Best Deep Cycle Marine Batteries – 2021 Complete Round-up

| Last Updated December 10, 2020

When it comes to marine batteries, deep cycle batteries are one of the most popular options.

To ensure your motor has the power to keep your boat in motion, we’ve put together a list of some top-of-the-line battery choices in a variety of categories.

This article will also walk you through the ins and outs of a great deep cycle battery.

Our Top Picks for Deep Cycle Marine Batteries

  • Good power
  • High-quality materials
  • Strong construction
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  • Long power life
  • Great value
  • For many devices
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  • Small, powerful
  • Budget-friendly
  • Safety features
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Comparison of the Best Deep Cycle Marine Batteries

  • Provides a good amount of power
  • High-quality materials used in construction
  • The best deep cycle marine battery on our favorites list
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  • Long power life
  • Great overall value
  • Power output can handle a lot of devices
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  • Small but mighty
  • Our favorite budget pick
  • Great built-in safety features
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  • Very quick recharge
  • Durable, sturdy housing
  • Long cycle life provides more power over time
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  • Long-lasting power
  • Quick to recharge fully
  • Constant power thanks to 2 hour reserve capacity
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What is a Deep Cycle Marine Battery?

Deep cycle batteries are batteries that are designed to release power over time. This is different than a battery that would typically be found in car, as those are typically used only for starting or cranking. Deep cycle batteries allow for a sustainable lower-level power source, rather than short bursts of high intensity power. These batteries are suited for boats because watercraft often requires power for other applications aside from the engine.

What Makes a Great Deep Cycle Marine Battery?

There are many different kinds of deep cycle batteries from a multitude of companies available in today’s market so the purchasing process can be a little bit daunting. When you’re in search of a great deep cycle marine battery, you should keep the following aspects in mind to make sure you’re getting the best bang for your buck.

Power Capacity

The first thing you’ll want to consider when it comes to a deep cycle battery is the voltage. This will show how much power is available for use. Your need for a higher voltage will depend on the size of your engine, but in general, the higher the voltage, the more power it can provide. 

Size and Weight

The shape of your battery is something that should definitely come into consideration, especially if you’re operating on a smaller-sized watercraft. Many batteries are big, bulky and awkward, so if you can track down a low profile battery with enough power to operate your watercraft’s engine, go for it. 

Amperage Hours

Amp hours show how much time you can use the battery before having to charge again. The higher the amp hour, the more time you can take in between charges.

Quick Take | Best Deep Cycle Marine Batteries

Review of the Best Deep Cycle Marine Batteries

In this section, we’ll walk through some of the best-of-the-best deep cycle batteries of 2019. Take a look and see if any strike your fancy. 

Vmaxtanks VMAXSLR125 AGM 12V 125Ah SLA Rechargeable Deep Cycle Battery for Use with Pv Solar Panels Smart Chargers, Wind Turbines and Inverters and Backup Power (12 Volt 125Ah Group 31 AGM)


  • Charges up quickly
  • Battery life lasts a long time
  • Durable construction and design
  • Durable housing and construction
  • Created with military-grade custom plates


  • Some quality control issues
  • Loses battery capacity over time
  • Pretty heavy, not easy to transport

What Recent Buyers Report

Vmaxtanks deep cycle battery users had great feedback overall for this battery. Anglers weren’t so pleased with the size and weight of the tool, but other than that, the reviews were pretty positive. Among other things, anglers were pleased with the power capacity, durable housing, the use of high-quality materials in construction, and consistently reliable performance.

Why it Stands Out to Us

We like the Vmaxtanks battery for its power output and consistency. While we’re definitely not fans of the weight, once you can get it in place in your boat, you can count on the tool to get you where you need to go.

Who Will Use This Most

We’d recommend this deep cycle battery to those anglers who need something consistent. This is a better fit for those with bigger boats, as it could easily weigh down a kayak or dinghy too much. But for those with a larger watercraft, this battery can provide reliable performance for years to come.

Bottom Line

Durability, consistency, and power come together in the perfect combination in the Vmaxtanks deep cycle battery. Although it is a big boy, it does it’s job really well and would be an exceptional pick for anyone who needs a great marine battery for their next fishing trip.

