Best Marine Battery 2021(Expert Recommendation & Reviews)

Are you looking for a battery or a dual-purpose battery to start up your boat engine or to power on devices on the boat? You’ve come to the right place. Here, you’ll learn about the different types of marine batteries, like deep cycle batteries or trolling motor batteries,  what features to look for, and view some of the best marine batteries on the market.
Choosing the best marine battery from the load can be a challenge, especially if it’s your first time doing so. There are many brands and types of batteries to choose from, which can be somehow confusing.

Top 10 Best Marine Battery comparison Chart

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In this marine batteries reviews, we’ve made things easy for you by creating a detailed guide and reviewing some of the best marine batteries on the market. Read our review below and thereafter a buying guide that will help you select a battery that meets your needs and budget.


Top rated 10 Best Marine Battery Review 2021

Here are our top batteries for boats:

Optima batteries 8052-161 D31M BlueTop Starting and Deep-Cycle Battery

Optima batteries are one of the best marine battery brands on the market. The Optima 8052-161 BlueTop battery can be utilized for both starting and deep cycle. It is also one of the most powerful batteries for marine and recreational vehicles. The battery uses spiral cell technology that makes it be efficient in performance. Moreover, it comprises AGM plates that hold electrolytes firmly to make sure that no spills occur. In addition, the technology ensures that there are no acid leaks or corrosion.

Read more about the Optima d31m Review here

This battery can work excellently even in bad weather and gives 3 times battery power as compared to standard batteries.

Technical Specifications of the Optima batteries 8052-161 D31M BlueTop Starting and Deep-Cycle Battery:

Features Optima batteries D31M BlueTop Starting and Deep-Cycle
C20 Capacity: 75 Ah
CCA: 900 Amp
Reserve Capacity @25 Amps: 155 Minutes
Voltage: 12 Volts
Length: 12.81 in
Width: 6.56 in
Case Material: Polypropylene
Cover Color: “OPTIMA” Blue
Case Color: Light Gray
Group Size: BCI: 31
Internal Resistance: 0.0025
CA: 1125 Amp
MCA: 1125


  • No need for maintenance
  • Great for both starting and deep cycle
  • It is spill-proof
  • Resistant to vibration and shock up to 15 more times than conventional batteries
  • Comes with a reserve capacity of 155 minutes
  • Offers an optimal starting power even in bad weather


  • It is quite heavy as it weighs 59 pounds
  • Not the best warranty for such a quality battery

Vmaxtanks Vmaxslr125 AGM Deep-Cycle 12V Battery

Vmaxtanks is another quality brand with outstanding batteries. The Vmaxtanks Vmaxslr125 battery is one of the best AGM deep-cycle batteries. It is sturdily constructed for longevity and comes with a military-grade custom made plates. Additionally, this battery provides you with a float service lifespan of 8 to 10 years and has a lifespan of 10 years.

Read More about the Vmax Battery Review here

On top of that, the battery is created with 99% recombination capabilities and it doesn’t have gasses or fumes.  It is suitable for power inverters, wind turbines, and solar applications.

Technical Specifications of the Vmaxtanks Vmaxslr125 AGM Deep-Cycle 12V Battery:

Features Vmaxtanks Vmaxslr125 AGM Deep-Cycle 12V Battery
20Hr Capacity: 125AH
Nominal Voltage: 12V
RC (min): 260
Energy (kWH): 1.700
Terminal Posts: 8mm (included)
Charging Current: 8A-35A
Charging Voltage: 14.4-14.9V
Float Voltage: 13.5V-13.8V
Vehicle Alternator: 14V-15V
RV Converter: 14V-15V
Solar Panel: 175W-450W
Wind Turbine: 175W-450W
Charge Controller: 20-UP
Operating Temperature Range: Discharge: -4~140F
Charge: 14~140F
Storage: -4~140F
Temperature Compensation: Cycle use: -30mV/C
Standby use: -20mV/C
Weight: 75lb
Dimensions: 12.9″w x 6.8″d x 8.5″h(8.7″th**)


