Deep Cycle Battery

Best Deep Cycle Battery for Trolling Motor and Buying Guide

Fishing Gear

A trolling motor is quite useful on a boat as it eliminates the need to paddle around. You have the freedom to move at varying speeds so that you can catch the fish.

Unfortunately, it is virtually useless without a trolling motor battery makes it easy for you to move on the water for hours and even power the gadgets you have on board.

This post seeks to help you choose the best deep cycle battery for trolling motor. Compared to ordinary truck or car batteries, the right deep cycle battery for your boat offers beastly power backup. You can depend on it to last a long time and do more than just kick start the engine.

Unfortunately, incredible performance also means that trolling motor batteries are susceptible to constant discharge over a long time.

They perform much better compared to regular batteries and are far more superior when it comes to toughness, preservation, and efficiency. This is why investing only in the best is recommended.

Best Deep Cycle Battery for Trolling Motor

12V 55Ah Power Boat Pontoon Electric Trolling Motor Deep Cycle Battery

Designed to deliver maximum power, the Mighty Max ML55-12 is a great investment for someone who isn’t keen on traveling at the lowest speeds. This is a 55Ah AGM battery that boasts a state of the art, heavy-duty, calcium-alloy grid that delivers exceptional performance.

It is an upgrade of the older 35Ah battery that will prove a pleasant surprise for anyone with a 30-lb thrust throttling motor. You don’t have to worry about the battery running out quickly as this model allows for up to 4 hours of service at full speed and 6 hours at medium speed.

Even though it is bigger than the 35Ah, there isn’t much difference in size between the two. The ML55-12 measures 9.02″x5.43″x9.13″ and if the height is a problem, you can always place it on the side.

You don’t have to worry about water damage as it is spill proof and can be set at any angle. It weighs 38.6 pounds, which is only 14 pounds heavier than the 35Ah.

The ML55-42 comes with the popular features that similar trolling motor batteries by Mighty Max are known for. These include ability to withstand shocks and vibrations as well as maintenance.

Its valve regulated design allows for use in open and enclosed environments for applications like emergency lighting, golf carts, electric vehicles, power sports and more.


  • More time in the water at fast speeds
  • You can set it at any angle depending on the application
  • Highly resistant to vibrations and shock
  • Long lasting in extreme temperatures


  • Takes up to 30 hours to recharge if fully drained

Optima Batteries 8016-103 D34M Blue Top Deep Cycle Marine Battery

The 8016-103 D34 is a dual-purpose battery designed with Spiral Cell Technology. It boasts ultra high performance capabilities that prove useful for starting as well as deep cycle applications.

The Spiral Cell Technology, rugged construction and Absorbed Glass Mart (AGM) plates work together to ensure that you can stay on water for longer periods of time.

The electrolyte between the two plates is packed like a sponge to make the battery spill-proof. A completely sealed container also plays a vital role in ensuring that spills are negligible.

This battery is rigidly constructed such that there isn’t any room for plate movement. This allows for minimal vibrations and shock, hence reliable performance in bad weather.

Another thing that makes the 8016-103 D34M a favorite for many boat owners is that it has a quick recharge rate. As such, you never have to worry about waiting hours just to get it back to function.

When it comes to capacity, it offers 750 cold cranking amps. You also get a reserve capacity of 120 minutes for continued performance. Given the spill-proof capabilities, you can mount this battery in any position that best suits the purpose.


  • Doesn’t take long to recharge
  • Designed as dual purpose battery with Spiral Cell and AGM technologies
  • More than 15x vibration resistance compared to standard batteries


  • Easy to overcharge the battery if you don’t have the right charger

VMAX857 AGM Battery 12 Volt 35AH Marine Deep Cycle

VMAXTANKS batteries are known for their longevity and ability to recover from deep discharges. Like the #1 best battery for trolling motor, this one utilizes Absorbed Glass Mart (AGM) technology to improve performance.

