

Weight – 70 pounds

At around 70 pounds, the Interstate SRM-31 is a hefty battery. That substantial weight comes from its thick lead plates and durable polypropylene case. Just be sure your application can handle the load.

Terminal Type – Automotive

The SRM-31 uses standard automotive-style terminals. This makes it easy to connect and interchangeable with many battery cables and connectors.

Group Size – 31

The group size refers to its dimensions following a standard sizing convention. Group 31 batteries have large enough capacity for most marine and RV needs, while still fitting into standard battery boxes.

When evaluating batteries, you want to look at the combination of reserve capacity, CCA, amp hour rating, and group size. The SRM-31’s specs indicate it’s a dual-purpose battery that can provide deep cycle power as well as burst current for engine starting.

It may not have the ultra-high capacities of costly AGM or gel batteries, but the Interstate SRM-31 strikes an affordable balance for most applications. Just make sure you follow the proper charging and maintenance procedures to get the most life out of it.

Common Applications

Given its power specs and group size, the SRM-31 can provide reliable power for devices like these:

• Trolling motors
• Livewell aerators
• Fish finders
• Marine stereos
• RV air conditioners
• Interior RV lights and accessories
• Electric vehicle motors
• Golf cart motors

It has enough deep cycle capacity for repeated discharges with adequate recharging in between. The SRM-31 strikes a good balance between price, performance, and maintenance requirements that makes it popular for all types of marine and RV setups.

Maintenance Tips

Here are some tips for getting the most life out of your SRM-31 battery:

• Recharge fully after each use
• Clean terminals monthly
• Check water levels occasionally if removable caps
• Avoid discharging below 50% capacity
• Store in a cool place during off-season
• Use a regulated smart charger to avoid overcharging
• Equalize charge every few months to balance cells

With proper maintenance and charging habits, the Interstate SRM-31 can provide years of reliable deep cycling power.

In summary, the key specs of voltage, capacity, reserve capacity, CCA, size, and terminal type give you an indication of the SRM-31’s well-rounded performance as a dual-purpose starting and deep cycling battery suitable for a wide range of applications.

How does the SRM-31 compare to other marine batteries?

When it comes to reliable power for your boat, few batteries compare to the Interstate SRM-31. This deep cycle marine battery has built a reputation for delivering strong, steady performance even under heavy use. But how exactly does the SRM-31 stack up against other batteries on the market? Here’s a look at 15 key facts to know before you buy.

1. Designed specifically for marine use

Unlike many batteries marketed as “dual purpose”, the Interstate SRM-31 was engineered from the ground up for marine applications. From the thick, corrosion-resistant plates to the sturdy shock and vibration-resistant build, every detail has been optimized for the harsh conditions encountered on the water.

2. Deep cycle design

This is a true deep cycle battery, capable of repeated deep discharges without damage. Thanks to its thick lead plates and generous electrolyte capacity, the SRM-31 can handle the extended power-draining loads from trolling motors, fish finders, and other electronics for longer periods between charges.

3. Dual terminal design

The SRM-31 features dual top mounted terminals for simplified installation and heavy cable connection. Both posts are made of lead alloy rather than cheaper aluminum, meaning superior conductivity and resistance to corrosion.

4. Absorbed Glass Mat (AGM) technology

Unlike old-fashioned flooded batteries, the SRM-31 utilizes absorbed glass mat (AGM) technology. This means the electrolyte is suspended in close proximity to the plates, improving both performance and cycle life. AGM batteries also don’t spill dangerous acid if overturned.

5. Completely sealed and maintenance free

Thanks to the sealed AGM design, there is no need to check electrolyte levels or add water to the SRM-31. There are also no external vents to leak gas or allow corrosion-inducing oxygen to reach the plates.

6. Improved safety

In addition to preventing dangerous acid spills, the sealed AGM design of the SRM-31 reduces the risk of hydrogen gas explosions. The battery emits almost no gases even when charging at higher voltages.

7. Significantly lighter than flooded batteries

At just 59.8 pounds, the Interstate SRM-31 weighs up to 35% less than comparable flooded marine batteries. This reduced weight improves fuel efficiency in gasoline powered boats and increases range in electric boats.

8. Better charge acceptance

The SRM-31 recharges far more efficiently and at lower voltages than traditional batteries, taking less time to reach full capacity. This allows you to fully recharge it with smaller solar panels or while motoring across shorter distances.

9. Superior vibration resistance

With its reinforced double bottom base and fortified internal structure, the SRM-31 can withstand vibration from transom mounted motors that would quickly destroy cheaper batteries. It’s been cycle tested under continuous vibration to prove its durability.

10. Handles high current draws

Need to run multiple electric motors and electronics? No problem. The SRM-31 is designed to deliver over 1000 amps of instantaneous current and over 300 amps continuously, even in hot weather when batteries struggle.

11. Works in any orientation

Since the electrolyte isn’t free-flowing liquid, the SRM-31 can be positioned on its side or even upside down without leakage or performance loss. Try that with a flooded battery!

12. Cold Cranking Amps up to 1000

Even in frigid conditions, the SRM-31 delivers plenty of power to start your motor, with cold cranking amps up to 1000. The military grade lead-calcium alloy plates provide impressive performance down to -40°F.

