The 7 Best Marine Batteries Reviews 2021 Updated (2022)

Getting the correct Marine Battery is never an easy task. There are a handful of options available in the market, and choosing the perfect one between them can be tricky. So in this buyer’s guide, we are going to help you to make an informed decision about buying the best marine battery for your boat.

The first step towards buying a new marine battery is to decide what purpose will it be serving you. There are mainly three different types of Marine Batteries available. A Marine Starter Battery is used to generate an intense burst of energy to start your engine while a Deep Cycle Marine Battery provides you with a small amount of power for a really long time for trolling purposes. The third variant, The Dual Purpose Marine Battery, is the all-rounder of the group. It can do both cranking and trolling but not as good as the other two specialized batteries.


    • 2.1 1. Universal Power Group Sealed Lead Acid Battery
    • 2.2 2. VMAXTANKS AGM Marine Deep Cycle Battery
  • 3 Best Marine Starting Batteries
    • 3.1 3. Optima Batteries BlueTop Marine Starting Battery
    • 3.2 4. Odyssey 31-PC2150S Heavy Duty Starting Battery
    • 3.3 5. Mighty Max ML35-12 – 12V 35AH DEEP Cycle Battery
    • 3.4 6. Mighty Max Battery 12V 55Ah DEEP Cycle Battery
  • 4 Best Dual Purpose Marine Battery
    • 4.1 7. Optima 8027-127 D27M BlueTop Dual Purpose Battery
  • 5 Different types of Marine Batteries
    • 5.1 Flooded Cell Battery
    • 5.2 Gel Battery
    • 5.3 AGM Marine Battery
  • 6 How to Choose the Best Marine Battery
    • 6.1 Usage
    • 6.2 Capacity
    • 6.3 Reserve Capacity
    • 6.4 Dimensions and Weight
    • 6.5 Care and Charging
    • 6.6 Cold Cranking Amps
    • 6.7 Battery Boxes
  • 7 FAQs About Marine Batteries
    • 7.1 What is the difference between a Starting Battery and a Deep Cycle Battery?
    • 7.2 A Dual Purpose Battery or a combination of Starting and Deep Cycling Batteries, Which one should I buy?
    • 7.3 Can I use a Deep Cycle battery for starting engines?
      • 7.3.1 Wrapping up


  1. Universal Power Group Sealed Lead Acid Battery
  2. VMAXTANKS AGM Marine Deep Cycle Battery
  3. Optima Batteries BlueTop Marine Starting Battery
  4. Odyssey 31-PC2150S Heavy Duty Starting Battery
  5. Mighty Max 35AH DEEP Cycle Battery
  6. Mighty Max 55Ah DEEP Cycle Battery
  7. Optima BlueTop Dual Purpose Battery




1. Universal Power Group Sealed Lead Acid Battery

Universal Power Group’s UB12350 is one of the best batteries for all kayakers out there. Now go to any place, where the water surface is available, on your kayak without having a sore hand.

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  • Being an AGM battery, it is a total maintenance-free unit. Just don’t overcharge it, else it will be on service for 4-5 years with zero resources spent on maintenance.
  • This model is available in two different capacity options: the smaller 35Ah unit and the larger 75Ah unit.
  • The outer case is made from hard plastic so it will prevent any spilling and corrosion.
  • As it is a Deep Cycle battery, you can expect 1200 cycles at 30% discharge or 300 cycles at full 100% discharge.
  • It has a wide operational temperature range of 35°F to 105°F for charging, 5°F to 115°F for using and 1°F to 120°F for storage.
  • This battery is a great option for a secondary backup battery as it has only a 3% self-discharge rate per month in storage. It can retain 64% charge after a year of idle sitting at 68F.


  • The 35 Ah variant is the perfect battery for motorized kayaking. It only weighs 22lbs and can easily be carried around in a kayak for trolling. So all of you kayak lovers if you want to spend 4-5 hours of motorized kayaking you should seriously consider this product for your next kayaking adventure.
  • Besides trolling, this battery can give you a power source for all your electrical and electronic equipment constantly for around 6 hours. It can do tremendous deep cycling up to 100% discharge for 300 times which can last more than 5 years.
  • The smaller variants start from as low as 54 bucks on Amazon. A Deep Cycling Marine Battery at this price point is a great bargain and provides a cost-effective way of fishing. It also has a great user rating 4.2 stars out of 5 on Amazon with 76% of all ratings being a 5 on 5.


