A dual-purpose trolling motor battery has two functions – starting and deep cycling the motor. One of those minor drawbacks is that they usually cost 36V lifepo4 battery more than their wet cell and AGM counterparts. Another is that they are sensitive to overcharging and require a charger that is suitable for gel cell batteries to prevent premature failure or damage. They cost almost double wet cells, although their improved performance and better lifespan mean they still offer great value for money. They do need a bit of maintenance though, namely refilling water levels and checking for corrosion, and are typically heavier than most other batteries.

Combo Pack – 36 Volt 100 Ah Deep Cycle Battery & Charger

We recommend using at least a 100 ampere-hour rating, group 27 rating, and 175 minutes of RC(Reserve Capacity). Here is a table for you to pick the right trolling motor battery according to the size and the voltage or Amp/ hour. Note that the Optima isn’t rated by amp hours, as the spiral cell technology involved doesn’t carry over to this conversion method. Rest assured, the Optima will outlast any regular plated battery in its own class.

Another thing you should care about the boat trolling motor battery is its group number. Oftentimes you’ll see the trolling motor battery marked with group 24, 27, 31, and etc. If you don’t want to replace the trolling motor batteries every year or every a few years, choose a good quality AGM battery which can last around 4 years, no maintenance needed. Having decided on the best type of battery for trolling motor, your next move would be selecting one that can perfectly fit your boating needs with enough power but not overkill.

The Best Marine Batteries Of 2025

The better your maintenance, the longer your battery will perform. The amperage hour (Ah) rating is a measure of the capacity of a battery. It represents the electrical charge a battery can deliver over a particular time. For example, a battery with a 100 Amp-hour rating can deliver a current of 1 ampere for 100 hours or 10 amperes for 10 hours before the battery discharges.

I ran the Walmart Everstart Batteries for more than a decade without a single problem. I had 3 of those 29 series Deep Cycle batteries last me more than 5 years. The fact that you can pay roughly $100 and get a battery to power your stuff for 5 years is a pretty darn good deal in my opinion.

Indeed, if I were running a Jon-boat or small aluminum boat for which added battery weight was an issue, the SRM-27 would be on the top of my list. Long trusted by anglers and battery experts alike, Interstate Batteries’ SRM series are consistently solid performers, delivering the power you need from dawn to dusk. And while certainly not high-tech, these batteries have a well-earned reputation for reliable performance. Trolling motor enthusiasts love this battery for its lightweight and pretty good power options.

People say that the battery is great in hot weather and can go a long time between charges. Reviewers claim to get as long as six years out of their Optima Batteries. People also say that these batteries are great for storage because they have a low self-discharge rate, so even after long periods of non-use, they still keep a charge. If you do not have the right battery, you may not have enough power to turn the motor over, and you could find yourself stuck out on the water. Charge your batteries immediately after use, and keep them plugged into the appropriate charger until they are 100 percent charged.

The price is also a point of issue with this battery, but you get what you pay for. Reviewers also have good things to say about the customer service from the manufacturer. If there is an issue, the customer service department at Duracell is great at handling the issue and resolving it quickly. This battery delivers a continually strong CCA and always turns over quickly.

Northstar batteries are known to be very popular for fishing boats. The pure lead AGM design is made in Missouri and is durable and resistant to heat. One reviewer said that they ran the battery for six hours and it took 10 hours to fully recharge.

So the mat not only protects the battery from leaking, but it also extends the lifespan of the battery. With that said, here are some of the best trolling motor batteries you can buy. Their service is some of the fastest and preventative in the industry. Their app checks for potential problems on a constant basis with the battery. The app will report a slight degradation in any cell, so you can file a claim and get a replacement quickly BEFORE YOUR BATTERY DIES.

It provides an Amperage of 100Ah, and this is a 4000+ Cycles Rechargeable Battery, which is a great option for marine activities. It is slightly heavy but other than that, the amperage is 120 Ah, along with a voltage of 12 volts. This trolling motor battery uses the Absorbent Glass Mat (AGM) technology and a valve fixed design. This can be utilized to enclose and indoor conditions without leakage or heavy maintenance. Dual-purpose batteries deliver powerful cranking amperage for smooth and easy starting of the motor and have a low amp draw service.

Lithium batteries are the darlings of the boating world and also the villains. When working properly, they deliver max power for long periods of time in a package that weighs about a third of their AGM counterparts. On the flip side, they’re quite expensive, and some have suffered through random shutdowns. So when I decided to invest in three Pro-Guide Lithiums for my new boat, I was wary but the weight and performance benefits won out.

Pound-for-pound, lithium marine batteries have more energy capacity than lead-acid batteries. That means, along with any other benefit from a high-powered battery, it’s lighter than a pack of lead-acid batteries. You can carry more equipment without worrying about how much weight and space it takes to power it all.

Unless you have a high-end motor then you’ll probably have a 12V motor, so most trolling motor batteries have a suitable voltage to power your motor. Actually, ODYSSEY manufactures its batteries out of two plants – one in Missouri and the other in Wales in the UK. Durability is important for any trolling motor battery and this model has it in spades. Being an AGM battery means it’s completely sealed so it won’t leak while being more resistant to vibrations.

Costing less than the others on our list, this 12V 35Ah deep cycle battery offers everything you could want for a smaller trolling motor and boat without breaking the bank. As a deep-cycle battery for trolling motors, it offers a long-lasting source of power, typically providing several hours’ worth on a single charge. When going at lower speeds you can expect capacity to remain high, with only the longest trips reducing it to below 50%.