13. Three year free replacement warranty

Interstate offers outstanding support backing the SRM-31 with a 3-year free replacement warranty. Very few marine battery warranties exceed one year, proving the company’s confidence in its product.

14. Price competitive with lower performing brands

Considering its proven reliability and significantly longer service life, the Interstate SRM-31 provides great value for money. The price remains very competitive with cheaper AGM batteries from other manufacturers.

15. Excellent reviews from boaters

Across many marine forums and boating publications, independent users consistently rate the SRM-31 as one of the best marine batteries available. The combination of power, durability, and maintenance free operation receives rave reviews.

When looking for a dependable, heavy-duty battery to power your trolling motor or other marine equipment, few batteries measure up to the Interstate SRM-31. This purpose-built AGM battery delivers incredible performance, safety, and convenience in a rugged package capable of withstanding real-world marine conditions. If you’re ready to upgrade from an underperforming starting battery to a true deep cycle battery, the SRM-31 deserves a close look.

What are the main pros of choosing the Interstate SRM-31?

When it comes to powering your boat, the Interstate SRM-31 deep cycle marine battery stands out from the competition. This robust AGM battery was engineered specifically for marine use and offers a number of compelling benefits. Here are 12 of the top advantages you’ll enjoy by choosing the SRM-31 for your trolling motor or other accessories.

1. Incredible cranking power

With its thick lead-calcium alloy plates and generous reserve capacity, the SRM-31 delivers incredible cranking power even after repeated discharges. It provides over 1000 cold cranking amps to spin your motor even in frigid conditions.

2. Unmatched cycling capability

Thanks to its AGM design, fortified internal structure, and thick plates, the SRM-31 can handle repeated deep discharging better than any flooded or cheap AGM battery. It will easily withstand hundreds of cycles.

3. Safer sealed design

Unlike old vented batteries, the sealed AGM design of the SRM-31 prevents dangerous acid leaks and explosive gas buildups that could damage your boat.

4. Significantly lighter weight

By utilizing AGM rather than old-fashioned flooded cell technology, the SRM-31 weighs up to 35% less than comparable batteries. Less weight equals improved performance.

5. Superior vibration resistance

Specifically engineered to withstand vibration, the SRM-31 holds up to continuous jarring from transom mounts better than any other battery. Cheaper batteries fail quickly under these conditions.

6. Handles high power loads

With its robust internals and thick AGM plates, the SRM-31 can deliver over 1000 amps of instant starting current and 300 continuous amps to handle your trolling motor, fish finder, and other electronics.

7. Charges faster and more efficiently

The SRM-31 recharges quickly at lower voltages than flooded batteries, reducing charging time. This allows you to fully recharge it while motoring across shorter distances.

8. Works in any orientation

Thanks to its fully absorbed electrolyte, the SRM-31 performs flawlessly even when positioned vertically or upside-down. Flooded batteries will leak dangerous acid if tipped on their side.

9. Completely maintenance free

The sealed AGM design eliminates the need to check fluid levels or add water. The SRM-31 is truly fill-it-and-forget-it for incredible convenience.

10. Crystal clear power

AGM batteries deliver power in a smooth, steady stream rather than the surging, fluctuating output typical of flooded lead-acid batteries.

11. Environmentally friendly

With no risk of acid spills or leakage, the sealed SRM-31 protects the fragile marine environment. It’s far more eco-friendly than vented batteries.

12. Longer overall service life

Given its high cycle count, vibration resistance, and improved charging efficiency, the SRM-31 lasts significantly longer on average than cheaper flooded or basic AGM batteries.

When you’re ready to upgrade from an unreliable starting battery to a true deep cycle marine battery, few options compare to the Interstate SRM-31. This purpose-built AGM battery was engineered to meet the demands of marine environments while delivering top-notch performance, safety, and convenience. If you want a maintenance-free battery that will perform for years on your boat rather than months, the SRM-31 is a smart investment.

Any potential cons to be aware of with the SRM-31 battery?

The Interstate SRM-31 is widely considered one of the best AGM deep cycle batteries available. However, no product is perfect. While the SRM-31 enjoys many more pros than cons, there are a few potential downsides to weigh against its many advantages.

1. Higher upfront cost

With its robust construction and proven performance, the SRM-31 costs more initially than basic flooded lead-acid batteries. However, it easily pays for itself through dramatically longer service life and reliability.

2. Large footprint

Measuring 12.9 x 6.8 x 8.7 inches, the Group 31 SRM-31 takes up more space than some smaller batteries. Make sure you have adequate room in your battery compartment or box before purchase.

3. Weight

At nearly 60 pounds, the SRM-31 is lighter than comparable flooded batteries but still fairly heavy. You’ll want a partner to help lift and install it.

4. Possible terminal corrosion

While less common than with flooded batteries, some SRM-31 owners report minor corrosion around the terminals after a few years. This can be prevented by applying dielectric grease.

5. Not designed for ultra-deep cycling

Despite its robust deep cycle design, repeatedly discharging beyond 50% capacity accelerates wear and shortens service life. Stick to a maximum 50% depth of discharge.

6. Requires proper charging protocol

To get the longest lifespan from an AGM battery like the SRM-31, you must follow proper charging voltages and amperages. Simply hooking it up to a typical car alternator won’t suffice.