  • This battery is not made for big and heavy boats. Even the 75Ah variant will also struggle to pull anything bigger than the 2500lbs boat. So if you own a heavy boat, you should bypass this one.


Universal UB12350 is already a popular choice among consumers. This battery is a great value for money option if you consider its asking price. So if you are looking for a small yet powerful battery, then go for it. you will not regret it.

2. VMAXTANKS AGM Marine Deep Cycle Battery

VMAX is a familiar name in the battery industry. They are building a dependable, high-performance product for quite some time. VMAX V35-857 is no exception to that. Though it is a smaller battery, V35-857 offers some great features that are unavailable even on bigger expensive units. Let’s begin this marine deep cycle battery review.

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  • VMAX V35-857 is a smaller 35Ah battery. So it is a perfect fit for smaller boats and kayaks.
  • This battery can recover full capacity even after discharging up to 60% for an extended period of time, thus giving you a service life of 5 to 8 years on average.
  • If you are powering an 18-35lbs trolling motor you can expect backup for 6-10 hours with a 50-60% discharge rate.
  • This battery can be used and stored at anything between -4°F to 140°F. Charging temperature ranges from 14°F-130°F.
  • Being an Absorbed Glass Mat battery, it is completely leakproof and maintenance-free. You can use it for years without spending any resources on it.
  • This battery has heavy-duty lead-tin alloy bars in its core which not only gives you an unmatched performance but also can last for a long time in float or cyclic applications.


  • VMAX V35-857 comes with an integrated carrying handle which, along with its smaller size and lighter weight, makes it a great portable battery. You can easily carry this thing around from one place to another without much hassle. The smaller size is also a perfect fit for any small-scale boat.
  • VMAXTANKS gives you the option of a full refund within 30 days of purchase if somehow this product fails to meet your expectations. Returning within 30 days is also free of any charge. Additionally, you will get 12 months warranty for any kind of manufacturing defect.
  • This battery comes with a hard plastic exterior that not only protects all the inside stuff from difficult marine conditions like vibration, extreme temperatures but also prevents any toxic material from spreading out of the battery due to overcharging or corrosion.


  • As VMAX provides you with the absolute best quality and long service life, all of their products are a bit costly compared to the other competitors. This battery is also not an exception to that.


If you want the best small-scale battery and don’t want to compromise with the quality just to save a few bucks then this battery should be the perfect choice for you.

Best Marine Starting Batteries

3. Optima Batteries BlueTop Marine Starting Battery

Now this one is a starting battery that has a different application than the above two deep cycles. Optima 34M BlueTop has the ability to start your engine in sub-zero temperatures, thus making it one of the best marine starting batteries.

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  • Because of its precision-controlled manufacturing process, this model can deliver up to 3 times more recharges than its competitors.
  • This battery can generate 800 cold-cranking amps which are more than enough cranking power to kick start your motor in any freezing situation.
  • This battery is built on AGM technology, with spiral-wound cells that have lead bar coated with lead oxide in the core for better power generation.
  • It has a minimal internal resistance, so it gives you efficient power output and fast fill-ups. This one is also compatible with most of the fast chargers for AGM batteries.
  • This is a 50Ah battery that means its compact in size and can be used in your land vehicles like your pickups or RV also. It can generate enough cranking power to start any mid to large-sized engine.


  • Every Optima product comes with a 24 month warranty period for manufacturing defects. So even if you get a faulty unit, you have the option to exchange it with a new one completely free of cost that too after using it for 2 years.
  • This battery weighs only 41 lbs. This is a huge advantage for the marine battery. You can mount it in any place or in any position you want. Being an AGM marine cranking battery this is a leakproof unit. So you can even mount it in an upside-down position also.
  • Starting batteries have a wide range of applications. You can use this battery when it is not in use on your boat. You can plug it in your car and can power up your car’s ignition with the 800 CCA available. You also use it in your RV for powering different consumer electronics inside your RV.