Its rugged design combined with unique sealing technology helps prevent leaks. The ABS container is ultra strong and prevents plate warping, hence enhanced durability.

It has dimensions of 7.7″x5″x6.1″ and only weighs 25 pounds, making it a fairly compact unit. The battery has a capacity of 35Ah. You get up to 4-5 hours of service time when used on a 18-40lb trolling motor.

This makes it an average powered battery that’s best for small boats and vehicles. Its plates are made from custom military-grade alloys and all of the components are completely sealed with ABS plastic.

You can use the Vmax857 as a green power alternative to generators if you need backup power in case the electricity goes out at home.

With a capacity of 35Ah, this battery has more than enough power to run your DVD player and TV if you’re camping. It requires minimal maintenance and you can position at any angle that best suits the application.


  • Lightweight and compact construction
  • Has enough juice to power a throttle motor for several hours
  • Spill proof and can be set at any angle
  • Sturdy and durable


  • Costs more than other batteries with similar features

Optima Batteries 8006-006 34M BlueTop Marine Starting Battery

This battery 12-volt military-grade battery designed with AGM technology for enhanced performance. It is a group 34 battery that measures 12.1″ x 11.8″ x 11.5″ and weighs almost 42 pounds.

Like other Optima Batteries, this one features the cutting edge Spiral Cell technology that consists of two lead plates coated with lead oxide. It allows the battery to charge faster and power your boat for longer periods of time.

The Optima Batteries 8006-006 34M battery can be used for starting and deep cycling applications. It is completely spill-proof and you can mount it in any position that suits the purpose.

The sturdy construction means that this battery can resist shock and vibration for up to 15 times without getting damaged.

The reserve capacity of any battery refers to how long it can deliver 25 amps in an 80 degree Fahrenheit environment before it discharges to 10.5V. This model has a reserve capacity of 200 minutes, which is quite incredible compared to other batteries on this list.


  • High quality and durable construction
  • Charges quickly and powers your boat for longer
  • Low maintenance and spill-proof
  • Quite reliable even in harsh conditions


  • Expensive that batteries with similar features

Vmaxtanks MR107 Marine Deep Cycle Battery

The Vmaxtanks deep cycle battery is one that will meet all your fishing requirements, last long as your own trolling motor, and also friendly to your pocket.

It combines features of automobile batteries designed for producing short bursts of high power and the deep cycle batteries for golf carts and other equipment designed for continuous use.

The Vmaxtanks MR107 produces a cranking current of up to 1050 amps to get the motor started and can also run continuously for several hours like a deep cycle battery does. In fact, it can be discharged to 50% before needing a recharge.

Depending on its usage, maintenance, and other conditions, the Vmaxtanks battery can last up to 10 years. Why? Overheating is the number one enemy of many different types of batteries, but this is not the case with the Vmaxtanks AGM SLA since it’s designed to accommodate the expansion and contraction that occurs during normal operation.

Besides its ability to withstand overheating, the battery is also maintenance free and does not need watering throughout its life.

Moreover, the Vmaxtanks can withstand extremely cold temperatures without freezing or cracking.

Unlike flooded lead-acid batteries, the Vmaxtanks marine battery holds the electrolyte inside the glass mat rather than allowing it to flow freely over the plates.

This means that you won’t lose your valuable electrolyte if the battery is turned over or even held upside down. In other words, the battery can be mounted at any angle.

The Vmaxtanks is also the ideal trolling motor battery when it comes to safety. Since the electrolyte can’t leak the battery is safer for the environment and will not cause acids burns to you or your fishing gear.


  • High cranking amps
  • Runs continuously for several hours
  • Can be mounted at any angle


  • Expensive

Optima Batteries 8027-127 D27M BlueTop Deep Cycle Marine Battery

If you want to get the best performance out of your boat or kayak, you’ll need to have the best deep cycle battery to serve as its power. The Optima D27M has been used for years to crank the larger inboard and outboard engines.