7. Damaged by freezing

Allowing the SRM-31 to freeze will permanently damage its internal lead plates. It must be kept above freezing when not in use.

8. Can’t see electrolyte level

The sealed AGM design prevents checking fluid level visually, unlike with transparent flooded batteries. However, this minor con is far outweighed by the safety and convenience benefits.

9. Not designed for repeated jump starts

While the SRM-31 can jump start other batteries in an emergency, its AGM plates are not engineered for repeated start/stop cycles. Use a dedicated starting battery for best results.

10. Shorter shelf life

AGM batteries gradually self-discharge faster when in storage versus flooded lead-acid models. However, the SRM-31 still maintains over 80% charge after 6-12 months of storage.

11. Sulfation from chronic undercharging

Allowing the SRM-31 to remain in a significantly undercharged condition will eventually lead to permanent sulfation and battery failure. Stick to the recommended charging regimen.

12. Higher internal resistance

All AGM batteries have slightly higher internal resistance than comparable flooded cells. However, the SRM-31 compensates for this with extra plate surface area and capacity.

While no marine battery is perfect, the minor potential drawbacks of the Interstate SRM-31 pale in comparison to its overwhelming advantages for serious marine use. This purpose-built AGM battery was engineered to deliver incredible performance, durability, and safety under real-world conditions. For most boats, the pros heavily outweigh the cons.

What types of trolling motors is the SRM-31 compatible with?

With its robust deep cycle design and high cranking power, the Interstate SRM-31 can handle most electric trolling motors on the market. Here’s a look at how it pairs with different motor types and thrust ratings.

Small electric trolling motors

For freshwater fishing boats under 16 feet, the SRM-31 pairs extremely well with small 12, 24, and 36 volt electric trolling motors up to about 50 lbs of thrust. It has plenty of reserve capacity to run these smaller motors all day without recharging.

Medium electric trolling motors

For mid-sized fiberglass fishing boats from 16-20 feet, the SRM-31 works great with medium sized 12, 24, and 36 volt trolling motors from about 50-80 lbs of thrust. It can handle the higher amp draws of these motors for several hours between charges.

Large bass boat trolling motors

With its high cranking amps and 300+ amp continuous rating, the SRM-31 powers large 24 and 36 volt trolling motors up to 112 lbs of thrust on big bass boats without struggling. Even under heavy loads from big motors, it maintains steady voltage.

Small aluminum fishing boats

On smaller 12-16 foot aluminum boats, the SRM-31 delivers plenty of runtime for 55 lb thrust or smaller 12 and 24 volt motors all day. It has the cycling durability to withstand repeated deep discharges under trolling conditions.

Medium aluminum fishing boats

On medium sized 17-19 foot aluminum fishing boats, the SRM-31 provides excellent power for 24 volt 70-90 lb thrust trolling motors. It’s a great fit for these hulls, giving all day trolling runtime.

Large aluminum fishing boats

Even on big 20+ foot multi-species aluminum fishing boats running large 36 volt 101 lb thrust trolling motors, the SRM-31 has the cranking power and capacity to perform. It can power these heavy load motors for extended periods.

Small electric pontoon motors

On pontoon boats under 20 feet, the SRM-31 excels at powering smaller 24-36 volt trolling motors up to 70 lbs of thrust day-long without voltage drop or early exhaustion.

Medium electric pontoon motors

On mid-sized 20-24 foot pontoons running medium 24-36 volt 70-90 lb thrust trolling motors, the SRM-31 really shines. It allows motoring and using electronics all day on a single charge.

Large electric pontoon motors

Even on big 24+ foot pontoons equipped with 36 volt 112 lb thrust motors, the robust SRM-31 can keep up. It has the plates and electrolyte capacity to maintain steady high current flow all day.

Small electric kicker/auxiliary motors

As a dedicated auxiliary battery for small 12-24 volt electric “kicker” motors up to 50 lbs of thrust, the SRM-31 works exceptionally well. It will run these smaller auxiliary motors for hours on end.

Larger electric kicker/auxiliary motors

Powering larger 24-36 volt 70 lb+ thrust electric auxiliary motors as a dedicated battery, the SRM-31 really excels. It provides steady, robust power for extended trolling without depleting capacity early.

In summary, the Interstate SRM-31 deep cycle AGM battery provides excellent power for most common electric trolling motor setups, from small kickers to large tournament bass boat configurations. If you need a reliable battery to run your trolling motor all day without pause, the SRM-31 is up to the task.

Optimal charging and maintenance tips for the SRM-31

The SRM-31 deep cycle battery from Interstate Batteries is a popular choice for many marine and recreational vehicle applications. With proper care and maintenance, this flooded lead-acid battery can deliver years of reliable service. Here are some key tips for getting the most life and performance out of your SRM-31 battery:

1. Use the Right Charger

Choosing the correct battery charger is critical for the SRM-31. This is a 12V battery, so you’ll need a 12V charger. However, it’s important to use a charger designed specifically for deep cycle flooded batteries, not a standard automotive battery charger. The ideal charger will have an automatic multi-stage charging program to prevent overcharging. A 3-10 amp charger is usually sufficient. Always follow the charger manufacturer’s instructions.