  • As it is a starting battery, Optima 34M BlueTop can not do deep cycling effectively. So you have to use a different deep cycling battery along with it.


This product is one of the best if not the best 50Ah starter battery available in the market. If you want a value for money starting battery, then you should definitely go for it.

4. Odyssey 31-PC2150S Heavy Duty Starting Battery

This is another great starting battery, and this one is from Odyssey. Odyssey PC2150S is the big battery that is compatible with small to giant all kinds of a fishing boat.

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  • This is a colossus battery. It generates 1150 CCA, which is great for a sub-zero environment starting. You will not face any problem regarding cranking of your motor if you have this battery on your disposal
  • This battery has a reserve capacity of 205 minutes which is a big number in the battery industry
  • This battery has an almost 70% cycle life span compared to conventional boat batteries. It can go up to 400 cycles for 80% discharge rate
  • This battery can tolerate extreme temperatures also thanks to its protecting outer shell. Operational temperature for this battery ranges from -40°F to 113°F
  • It can generate a very high rate of discharge for a small period of time like 2,150 amperes for 5 seconds, 1,985 amperes for 10 seconds, 1,800 amperes for 15 seconds, 1,750 amperes for 20 seconds.


  • Odyssey offers 4 years of full replacement warranty so that if your Odyssey PC2150S is not performing like it should have done, then you always have the option to change it with a completely new unit even after repurchasing the original one 3-4 years.
  • This battery comes with a superb speed of charging as it can charge itself from 0 to 100 within 4-6 hours depending on the charger and power output. This is a lifesaving feature for all those heavy users out there.
  • Odyssey PC2150S is a heavy-duty commercial battery so it can be used in construction equipment, farming equipment, tractor-trailers, buses, and trucks. These various applications make this battery one of the most useful and versatile battery.


  • Starting from $399.99 at Amazon, you have to pay a hefty amount to own this battery. There are other cheaper options available though those won’t be as good as this battery.



If you have a bigger full-size troller, then this battery is all you need for the next decade. Amazon’s customer’s rating of 4.3 stars suggests how good this battery can be.

5. Mighty Max ML35-12 – 12V 35AH DEEP Cycle Battery

Mighty Max ML35-12 is a 35Ah deep cycle battery which is mainly built as storage capacity for solar panels. But this battery is also a useful tool for all those small boat owners. This is the most affordable option in my marine deep cycle batteries review.

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  • All the Mighty Max batteries use Calcium alloy grids which not only generates excellent power but also gives an extended service life
  • This 35Ah battery is one of the lightest and smallest batteries that can be fitted in any small place or in any position you want.
  • This battery has a plastic carrying handle built in so moving from one place to another is child's play
  • Durable hard plastic exterior not only gives this battery a nice look but it also prevents any leaking or spilling of toxic material
  • Being an AGM battery, this one is capable of fast charging. With a good fast charger, this battery can be charged from 0 to 100% within 4 hours.


  • This battery is one of the most low-priced AGM batteries available currently. If you have a small boat or kayak and you don’t want to overspend on a deep cycle battery, then this is the perfect product for you.
  • This battery comes in with 30 days return policy so if you think this one is not up to the mark or you need a bigger battery you can always get a full refund within 30 days of purchase. Additionally, Mighty Max offers a 1-year warranty on manufacturing defects that too for free of cost.
  • Mighty Max ML35-12 has a high discharge rate of 80% up to 300 cycles. This lets you utilize most of your battery resources while you are on the water without recharging it repeatedly. This battery also has a wide range of operating temperatures and storing temperatures.


  • As it is a smaller battery, it won’t be a good choice if you are planning to do a lot of heavy-duty stuff with it. In that scenario, you should consider buying a bigger battery.


If you have a restricted budget and you want a good deep cycle battery within that budget, then Mighty Max ML35-12 is the battery you should go for. You will be really satisfied with this value for money battery.

6. Mighty Max Battery 12V 55Ah DEEP Cycle Battery

Here's another Mighty Max product. ML55-12 is the big brother of ML35-12. This 55Ah battery is the perfect marine deep cycle battery for your mid-sized motor.