Universal Power Group 12V 100Ah Solar Wind AGM SLA DEEP Cycle VRLA Battery 12V 24V 48V


  • Excellent power output
  • Awesome value for the price
  • Ready to go right out of the box
  • Provides power for long spans of time
  • Comes with an extra bolt-on contact for an extra attachment


  • Very heavy and awkward
  • Connection hardware is a little short
  • Some quality control charging issues

What Recent Buyers Report

Recent buyers of the Universal Power Group’s deep cycle battery has both positive and negative feedback to report. Users appreciated the power capacities each battery contained and the length of time they provided power. Some buyers did face quality control issues that put a damper on their experience, but the majority of reviewers were pleased with the value and performance of the battery.

Why it Stands Out to Us

This product earns our number two spot because we love the amount of time this battery provides power. It’s a huge benefit to not have to be worried about getting back to the shore to charge your setup. We’re also fans of the spill-proof design and the fact that this is maintenance-free.

Who Will Use This Most

This deep cycle battery is a solid choice for those who want a low maintenance setup that provides excellent power over the course of a day. Although this is a pretty heavy battery, it is also a good shape and size for storage on a boat, so there’s no need to worry there.

Bottom Line

Although some buyers didn’t have the greatest experience with this battery, overall, we think this rig is still a product worth giving a try. It has some awesome features that make it easy and low-maintenance and it’s a reliable source of power.

Mighty Max Battery 12V 35AH Replacement Battery Compatible with Minn Kota Sevylor Light Trolling Motor Brand Product


  • Excellent value
  • Spill-proof design
  • Compact, convenient size
  • Shock and vibration resistant
  • Lasting power despite the small size


  • Comes with no instructions
  • Power display isn’t always accurate
  • Doesn’t fit in some designated power centers

What Recent Buyers Report

The Sevylor Minn Kota trolling battery holds a special place in the hearts of some buyers. Anglers really appreciated it’s compact size (although it is too small for some ‘designated power centers’), and appreciated the sturdy durable design and reliable power output.

Why it Stands Out to Us

This battery is an excellent example of “small but mighty” which is why we included it on our list, not to mention the super affordable price. It’s tough to find a lightweight battery that can fit on a kayak or a dinghy, but this setup does the trick, providing lasting power despite its relatively small size.

Who Will Use This Most

The Sevylor from Minn Kota is the perfect battery to bring on your kayak or other small watercraft that you’ve rigged up a trolling motor with. Although it doesn’t have the power capacity that some larger batteries can provide, this little guy can give you enough juice for a solid afternoon of fishing without crowding your space.

Bottom Line ​

Don’t judge a battery by its size. The Sevylor from Minn Kota is a mighty little thing, perfect for those with kayaks or other small watercraft looking to power their trolling motor. Although there are more powerful batteries on the market, this is a great product for morning or afternoon trips.

ODYSSEY PC680 Battery, red top


  • Long cycle life
  • Variation in mounting setup
  • Vibration and shock-resistant
  • Created with durable materials
  • Takes only 4-6 hours to charge fully


  • Not super easy to install
  • Doesn’t do well in cold temperatures
  • Does not come with battery terminals

What Recent Buyers Report

Buyers of the Odyssey battery were, overall, pretty happy with the experience they had with the product. Users appreciated the quick charging system and the durable set up. Many commented that they could tell that the battery was created with high-quality materials just from the look and feel.

Why it Stands Out to Us

This is a stand-out product that earned a spot on our list for a couple of different reasons. First of all, we appreciate the cycle length of this deep cycle battery, which provides a great amount of power for longer periods of time. We also appreciate the durable, vibration and shock-resistant housing.

Who Will Use This Most

This is a solid overall pick for a variety of boat anglers. One thing to keep in mind is that this battery doesn’t perform its best in cold weather. Odds are, you probably wouldn’t be taking out your boat when the temperatures start to turn, but it is something to keep in mind.

Bottom Line

While this may not be the best battery for all angling scenarios, for the majority of boat users, the Odyssey would do the trick just fine. It’s durable, reliable and consistent, a great combination for a marine battery.

Optima OPT8016-103 Batteries D34M BlueTop Starting and Deep Cycle Marine Battery


  • No leak design
  • Provides power for a long time
  • Recharges to full power quickly
  • Great size and shape for small boats
  • Holds up to very warm temperatures


  • Could provide more voltage
  • Can lose their effectiveness over time
  • Isn’t compatible with several battery chargers

What Recent Buyers Report

The initial response to the Optima deep cycle battery was very positive. Most buyers were very happy with the length of time the battery could operate and were excited by its quick charging time. Some anglers did wish that the Optima operated at a higher voltage level, but it wasn’t a concern for many.