In the Optima D27M, rolls of pure lead plates are technically fixed together to form six spiral wound cells. This sophisticated design offers a larger surface area and low internal resistance for lead alloy electrodes.

This doubles the cranking power and shelf life, as well as reduced charge time about 1 hour for a full charge. Your boat uses the Optima D27M with a strong 5-second starting burst for its primary function of starting the trolling motor.

Immediately after ignition, your boat’s electronic system will constantly monitor how much charge remains in the battery and whether or not to provide recharging power. The minimal internal resistance reduces full charge time to as low as 1 hour.

The battery case is made up of 6 cylindrical silos, each enclosing a specific spiral cell. The battery’s electrolyte is bound into the densely packed fiberglass fibers and cannot leak.

In other batteries, the acid can leak through vent valves or when a battery’s case is damaged. Again, the completely sealed design means that you will not add water or clean terminals.

The spiral cells and electrodes, as well as the fiberglass mats can withstand vibrations and impacts, and provide excellent performance under extreme temperatures.


  • Huge cold cranking power (1000amps)
  • Good reserve capacity

Optima Batteries 8020-164 35 RedTop Starting Battery

With its ability to produce over 720 cold cranking amps even in bad weather, the OPT8020-164 spiral wound cell battery is widely used in kitchen machinery, tractors, automobiles, off-highway tools, and marine and industrial equipment.

The OPT 8020-164 produces enormous, faster, and longer output power, resulting in greater cranking capability and a lower charge-depletion rate at high current loads.

The battery is really great as it is designed to work in situations which require lots of energy. It has literally dominated the marketplace for the last 10 years and has continued to be an important marine component to the point where there is one in every boat.

Not only does it provide the right amount of current to the trolling motor, but it also supplies electricity for the lights, stereos, GPS systems, and other electronic devices found on your boat.

The spiral rolled electrodes and the densely packed fiberglass mats not only provides consistent performance under extreme temperatures but also prevents electrolyte leakages and increases the battery’s resistance to impacts and vibrations.

This sturdy spiral cell design lessens the number one killer for most batteries -positive grid disintegration and plate shedding.


  • 15 times more durable than traditional batteries
  • Excellent resistance to impacts and vibrations
  • Produce constant power for more than 90 minutes

MinnKota Trolling Motor Power Center

The MinnKota Trolling Motor Power Center measures 14.9 x 8.7 x 15 inches and at around 1pound, it is a pretty compact and lightweight unit. It is one of the best trolling motor battery holders on the market and ideal for smaller boats that don’t have a battery compartment.

It will store your battery securely and save you plenty of space in the process. Its unique design allows you easy access to the battery terminal. You can, therefore, connect the leads of the charger without having to open the box.

This battery holder also comes with an inbuilt meter that measures and displays the current battery charge during any situation. You can utilize this power center for any battery of group 24 and 27 sizes. Another factor that makes it popular is that it comes with a few useful accessories.

Such include a couple of 12-volts plugs and two circuit breakers i.e. a 15-amp breaker for the plug and a 60-amp breaker for manual reset.

The plastic material used for construction is quite durable, but not the best for heavy-duty batteries. You will need to lock the strap of web once the battery is inside the case. The buckle system on the strap handles weight well and remains tightened even when the flexes at the top become loose.


  • Easy access to external battery terminals
  • Two manual circuit breakers provided
  • Has a built-in battery meter for monitoring charge


  • Doesn’t handle very heavy batteries well

Things to Consider Before Buying Best Deep Cycle Battery

Choosing the best batteries for trolling motor requires more than looking at just the battery brand, price and user reviews. In addition to the above reviews, the following specific factors will help you narrow down your choices.

Best Deep Cycle Battery

Absorbed Glass Mat

This innovation involves use of a substance that is similar to gel and a glass plate. Manufacturers use it to eliminate the need for adding distilled water by ensuring that the batteries are completely enclosed.

Batteries with this technology last up to 3-4 years longer than ordinary wet cell batteries. Unfortunately, this also means that they are more expensive.