  • Great for storing solar energy
  • Longer battery life
  • Built with military-grade custom made plates
  • Features low self-discharge rate when utilized in stand mode for power backup
  • Durably constructed
  • One-year warranty


  • It stops holding the charge after a few weeks of use

Universal UB121000-45978 12V AGM Deep-Cycle Batteries

This is an outstanding battery as it is very easy to use and maintain. The Universal UB121000-45978 is an AGM deep-cycle battery that is non-sealable. This means that the battery doesn’t require any water throughout its lifespan. It can also be mounted in any position and no maintenance is required.

Read full reviews of the Universal Power Group Battery here

The battery is made in Asia and it is extremely reliable, more so in extreme weather conditions. Apart from that, it is both leak and spill-proof. You can transport it by air or road as it has no strict regulations.

Technical Specifications of the Universal Deep-Cycle Battery UB121000-45978:

Features Universal Power Group Battery- 12V 100Ah
20-Hour Capacity: 100AH
Standby Use: 13.6-13.8V
Cycle Use: 14.5-14.9V
Width: 6.61in
Length: 12.17in
Height: 9.16 in
Weight: 63.93 Lbs
Spill-proof battery: Yes
Rechargeable: Yes


  • It is maintenance-free
  • The Universal deep-cycle battery is leak and spill-proof
  • It has less than 3% per month standing self-discharge
  • The battery is valve regulated
  • Excellent design for a perfect deep cycle performance rating


  • A good number of users have complained that the battery doesn’t hold the charge

Mighty Max 12V 75Ah SLA Battery

The Mighty Max is another high-quality marine battery suitable for vessels. It is not on the high-end as most batteries on this list but offers one of the best performances. This battery is very easy to install and can be mounted in any position. Also, it is easy to maintain as no water or any other fluid is added. Other amazing features of this best marine battery include wide operating temperatures, deep discharge recovery, high discharge rate, and long service life.

Read More about the Mighty Max Battery Review here

With such features, a 30-day refund policy, and a 1-year warranty, this is an amazing scan tool to purchase for your boat.

Technical Specifications of the Mighty Max 12V 75Ah SLA Battery:

Features Mighty Max 12V 75Ah SLA Battery
Voltage: 12 Volt
Amperage: 75 AH
Chemistry: SLA, AGM
Weight: 50.71 Lbs
Warranty: Backed by a 30-day refund policy and full 1-year warranty


  • No maintenance is needed
  • Performs outstandingly in both high and low temperatures
  • It can be mounted in any position
  • Spill-proof battery
  • Resists shock and vibration
  • No need for adding water or fluids
  • Has a 30-day money-back guarantee and a 1-year warranty


  • None

Optima 8016-103 D34M BlueTop Marine Battery

If you’re looking for the best dual-purpose marine battery, then look no further than the Optima 8016-103 BlueTop marine battery. This battery can be used for starting or deep-cycle. Therefore, it is a dual-purpose battery.

Read More about the Optima d34m Review Here

In addition, it is 15 times more resistant to vibration for added durability. The battery is easy to install as its lightweight and can be installed in any position. Moreover, the battery has a reserve capacity of 120 minutes for constant performance. Even in bad weather, it will still hold optimal starting power. With cranking amps of 870 amperes, this is a great battery for your RV or boat.