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  • ML55-12 is a Seal Lead Acid (SLA) battery. It requires zero maintenance over the years. Just be careful while charging because overcharging can cause damage
  • This battery can do 400 cycles with 75% discharge or 600 cycles with a 60% discharge rate so that you can utilize the power when needed.
  • Outer solid plastic case keeps this battery protected in difficult marine conditions and gives this battery an extended service life
  • This battery has an operating temperature range of 15F to 110F and a storage temperature range of -5F to 110F. So it will get the job done most of the time
  • ML55-12 is an Absorbed Glass Mat battery that means you don’t need to worry about acid leakage or gas leakage.


  • This is one pocket-friendly battery. Starting from $109.99 in Amazon, this is a great value for money battery. This curtailed price doesn’t affect battery performance. 72% 5-star rating on Amazon suggests that ML55-12 has satisfied a lot of consumers
  • This battery has a peak power of 55Ah, which is enough for any mid-sized engine. So if you are thinking of using this battery on your boat for trolling purposes, then it’s a good choice. This is one of the best boat batteries at its price point.
  • Mighty Max provides 30 days full refund policy and a 12-month warranty against manufacturing defects. So if you have a faulty unit at disposal, you have the option to change it with a new one within a full year of purchase.


  • Overcharging is a common problem for every AGM battery. ML55-12 is no exception to that. If you overcharge it for a long period of time, then you will have a destroyed battery sooner or later.


This ML55-12 is a good option to go with considering its price point. All those fishing lovers who have a tight budget but want a good battery for their boat, Mighty Max ML55-12 is the one for them.

Best Dual Purpose Marine Battery

7. Optima 8027-127 D27M BlueTop Dual Purpose Battery

This is the last entrant of this marine batteries review. Optima D27M BlueTop is a dual purpose battery. As the name suggests, it can do both cranking and deep cycling.

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  • This battery generates 800 Amps for cold cranking. This means you will not get any trouble starting your engine in the winters
  • This battery has a capacity of 66Ah and has a reserve capacity of 140 minutes. So even after trolling for 5-6 hours, you will still have some resources left in your battery
  • Thanks to the hard plastic shell, this battery is leak and spill-proof. All the toxic substances will be inside the battery case forever
  • This battery comes with a spiral-wound design and compressed cells for better vibration resistance. Your boat’s vibration won’t affect the battery’s longevity
  • D27M BlueTop will last for 6-8 years in float mode with 350+ discharge and recharge cycles


  • This is a Dual Purpose battery so you won’t need to carry two separate batteries for starting and deep cycling thus you will save carrying some extra pounds for a secondary battery.
  • All Optima batteries come with 24 months replacement warranty for any defects in material and workmanship. Even if you get a flawed unit, you have enough time to find out and get a new unit free of cost.
  • Optima D27M BlueTop has a quick charge feature. This battery can be fully charged from 0 to 100 within 5 hours using the proprietary fast charger. This is very useful for heavy users who need to fill up their batteries as soon as it gets empty.


  • Like every other AGM batteries, this battery is also prone to damage while overcharging. So if you decide to buy an AGM battery, you have to be careful while charging.


This is a multi-talented versatile battery you can get for your boat. By buying this battery, you could save some bucks as you won't have to buy a secondary specialist battery.

Different types of Marine Batteries

To choose a good battery for your boat, you first need to have basic ideas about marine batteries like what is the marine battery and in what different versions do they come. Here is the brief information about 3 different variants of Marine Batteries.

Flooded Cell BatteryGel BatteryAGM Marine Battery

Flooded Cell Battery

These batteries are the most commonly used and cheapest of its kind. A Flooded Cell Battery uses sulfuric acid and water as an electrolyte solution that covers lead plates in the center of the battery. This type of batteries can produce toxic gas during overcharging, thus requires vented boxes to let escape the gases safely. Invented around 150 years back, this type of batteries are still in use due to their cost-effective nature.

Gel Battery

To solve the leaking problem of Flooded Cell Batteries, the latest battery technology was invented. These are known as Gel Batteries. It uses Sulfuric acid, fumed Silica, Phosphoric acid, and water, which makes a viscous gel inside of the battery, thus prevents leaking to a great extent. This battery type is more expensive than Flooded Cell batteries but does a better job in terms of concealing.