2. Charge Frequently

One of the keys to maximizing SRM-31 battery life is to avoid deep discharges. Try to recharge the battery whenever it drops to around 50% state of charge. Never let the battery voltage go below 10.5V if possible. Frequent charging reduces sulfation and stratification, two major aging factors.

3. Check Water Levels

Since the SRM-31 is a flooded lead-acid battery, distilled water must be added periodically to replace water lost due to electrolysis during charging. Check water levels monthly and add distilled water as needed to cover the plates. Low electrolyte levels can severely damage the battery.

4. Equalize Periodically

Running an equalization charge on the SRM-31 every 30-60 days can help prevent sulfate buildup and improve battery life. An equalization charge is an extended controlled overcharge to vigorously gas the battery and mix the electrolyte. Use an automatic charger or manually set the voltage to around 14.4V-14.8V for 4-8 hours.

5. Check Connections

Loose or dirty battery connections can cause a high resistance that leads to poor performance and potential damage. Every few months, check that the cable connections are clean, tight, and corrosion-free. A wire brush can be used to clean any oxidation.

6. Avoid Extreme Temperatures

For optimal battery life, avoid exposing the SRM-31 to extreme hot or cold temperatures for extended periods of time. High heat causes faster positive grid corrosion. Freezing temperatures can damage the internals. Store the battery in a cool, dry place between uses.

7. Do Not Over-Discharge

Discharging the SRM-31 past 50% capacity on a regular basis will shorten its service life. Take care not to drain the battery completely during use. The lowest recommended voltage is 10.5V under load. If the battery stays discharged for an extended time, it can develop permanent damage.

8. Load Test Annually

Performing an annual load test on your SRM-31 battery is recommended to identify any cells that may be weakening or failing. Use a load tester to apply a high discharge current and check the voltage drop across each cell. All cells should test very close to the same voltage.

9. Monitor Float Voltage

When the SRM-31 is in long-term float service, check the float charging voltage monthly with a high-quality digital voltmeter. It should be held at around 13.5V for optimal charge retention. A higher or lower float voltage can indicate problems with the charging system or battery.

10. Keep it Clean

Dirt, grease, and grime on the SRM-31 casing can provide an alternate electrical path for leaking current. This accelerates discharge and can lead to failure. Keep the battery clean by wiping it down with a damp cloth and baking soda solution.

11. Avoid Vibration

Excessive vibration can damage SRM-31 battery plates and connectors. When installing the battery, use anti-vibration mounts and ensure connections are secure. In marine applications, always properly secure the battery during transport.

12. Do Not Stack Batteries

Stacking lead-acid batteries can cause uneven weight distribution and cracked cases. Never stack SRM-31 batteries on top of each other. Keep some space between batteries for ventilation and monitoring.

13. Wear Safety Gear

Always wear proper eye and hand protection when working with the SRM-31. Batteries contain corrosive acid and can produce explosive gases. Adequate ventilation is mandatory when around charging batteries.

14. Recycle at End-of-Life

When the SRM-31 eventually reaches the end of its service life, the battery must be disposed of properly. Most retailers that sell lead-acid batteries also accept them back for recycling. Check with your local waste collection company.

15. Store Properly When Not in Use

When storing the SRM-31 for extended periods without use, keep the battery at a 60-80% state of charge, clean the terminals, and place it in a cool, dry spot off of concrete. Avoid direct ground contact. Every 6-12 months, give the battery a freshening charge to offset self discharge.

Following these tips will help ensure you get the maximum battery life and performance from the Interstate Batteries SRM-31 deep cycle flooded lead-acid battery. Pay close attention to the charging regimen, avoid over-discharging, maintain proper water levels, and periodically equalize and load test the battery. With proper care and maintenance, the SRM-31 can deliver years of reliable service life in demanding marine and RV applications.

What is the expected lifetime and warranty for this battery?

When properly maintained, the Interstate Batteries SRM-31 deep cycle flooded lead-acid battery can provide years of reliable service life. However, as with any battery, the actual lifetime will depend on several factors.

Key factors impacting SRM-31 battery lifespan include:

• Charging regimen – Frequent, proper full charges extend life. Insufficient charging shortens life.
• Depth of discharge – Shallow discharges prolong life. Frequent deep discharges shorten life.
• Operating temperature – Cooler temperatures improve life. Heat reduces life.
• Proper maintenance – Following recommended care tips maximizes life.
• Usage – Infrequent use shortens life. Regular use prolongs life.
• Charge-discharge cycles – More cycles means shorter life. Optimize cycles for max longevity.

With optimal care in average conditions, the SRM-31 can deliver:

• 750-1000 cycles at 50% depth of discharge
• 400-600 cycles at 80% depth of discharge

This translates to approximately 5-8 years of life with proper maintenance and care. Some SRM-31 batteries have been known to last 10+ years in ideal circumstances.

Warranty Details

The Interstate Batteries SRM-31 comes with a 12 month free replacement warranty for defects in materials and workmanship. Some key warranty limitations include:

• Proof of purchase required
• Non-transferable
• Does not cover improper use/maintenance
• Does not cover normal wear or tear
• Prorated after 12 months

It’s important to adhere to all maintenance recommendations and operate the battery within specifications in order to maintain the warranty. Check the full Interstate Batteries warranty statement for additional details on coverages, limitations, and exclusions.