Technical Specifications of the Optima 8016-103 D34M BlueTop Marine Battery:

Features Optima 8016-103 D34M BlueTop Marine Battery
C20 Capacity: 55 Ah
Nominal Voltage: 12 Volts
CCA: 750 Amp
Reserve Capacity @25 Amps: 120 Minutes
Case Material: Polypropylene
Cover Color: “OPTIMA” Blue
Internal Resistance: 0.0028
CA: 870 Amp
MCA: 870
Height: 7.94 in
Length: 10.06 in
Width: 6.88 in


  • It is 15 times more resistant to vibration
  • Performs well even in bad weather
  • Can be mounted in any position
  • Suitable for use on RVs or boats
  • It has a great reserve capacity of 120 minutes or great performance
  • Can be utilized for starting and deep-cycle


  • The battery can be damaged if overcharged

Interstate Batteries Sealed Lead Acid Deep-Cycle Batteries

For those who are tight on the budget but still want a reliable and sturdy marine battery, the Interstate sealed lead acid battery is a great choice. This is a deep-cycle battery that provides great power and lasts longer. It is easy to install as it can be mounted in any position and it is also compact and lightweight.

Read More about the Interstate Batteries Review here

Unlike some batteries, the Interstate battery can be transported by air, water, or road without any restrictions. Recharging this battery is not a problem as it recharges quickly. Always use the right charger to prolong its life. Also, it is maintenance-free and extremely durable.

Technical Specifications of the Interstate Deep- Cycle Battery – Seales Lead Acid:

Features Sealed Lead Acid (AGM) Deep Cycle Battery
Amp Hour Capacity: 35
CCA: 315 Amp
Chemistry: Sealed Lead Acid AGM
Voltage: 12 Volts/35 AH
Length: 7.75
Width: 5.2
Height: 7
Polarity: |+||||||-|


  • Can be mounted in any position
  • It is durable
  • This battery is maintenance-free
  • It charges quickly
  • The compact and lightweight battery


  • Several users have complained that it doesn’t hold the charge after some time

Odyssey 31M-PC2150ST-M Dual Purpose best Marine Battery

Featuring a great starting power and wonderful deep-cycle capability, up to 400 cycles at 80% depth of discharge, the Odyssey 31M-PC2150ST-M is a high-quality battery for RV and boat owners. It is slightly high-end but offers exceptional performance. Additionally, this dual-purpose battery provides 2 times the overall power and 3 times the life of traditional marine batteries.

Read Odyssey Marine Battery Review here

This outstanding deep-cycle battery with the highest recharge efficiency comes with great cranking power, which can defy deep and frequent depths of discharge without losing much power. Other amazing features include an AGM design that gets rid of acid spills, corrosion-resistant tin-plated brass terminals, a sealed design, and a high integrity terminal seal.

Technical Specifications of the Odyssey Dual Purpose Marine Battery- 31M:

Features Odyssey 31M-PC2150ST-M TROLLING Thunder Marine Dual Purpose Batteries
Ah 20 hr rate: 100
PHCA**: 2150
Voltage: 12 Volt
Reserve minutes: 205
Length: 13.00 in. (330.2 mm)
Width: 6.80 in. (172.7 mm)
Height: 9.39 in. (238.5 mm)
Weight: 77.8 lbs(35.3 kg)
Terminal: SAE and 3/8″ stud (pos) 5/16″ stud (neg)
Warranty: 5-year warranty


  • It has the highest recharge efficiency of any sealed lead battery
  • The battery is vibration resistant for longevity
  • It is spill-proof
  • High stable voltage for longer periods of time
  • Dual-purpose battery
  • The longer service life of 3 to 10 years
  • Great warranty of 3 and 4-year full replacement warranty


  • It is quite expensive

Optima batteries 8022-091 75/25 RedTop Starting Battery

The Optima Batteries 8022-091 RedTop high-performance battery is one of the best starting batteries that you’ll come across on the market. This battery is designed to provide a powerful burst of ignition power for a dependable start-up every time. The battery can defy hard corners and extreme launches.

Related: Optima d35 Review

Furthermore, it is proven to be an excellent automotive battery, truck battery, or boat battery. When it comes to cranking, this battery outperforms traditional batteries with its excellent high-power delivery and outstanding resistance to the usual causes of battery failure. It is maintenance-free, spill-proof, resists vibration.