Wet-cell Batteries

These are the basic deep-cell marine batteries and are durable enough to handle repeated series of charges and discharges. They require a little more maintenance and are more affordable to AGM batteries.

In addition, wet-cell batteries don’t last long and need to be replaced every 1-2 years.


Using a large battery is good for someone who owns a large boat. However, smaller boats are easily weighed down by the weight of larger batteries. That said, you may want to limit the weight to 40 pounds if you own a small boat.


Some batteries are designed to power on-board gadgets while others are for starting the motor. The battery you choose for your trolling motor should be able to work for other applications including motorcycles, jet skis, RVs, scooters, wheelchairs and more.

Vibration Resistance and Durability

Given the fact that there’s always a chance of finding yourself on choppy waters gears, it’s important to remember that intense vibrations caused by rough waters can damage your battery.

Some models have a higher resistance to vibrations compared to others. Depending on what your budget is, ensure that you purchase the most durable battery you can afford.


A battery that only lasts 6 months won’t do you any good. And while manufacturers make claims about their product lifespan and durability, it’s good to remember that warranties don’t always back those claims.

A good way to tell how long a battery will last is to look at customer reviews. Additionally, a long warranty cover is evidence that your battery will serve you for a long time.

Reserve Capacity

Depending on how long you plan on being on the water, you will need a battery that can power your boat for longer. The last thing you want is to take a day off from fishing because your battery isn’t charged or worse, get stuck on the water because the battery ran out of charge too soon.

Look out for models that last at least 4-5 hours on a full charge. Again, customer reviews are a good place to look for this information.

Determining the Health of a Deep-Cycle Battery

Maintenance Tips for Trolling Motor Battery

Anyone who depends heavily on trolling motor batteries should know the basics of maintenance. The reason is that these batteries need to be well taken care of to ensure optimum performance. Regular maintenance also prevents extensive damage and saves you money in the form of repair or replacement expenses.

New Batteries

Every new battery should be cycled several times before reaching capacity, preferably 20-50 cycles. It’s important that you limit how deep you discharge a new battery. It should be treated like a baby that needs to be nurtured into a rhythm.


The water you use to replenish your battery should be treated not to exceed 200TDS. It’s also important that you take extra care not to use water with iron. Always opt for distilled water rather than spring or tap water.

Discharging Battery

Never discharge your battery below 80%. This also applies to deep cycle batteries that are designed to be charged and discharged over and over. Anything past 80% only works them harder, thus increasing the risk of sulfation of battery plates.

Regular Battery Testing

Testing your battery at least four times every year is a good way to identify potential and existing problems. Check the hydrometer readings for indication of true charge and balance.

The voltage will let you know if your battery is still strong or needs replacing. Load testing is another good way of knowing if a cell is good or bad.

Additional Tips

  • Don’t use a mismatched charger: An oversized charger will cause gassing, thermal runaway and in extreme cases, explosion. An undersized charger, on the other hand, won’t be able to get the job done regardless of how long you try.
  • Like muscles, batteries need to be used regularly. Alternatively, you can give them a boost charge if they sit for a few months without any use. This is because inactivity harms them.
  • It’s important to remember that as they get older, the maintenance requirements of batteries change. Gassing voltage goes up and so does the specific gravity. This ultimately means higher amperage at the end of charge and longer charging periods. In addition, older batteries need to be watered more often. Otherwise, their capacity will decrease.

Final Verdict

It’s quite easy to overlook the battery when in a boat. It is easier to assume that one battery is like another. All it takes to realize that choosing a good trolling motor battery is important is getting stuck in the middle of the lake.

That said, you want to make sure that you know what to look for before you start shopping. With every manufacturer claiming to provide the best motors, it wouldn’t hurt to do as much research as possible.

This guide aims to give you all the information you need to make the right choice. Got a question? What trolling motor battery do you have? Don’t hesitate to tell us about your experience in the comment section.

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