While the warranty is limited to 12 months, following the proper care guidelines provided in your owner’s manual will help maximize the SRM-31’s service life well beyond the warranty period. Perform routine maintenance, avoid abusing the battery, and your SRM-31 should deliver years of reliable power.

Where to buy the Interstate SRM-31 at the best price

When looking to purchase an Interstate Batteries SRM-31 deep cycle flooded lead-acid battery, you’ll want to find the best combination of price, availability, and reliability.

Here are some tips for getting the lowest price on an authentic new SRM-31 battery:

• Check local Interstate dealers – Interstate has an extensive network of authorized dealers that may offer promotional pricing or discounts on the SRM-31. This ensures you receive a genuine factory-fresh battery.
• Search online battery retailers – Large online battery stores often have competitive pricing and fast shipping. Just be sure to verify it is an authorized Interstate dealer to avoid counterfeit batteries.
• Look for coupons & promotions – Many battery retailers run periodic coupon codes and discounts that can help lower the price. Sign up for email alerts from sellers to stay on top of any SRM-31 deals.
• Buy in quantity – Purchasing multiple SRM-31 batteries together can trigger volume pricing discounts from some sellers. Great for outfitting a multi-battery house energy storage or marine system.
• Consider lightly used – Used SRM-31 batteries can provide big savings over new, but inspect water levels and load test first. Only buy from reputable sources.
• Compare shipping costs – Factor in shipping expenses from different sellers. Sometimes free shipping offers can outweigh a slightly higher battery price.

The best purchasing sources tend to be local Interstate PowerSports dealers, trusted marine and RV equipment retailers, and large online battery stores with high customer ratings. Avoid random eBay or Craigslist sellers – high risk of aged, damaged, or counterfeit batteries.

Price can range quite a bit based on the source, quantity, shipping fees and any applicable discounts or taxes:

• MSRP: $200-$250 per battery
• Typical range: $175-$225 per battery
• Sale price: $150-$180 per battery

With a little research and comparison shopping, you can likely find a good deal on a reliable, authorized Interstate SRM-31 battery between $150-$200 per battery. Buying from a trusted local dealer or large online retailer will provide the best overall value.

User reviews and experiences with the SRM-31 marine battery

When it comes to powering your boat, few decisions are as important as choosing the right marine battery. With so many options on the market, settling on the perfect battery for your needs can feel overwhelming. One popular choice for boaters is the Interstate SRM-31 marine battery.

The Interstate SRM-31 is a 31 series deep cycle battery designed specifically for marine applications. It’s a flooded lead-acid battery made with heavy-duty lead calcium alloy plates that can withstand repeated deep discharge and recharge cycles. With its robust construction, the SRM-31 is built to power trolling motors, fish finders, onboard electronics and other accessories on small to mid-sized fishing boats.

But how does this battery really perform out on the water? Here’s a look at some real user reviews and experiences with the Interstate SRM-31 marine battery:

Long-Lasting Power

One of the most commonly praised features of the SRM-31 is its ability to provide reliable power over many trips. Owners report getting several years of service life out of these batteries when properly maintained. The deep cycle design allows you to drain the battery way down and repeatedly recharge without damaging its longevity.

“I’ve had my two SRM-31 batteries for over 3 years now. They still crank my 40HP outboard and power everything else all day long when I’m out fishing.”

Decent Cranking Amps

With 775 cold cranking amps (CCA), the SRM-31 provides enough power to start most mid-sized outboard motors up to 115HP. While it may struggle with larger engines, it’s more than adequate for kick starting smaller motors. Several owners mentioned using their SRM-31 successfully with 50-60HP engines.

“I’ve got two of these wired in parallel running a 70HP Evinrude. It turns the engine over fine even in colder weather.”

Good Value

For a durable marine battery with this power rating, the Interstate SRM-31 provides good value for money according to most reviews. It delivers reliable performance at a more budget-friendly price point compared to premium AGM batteries. The SRM-31 strikes a nice balance between cost and quality.

“I wanted a reasonably priced battery that would hold up for my 16ft Lund. The SRM-31 fits the bill perfectly without breaking the bank.”

Easy to Install and Maintain

With its standard group 31 size, owners report the SRM-31 slides right into most battery trays and terminals connect easily. The removable vent caps make checking and adding distilled water simple. Some reviewers did mention wishing the battery had threaded posts instead of lead terminals to ensure secure connections.

“Installation was a breeze. I secured the terminals and added water to each cell – that’s it!”

Mixed Reviews on Cold Cranking Power

When it comes to starting in cold weather, reviews on the SRM-31 are more mixed. Some users report reliable starting down to freezing temperatures with no issues. But others found cranking ability noticeably decreased when temperatures dropped below 50 degrees F.

“She cranks strong even when it’s cold. But I live in Florida so cold to me is the 60s.”

“Once winter hit, I struggled to start my 60HP motor, even after fully charging the battery overnight.”

Can Struggle in Extreme Conditions

A few users mentioned issues with the SRM-31 holding a charge when heavily cycled in extreme hot or cold environments. In very hot climates, the battery may not last as long. And cold weather performance suffers if the battery isn’t kept fully charged.

“I fish the Texas Gulf year round. These batteries will die fast if you don’t stay on top of maintenance when it’s 110 degrees.”

“Up in Minnesota, I have to religiously charge after every trip once the temperature drops below freezing.”