Technical Specifications of the Optima D35 :

Features Optima d35 8040-218 Yellow Top battery, SC35DA
C20 Capacity: 48 Ah
Reserve Capacity @25 Amps: 98 Minutes
CCA: 620 Amp
Width: 6.75 in
Length: 9.38 in
Height: 7.69 in
Case Material: Polypropylene
Internal Resistance: 0.003
CA: 770 Amp
Cover Color: “OPTIMA” Yellow
Case Color: Light Gray
Group Size: BCI: 35


  • Has a reserve capacity of 90 minutes
  • Maintains optimal power even in bad weather
  • It is 15 times more resistant to vibration for durability
  • Strong starting burst
  • Recharges quickly
  • Spill-proof design
  • Can be mounted in any position


  • Complaints about the warranty and poor customer service

Vmaxtanks MR137 AGM Batteries

This is another outstanding battery from the Vmaxtanks brand. It is great for trolling motors and comes with a float service lifespan of 8 to 10 years. With this battery, you don’t have to add water to the battery tanks and there is no need of checking the particular gravity of the electrolyte. Therefore, this AGM battery is free of maintenance.

Apart from performing at a very high level, the Vmaxtanks MR137 AGM battery features durable and unique plates that boost the resistance against shock and vibration. It is also spill-proof and there are no chemical hazards. Thus, if you’re looking for a durable battery and with an excellent lifespan, this is a great choice.

Technical Specifications of the Vmaxtanks MR137 Deep-Cycle 12V Battery:

Features Vmaxtanks Vmaxslr125 AGM Deep-Cycle 12V Battery
20Hr Capacity: 120AH
Nominal Voltage: 12V
RC (min): 230
PHCA***: 1740A
Terminal Posts: 8mm (included)
Charging Current: 8A-35A
Charging Voltage: 14.4-14.9V
Float Voltage: 13.5V-13.8V
Vehicle Alternator: 14V-15V
RV Converter: 14V-15V
Solar Panel: 175W-450W
Wind Turbine: 175W-450W
Charge Controller: 20A-UP
Operating Temperature Range: Discharge: -4~140F
Charge: 14~140F
Storage: -4~140F
Temperature Compensation: Cycle use: -30mV/C
Standby use: -20mV/C
Weight: 75lb
Dimensions: 12.9″w x 6.8″d x 8.5″h


  • It is maintenance-free
  • Sturdy construction
  • It is resistant to shock and vibrations
  • Non-spillable design
  • 30 days money-back guarantee and a 1-year full warranty


  • It stops holding the charge after some time

Exide XMC-31 MEGACYCLE AGM-200 Marine Battery

The Exide MC-31 MEGACYCLE AGM-200 marine battery can be utilized for both starting and deep cycles. It provides outstanding performance with a 200-minute reserve capacity and an exceptional power rate of 1,110 CA at 32 degrees F and 925 CCA at 0 degrees F.

Read more about the Exide Marine Battery Review here

In addition, the battery is designed to resist vibration, 12 times more than a conventional battery. In case you receive the battery when it is damaged, you can return it and get a replacement as it comes with a 24-month free replacement warranty.

Technical Specifications of the Exide Marine Battery – XMC-31 MEGACYCLE:

Features Exide XMC-31 Marine Battery
Cranking Amps (CA): 1110 A
Cold Cranking Amps (CCA): 925 A
Capacity (20h): 100 Ah
Maximum 5s Discharging Current: 1400 A
Reserve Capacity: 200 min
Battery Terminals (Dual): 1:9 SAE Post
3/8″ – 16 Positive Stud
5/16″– 18 Negative Stud
Grid Alloy: Lead Calcium (both positive and negative)
Battery Type: Absorbed Glass Mat (AGM)
Warranty: 2 years Free Replacement Warranty


  • 200-minute reserve capacity
  • It provides 12 times more vibration resistance than traditional batteries
  • AGM separator is engineered for optimal recombination rates to prevent cell dry-out
  • A great starting power with a CCA rating of 1110 at 32 degrees F and at 0 degrees Fahrenheit
  • 2-year free replacement warranty


  • This battery is quite heavy
  • Complaints about receiving batteries that are more than 6 months old from the day of manufacturing. Ensure to check the manufacturing date.