Why it Stands Out to Us

We gave the Optima a spot on our list for many reasons, but the main draw for this battery is that it is an all-in-one purchase. Not only does this battery provide awesome, lasting power, but it’s also quick to recharge, it holds up in a wide variety of settings, and it is well-crafted and durable.

Who Will Use This Most

We’d recommend the Optima battery to any boat angler who needs a great charger that can last for hours on a long fishing trip. Although this set up is a little more expensive than others on the market, buyers say that the results are totally worth shelling out the extra cash.

Bottom Line

Although this battery might have the power of some bulkier deep cycle rigs, the Optima is not to be overlooked. With great features including safety precautions, a quick charge system, and a durable build, this is a good option for everyone and anyone.

Are All Deep Cycle Marine Batteries the Same?

No two batteries are created equal, and the same goes for deep cycle batteries. Although many do have similar qualities, there are common product variations that you’ll come across. We’ll discuss the different types of deep cycle marine batteries in the next section, but aside from internal make-up, deep cycle batteries differ in power capacity, amp-hours, size and shape and much more. 

Types of Deep Cycle Marine Batteries

Although all deep cycle batteries have the same basic functions, there are several different types that users can choose from. The most common are flooded AGM, and gel deep cycle batteries. 


AGM batteries consist of a fiberglass separator, lead plates, and an electrolyte. Capillary action is used to hold the electrolyte in place and create a physical bond. The capillary action keeps the liquid within the fiberglass plate. The internal resistance is very low, which has a plethora of benefits, including less charging time, increased power voltage, and less heat loss overall. 


Gel batteries are sealed and use silica to convert sulfuric acid into a jelly-like substance. This new goo is used as the electrolyte in the equation. The jelly can become scarred when exposed to a high amperage, creating a pocket within the gel, which paves the way for eventual corrosion. Although the internal construction is stronger in comparison to some batteries, it doesn’t have the overall power capacity that others have as it can quickly fail when exposed to high amperage. 


Flooded batteries are versatile and come in all kinds of shapes and sizes. They function with the help of lead plates, a sulfuric acid electrolyte, and plate separators. They are unsealed and release gasses through external vents. The vents also flow acid, steam, and condensation and need to be maintained regularly. They are often considered to be not as durable, but damage and corrosion can easily be combated with consistent maintenance. 

Advantages of Getting a New Battery

Although it may feel tempting to go for a used marine battery, there are some risks you’ll face. New batteries might be a little more spendy, but making that investment is totally worth it in the end. Consider the following:


An awesome marine battery can be charged thousands of times and not show signs of wear. With the help of durable construction and the use of high-quality materials, great marine batteries can be used for decades, making your investment totally worth it over time.

Quick Charging

Older batteries can lose their quick charging time over years of use. Investing in a new battery will ensure that you can experience quick charging time for longer, making the whole process a little more convenient. 

User-friendly Features

Many new batteries in today’s market have built-in features that make it easier to use and install. It is no fun to get a new battery only to have no idea how to install it in your watercraft. With a newer battery, you’ll have a better chance of having an easier time.


With the information in your hands to make an informed choice, you’re only steps away from getting your next great deep cycle marine battery. Above all, make sure quality is at the top of your priority list and you’ll be set. Happy fishing! 

People Also Ask

Still, have questions about deep cycle batteries? Other people did too! Here are some of the most frequently asked questions when it comes to deep cycle batteries and how they work.

Do Deep Cycle Batteries Need Special Chargers?

If you’re using a deep cycle battery, you should seek out a deep cycle battery charger. Deep cycle battery chargers are temperature and battery-chemistry dependent, which is a good combination of maintenance and performance.

Can I Charge a Deep Cycle Battery With a Regular Charger?

You can, but you shouldn’t. Using a battery charger that isn’t equipped to handle deep cycle batteries can reduce the effectiveness of your batteries over time.

How Long Does a Deep Cycle Battery Take to Charge?

All batteries are different when it comes to charging time. It will depend on the number of amp hours your particular battery holds and the power of your charger. It can vary between four hours all the way to 24 hours. 

How Many Volts is a Fully Charged Deep Cycle Battery?

It depends on the battery. A common voltage for deep cycle batteries is 12 volts. 

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My name is Jeff and I have been hunting and fishing for over 40 years. I am an avid archery lover, bass fisherman, and all-around outdoorsman. Currently, I'm obsessed with elk hunting but I'm sure I'll move onto a different favorite soon. You gotta love hunting for that reason :) If you have any questions, or just want chat about your latest hunting score or big catch, you can reach me at Read more about Big Game Logic.