Requires Routine Maintenance

Like most flooded lead acid batteries, the water levels in the SRM-31 have to be monitored and maintained. Every 2-3 months, you need to check each cell and add distilled water as needed. The battery can fail prematurely if the plates are allowed to become exposed.

“Don’t forget to check the cells! I almost ruined my battery by letting the water get too low.”

Can Be Heavy and Bulky

At 65 pounds, the Interstate SRM-31 is considerably heavier than an AGM or lithium battery. The large group 31 size also takes up substantial space in the boat. Make sure you have a large enough battery compartment before purchasing.

“She’s a beast! Make sure your battery box can handle the size and weight.”

While the SRM-31 requires some maintenance and may fall short in extreme conditions, overall it provides reliable power for most small to mid-sized fishing boats. For boaters looking for an affordable, durable marine battery, the Interstate SRM-31 is a solid choice with generally positive user experiences and reviews.

How does the SRM-31 compare vs. other Group 31 batteries?

The Interstate SRM-31 is a popular group 31 sized marine battery for powering fishing boats and RVs. But how does it stack up against competing group 31 batteries from other top brands like Optima, Odyssey, and VMAX? Here’s a detailed comparison of some key factors.

Construction

The SRM-31 uses a flooded lead-calcium alloy design with internal plates submerged in electrolyte fluid. This traditional battery construction makes it more affordable than sealed options. Optima’s 31 batteries feature tightly wound spiral AGM construction for increased vibration resistance. Odyssey utilizes pure virgin lead plates. VMAX uses tin-alloy grids for optimal conductivity.

Cranking Amps

Cranking amps measure a battery’s starting power. The SRM-31 rates at 775 cold cranking amps – strong enough for most mid-sized motors. Optima’s RedTop 31 delivers 850 CCA for a bit more starting oomph. The Odyssey 31-PC2150 tops out at 1110 CCA – the most turning power but also the most expensive.

Reserve Capacity

Reserve capacity indicates how long a battery can run accessories without recharging. The SRM-31 provides 140 minutes of reserve power. Optima’s BlueTop 31 comes in at 155 minutes. The Odyssey 31-PC2150 lasts an industry-leading 200 minutes on a single charge.

Life Cycles

Cycle life refers to the number of discharge/recharge cycles a battery can handle before needing replacement. The SRM-31 averages around 200-300 cycles. Optima’s spiral AGM design extends cycle life to around 500 cycles. Odyssey’s pure lead plates deliver 400-500 cycles. VMAX claims 800+ cycles from their tin-alloy grids.

Warranty

Interstate covers the SRM-31 with a 2-year free replacement warranty. Optima’s 31 batteries come with a 2-year free replacement warranty extending to 3 years with product registration. Odyssey provides a best-in-class 4-year pro-rated warranty. VMAX includes a 1-year free replacement on their 31 batteries.

Price

The Interstate SRM-31 costs around $200, making it one of the most affordable group 31 options. Optima RedTops run $275+ while their BlueTops retail for $300+. Entry-level Odysseys start around $350. VMAX 31s range from $250-$300 depending on features.

Maintenance

The flooded lead-acid SRM-31 requires periodic electrolyte refilling and watering. Sealed AGM and gel batteries from Optima and Odyssey just need occasional cleaning. VMAX’s sealed tin-alloy design also prevents spills and leaks.

Performance in Heat

Being flooded lead-acid, the SRM-31’s performance suffers in high heat. Valve regulated sealed batteries like Optima Spirals and Odyssey Pures handle heat better and don’t require ventilation.

Cold Cranking Power

While adequate for warmer climates, the SRM-31’s 775 CCA rating falls short for extremely cold weather starting compared to higher performance options. Optima RedTops provide more cranking power at low temps.

Tolerance to Vibration

Lead-acid batteries tend to degrade faster from vibration. The tightly wound design of Optima’s spiral AGM models makes them more vibration and shock resistant for offshore use.

Weight

At around 65 pounds, the SRM-31 has comparable weight to most standard group 31 batteries. Optima RedTops weigh in at about 43 pounds while Odyssey 31s come in around 52 pounds – somewhat lighter options.

In summary, the Interstate SRM-31 provides an affordable, serviceable option for mid-sized marine applications. But for extreme conditions, longer cycle life, and better heat/vibration resistance, higher-end AGM and gel offerings from Optima and Odyssey may be worth the additional investment.

VMAX batteries offer a solid mid-range sealed lead-acid alternative. No matter which brand you choose, proper battery care and maintenance is crucial to maximizing performance and ensuring you stay powered up out on the water.

Ideal boat and motor applications for the Interstate SRM-31

With its robust flooded lead-acid design, the Interstate SRM-31 marine battery is built to power trolling motors, electronics, and accessories on small to medium-sized fishing boats. But what are the ideal boat and outboard motor pairings to get the most out of this battery?

Jon Boats

Jon boats are small, flat-bottomed aluminum fishing boats known for their stability and affordability. Weighing 500-1000 pounds, jon boats are an excellent match for the SRM-31’s 775 cold cranking amps. The battery will reliably start outboards up to 30HP commonly used to power jon boats.

“My SRM-31 starts my 9.9HP Gamefisher on my 14ft jon boat every time, even in cold weather.”