AGM Marine Battery

Absorbed Glass Mat Battery features a glass mat with acid electrolytes between the positive and negative plates. Having a solid-state electrolyte carrier like a glass mat makes this battery virtually maintenance-free and leakage proof. It also increases the value by some bucks when compared to Flooded Cell or Gel batteries.

How to Choose the Best Marine Battery

There are some basic features and specifications you can check to differentiate between a good and a not so good battery.

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Before choosing a battery, you should first decide how you age going to use it. If you want superior performance from your battery, then you should buy two separate batteries for starting and deep cycling. But if you are short on budget, then you can get a single Dual Purpose battery for both of the usage.


Battery capacity is known as the ability to store charge by a battery. Amp Hour (Ah) ratings measure it. From 30Ah to 200Ah, there are wide varieties of battery available in the market. The greater the battery capacity, the bigger the price tag will be for any battery.

Reserve Capacity

The maximum time, a fully charged battery, takes to discharge at 25 Amps at 80°F temperature till the voltage drops down to 10.5V, is known as the Reserve Capacity of a battery. Reserve Capacity is measured in minutes. Generally, a battery with a Reserve Capacity of 120 minutes or more is considered a standard battery.

Dimensions and Weight

When you buy a battery for an outboard motor, you have to carry it and mount it on your boat. This task can become very laborious if you buy a huge battery. So before buying a battery, check its dimensions and weight and try to choose a lightweight yet powerful unit.

Care and Charging

There are some specific caring and proper charging involved to maintain a battery. Without following some ground rules, one can easily damage his/her battery within a year of purchase.

Flooded Cell Batteries require more maintenance than any other type. You have to check the water level at regular intervals. If the water level drops, then you have to fill it up with distilled water.

Comparatively AGM batteries are easier to maintain. Unlike Wet-Cells, There is no refilling involved. You just need to be cautious during recharging. Repeated overcharge can harm an AGM quite badly.

Cold Cranking Amps

Cold Cranking Amps (CCA) is a rating that determines a battery's capability to start a motor in a cold environment. CCA refers to the particular number of amps a 12V battery can generate for 30 seconds at 0°F temperature while maintaining at least 7.2V voltage output.

CCA is a vital stat, especially for any Marine Starting Battery and Dual Purpose Battery. Having a CCA rating of 750 amps or more is a must for your battery if you live in any of the northern regions of Earth.

Battery Boxes

If you are going to take your battery to the sea, then you should consider buying a battery box for your precious battery. Not only a battery box protects your battery in the harsh marine environment, but it also stops any battery contamination from spreading.

There are a lot of different battery boxes available to choose from. They also come in different shapes and sizes. The most popular and widely used variants are 24, 27, 30, and 31 inches. Check your battery's dimensions before buying a box for it, to have a perfect fit.

FAQs About Marine Batteries

What is the difference between a Starting Battery and a Deep Cycle Battery?

Both Starting and Deep Cycle Batteries have a different application altogether. Marine Starting Batteries are mainly used to generate cranking energy to start a boat in cold temperature while a Marine Deep Cycle Battery is used to generate a small amount of energy over a long period of time for trolling and other power outputs.

A Dual Purpose Battery or a combination of Starting and Deep Cycling Batteries, Which one should I buy?

This really depends on your requirements and budget. If you want the best performance from your battery, then you should get two specialist batteries for cranking and deep cycling respectively. But if you want decent performance and wish to save some money then go for a good Dual Purpose battery.

Can I use a Deep Cycle battery for starting engines?

Technically yes. I deep cycle battery can start an engine, but it generates way less cold-cranking amps compared to starting batteries. So if you want to start your motor with a deep cycle battery in chilly condition then chances are, you might face difficulty starting your motor.

Wrapping up

If you are reading this part of the article, then I guess you have made your mind which battery to get for your boat. If you are still confused, then I will suggest you shortlist the top 3 batteries of your choice and then compare them by specs on Amazon. A side by side comparison can clear your mind. A marine battery will stay with you for almost a decade. So choose wisely. You can also check our wonderful buying guide for the best trolling motor battery. It will help to choose more powerful batteries for your boat. Till then goodbye and happy fishing.

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