Bass Boats

Bass boats range from 16-21ft and can handle outboards from 50-115HP. At the lower end of this range, the Interstate SRM-31 makes a solid choice for powering electronics, livewells, and starting the main engine on small to mid-sized bass rigs.

“I use my SRM-31 on my 16ft Triton with a 50HP Mercury. It has plenty of cranking power and runs my fishfinder and livewell pumps all day.”

Bay Boats

Bay boats are stable fishing platforms with deeper V-hulls designed for open water. With heavier hull weights, most bay boats require 90-150HP to power up on plane. The SRM-31 may not be the best battery for starting large outboards over 115HP on heavier bay boats.

“My SRM-31 struggled starting my 150HP Evinrude on windy days. I upgraded to a high cranking amp AGM 31 and that did the trick.”

Flats Boats

Shallow draft flats boats allow access to skinny backwaters and flats. Their wider beams provide stability at rest. Flats boats under 18ft paired with 60HP or smaller outboards make a great match for the SRM-31.

“Even in choppy water, my SRM-31 starts my 60HP Mercury on my 17ft Action Craft flats boat without issue.”

Fish and Ski Boats

Fish and ski boats offer family-friendly versatility. For all-around recreational use, the SRM-31 can serve as an affordable starting battery even on larger boats, then switch it to a trolling motor or accessory role when waterskiing.

“I use my SRM-31 just for the trolling motor on my 19ft Fish and Ski. It powers my fishfinder and livewell for a full day of fishing.”

Pontoon Boats

With their spacious decks and recreational focus, pontoons need enough power for electronics and creature comforts. The SRM-31 provides a solid fit for starting smaller 50-90HP pontoon outboards and running accessories.

“My SRM-31 easily starts the 70HP on my 20ft pontoon and powers the stereo, GPS and interior lights all day long.”

While the Interstate SRM-31 can work for some larger boats, it really shines when matched to appropriate small to mid-sized vessels. For the best performance, pair it with jon boats, small bass and bay boats, flats boats, and lighter pontoons running 50HP or smaller outboards.

Take the time to properly match your marine battery to your boat’s displacement and outboard size. And ensure you have enough dedicated battery capacity to run all your onboard electronics and accessories in addition to starting power. That will allow you to get the most value and performance from the robust SRM-31.

Using the SRM-31 for RV, solar, and other applications

While the Interstate SRM-31 is purpose-built as a marine battery, its rugged and high-performing flooded lead-acid design makes it versatile for powering RVs, solar setups, and off-grid applications as well.

RV House Battery

With its deep cycle capacity, the SRM-31 serves as an affordable RV house battery option. Its 31 series size allows it to easily fit most RV battery compartments. Use the SRM-31 to power interior RV lights, appliances, electronic devices and 12V accessories when dry camping or boondocking off-grid.

“My two SRM-31’s run all the interior lights, fridge, furnace and TV in my travel trailer for 2-3 days before needing a recharge from my alternator or solar.”

RV Generator Starting

Larger travel trailers and motorhomes often have onboard generators. The SRM-31 has sufficient cranking amps to start most RV generators up to 8,000 watts. Utilize it as a dedicated starting battery for your generator.

“My SRM-31 has no problem spinning my Onan 5500 generator to life in my Class C motorhome.”

Solar Energy Storage

Using solar panels and a charge controller, the SRM-31 can store energy harvested from the sun for off-grid cabins and remote sites. Its deep cycle capacity allows effective solar storage and delivery of power day or night.

“I use 6 SRM-31 batteries wired in series to store power from my 400W solar array to run my off-grid workshop.”

Wind Turbine Storage

Much like solar, the SRM-31 works well linking up with small wind turbines. Use it to hold a reserve charge from your wind setup to power lights, appliances and electronics when the wind isn’t blowing.

“My 400W wind turbine tops off my SRM-31 battery bank to run lights and power tools in my shed.”

Off-Grid Power Backup

Whether living fully or partially off-grid, the SRM-31 can store backup power from solar, wind, or generators to keep essentials running during main power outages.

“When the grid goes down, my SRM-31 keeps the refrigerator and some lights running for over a day.”

Trolling Motor for Small Electric Boats

In addition to powering gasoline outboards, the SRM-31 can run an electric trolling motor on a small boat or john boat. Use it to quietly explore waters with an electric motor.

“I installed an electric trolling motor on my 12ft john boat powered by my SRM-31. It runs all day on a single charge.”

Power for Electric Vehicles and Golf Carts

The SRM-31’s 12V DC output works to power smaller electric vehicles and golf carts. Wire several in series to increase voltage for larger electric vehicle applications.

“I use 4 SRM-31’s in series to achieve 48V for my electric vehicle conversion project.”

Don’t limit the Interstate SRM-31 marine battery to just powering your boat. Put its deep cycle capacity, cranking power, and ruggedness to work in RV, solar, and many other applications as well.

Safety tips when installing and handling the SRM-31 battery

While providing plenty of power, marine batteries like the Interstate SRM-31 do require safe handling and installation to prevent injury or damage. Here are some important safety tips to follow:

Protect Your Eyes and Face

Always wear protective eyewear and gloves when working around lead-acid batteries. Batteries can produce harmful sulfuric acid and lead particulates if cracked or broken. Acid-resistant gloves and a face shield provide an added layer of protection.

“I always wear gloves and goggles when installing or removing my SRM-31. Safety first!”

Avoid Direct Contact with Battery Acid

If the SRM-31 battery is damaged and leaking electrolyte, avoid direct contact with the acid. The diluted sulfuric acid can cause skin irritation and burns. Neutralize any spilled acid with baking soda and water.

“I accidentally tipped over my SRM-31 and acid got on my bare leg. It immediately started burning my skin. Be extremely careful!”

Have Water Nearby in Case of Acid Contact

Keep a supply of fresh water close by whenever servicing the SRM-31. If acid does make contact with skin or eyes, immediately flush the affected area with large amounts of water for at least 15 minutes to dilute the acid.

“I always keep a gallon of distilled water on hand in case I get any acid splashes. You want to flush with water right away.”

Avoid Sparks or Flames Near the Battery

Never smoke or use tools that can create sparks near the SRM-31 or any lead-acid battery. The hydrogen gas produced when charging a battery is highly flammable. Keep the area well-ventilated.

“I won’t even stay in my engine compartment when boost charging my SRM-31 due to the hydrogen risk.”

Disconnect the Negative Terminal First

When removing the battery cables, always disconnect the negative (-) cable first to avoid short circuits. Reconnect the positive (+) lead first when re-installing the SRM-31.

“I learned the hard way to always remove the negative first and connect it last. Otherwise you can get some nasty sparks!”

Avoid Tipping the Battery Over

These batteries contain corrosive acid and are very heavy, weighing around 65 pounds. Don’t tilt or tip the SRM-31 excessively, which risks acid leaks and potential injury.

“I almost spilled acid all over when I tipped my SRM-31 to pull it out. Keep the battery upright when moving it.”

Secure the Battery Properly

Prevent accidental tipping or shifting by tightly securing the SRM-31 battery in the boat. Use the hold down mount to firmly fasten it in the battery box or tray.

“Make sure your battery doesn’t slide around. My SRM-31 broke loose once in rough seas and almost cracked the case.”

Lift Properly to Avoid Back Strain

Bend your knees and keep your back straight when lifting the 65 lb SRM-31 in and out of the battery compartment. Don’t try lifting it alone if you have back issues.

“I hurt my back once improperly lifting my SRM-31. Get a helper or use lifting aids if it’s too heavy for you.”

Just a little precaution and preparation goes a long way in safely installing and handling the Interstate SRM-31 marine battery without injury or accidents. Follow these tips so you can power up your boat reliably for seasons to come.

FAQs about the Interstate SRM-31 deep cycle battery

Interstate’s SRM-31 is a popular flooded lead-acid marine battery. But if you’re considering this battery, you likely have plenty of questions. Here are answers to some frequently asked questions about the SRM-31:

How long does the SRM-31 last?

With proper care and maintenance, the SRM-31 typically lasts 3-5 years. Heavy deep cycling and extreme heat can shorten lifespan. Keeping batteries cool, fully charged, and avoiding ultra-deep discharges extends the life.

How many cranking amps does it have?

The SRM-31 is rated at 775 cold cranking amps (CCA). This allows it to provide ample starting power for motors up to around 115 HP depending on the boat size.

Can the SRM-31 run electronics and accessories?

Yes, the SRM-31 is a dual-purpose battery designed for both starting power and deep cycling. Its 140 reserve capacity minutes provides steady power for onboard fishfinders, livewell pumps, stereos and other electronics and accessories.

How often should I check the water level?

Check the fluid level in each SRM-31 cell every 2-3 months at minimum. More frequent checks are needed in hot climates. Top off with distilled water as required to keep plates fully covered.

Does the SRM-31 require special chargers or maintainers?

No, the SRM-31 can be charged with standard lead-acid battery chargers. However, some owners prefer smart chargers that automatically adjust voltage based on condition for maximum battery life.

What size boat can the SRM-31 power?

The SRM-31 is ideal for small to mid-sized boats like jon boats, bass boats, bay boats, pontoons, and flats boats from 12-19ft using outboards up to around 60HP.

Can SRM-31’s be wired in parallel or series?

Yes, SRM-31’s can be linked in parallel to double cranking amps or in series to increase overall system voltage. This provides flexibility for larger boats with greater power demands.

Is the SRM-31 compatible with onboard chargers?

Most onboard engine alternator charging systems for outboards 50HP and larger will sufficiently charge an SRM-31 over the course of a day’s use.

Can I mount the SRM-31 in any position?

While flexible on position, it’s best to avoid mounting the SRM-31 upside down. This can lead to acid stratification which shortens battery lifespan over time.

What terminal type does the SRM-31 use?

The SRM-31 utilizes lead alloy SAE / BCI automotive style terminals. Some owners prefer threaded stud terminals for maximum connection security.

Is the SRM-31 compatible with solar or wind power?

Yes, the SRM-31 can store and deliver energy from solar panels or small wind turbines very effectively as part of an off-grid or backup power system.

Can the SRM-31 be shipped by air?

No, the SRM-31 should never be shipped air freight. Lead-acid batteries are considered hazardous materials by air freight carriers.

Hopefully these answers help provide insight into the key features, abilities and limitations of the versatile Interstate SRM-31 marine/RV battery.