Buying Guide for Marine batteries

To avoid landing a battery that doesn’t meet your needs and budget, it is important that you understand more about marine batteries. That’s why we’ve created this best marine battery guide to help you select a battery that is not only safe and ideal for your needs, but also a battery that will last and perform as you want it to.

Things to consider when buying a marine battery

Here are the factors to consider before buying the best marine battery of your choice:

Purpose of the battery

What do you intend to use the battery for? Do you want a battery for starting your speedboat or to power up the devices and appliances on your boat? Here, you will have to choose between a deep-cycle battery, starting or cranking battery, or a dual-purpose battery. A starting battery is for igniting the motor of a boat and normally ensures that you navigate and go full throttle or slow throttle with regards to instructions and design of the battery.

On the other hand, a deep-cycle battery provides energy and power to an electronic system within the boat. The more devices or appliances you have on the boat, the more power will be needed.  Finally, a dual-purpose battery performs both the roles of a starting battery and a deep-cycle battery. This is usually ideal for installing if you don’t have enough space for two batteries on board.

Reserve capacity rating

Reserve capacity is a measure of the total length of time that a fully-charged battery may provide 25 amperes of electrical current in a surrounding that is at least 80 degrees Fahrenheit in temperature, prior to being discharged to 10.5 volts. For example, a battery with a reserve capacity rating of 150 minutes can last for around two and a half hours while providing a load of 25 amperes. The battery with a higher reserve capacity is better than that with a low capacity for optimal performance.

Voltage rating

Voltage is the pressure that is created from an electrical circuit’s power source which pushes the charged electrons via a conduction loop, hence allowing it to perform some work. Boat batteries normally have voltage ratings of 12 volts, 18 volts, and 24 volts. The greater the voltage the better and different boats accommodate different battery voltages.

Manufacturing date

In simple terms, batteries are typically powered by stored chemicals whose potency reduces with time. As a result, the date the battery is manufactured is of great importance. Batteries that are still fresh are the ones that should be acquired. If a battery has been on the shelves for more than 6 months after its manufacturing date, then you should not buy it.


It is important you acquire a lightweight battery as you will be moving it in and out more often than you think. So, check on the weight of the battery before buying one.

Size and ease of installation

Different vessels use different types of batteries. Before buying a battery, ensure that it fits in place. But also, it should be powerful enough to start or power on the devices on your boat. Also, some batteries are challenging to install and will need an expert; while others are easy to set up and you can manage on your own.

Maintenance needs

Look for an easy to maintain battery as some are hectic and will take up most of your time. Some of the common maintenances that are undertaken include refilling the electrolytes, wiping the spillages, replacing worn out parts, and repairing dents.

Price and warranty

Last but not least, you also have to look at the price of the battery and warranty. A good battery should have a warranty and be from a reliable brand. Go through reviews before buying any marine battery. In addition, buy a battery that is within your budget range.

Types of marine batteries

There are three types of batteries that you have to choose from. These batteries have different energy output levels and they are quantified in amperes. They also vary in prices depending on the output and lifespan of the battery. These are as follows:

  1. Flooded batteries

These are the most common type of batteries on the market. They are also referred to as wet marine batteries. As the battery charges, the acid inside delivers off hydrogen and oxygen, which gets discharged through the vents. This type of battery is also the cheapest.

  1. Absorbed glass mat batteries

These batteries come with a glass mate separator, which is soaked in an electrolyte-acid solution. With these batteries, there is no need to worry about refilling with water, as the hydrogen and oxygen recombine to form water.

  1. Gel batteries

This type of battery performs using the mix of pure water, fumed silica, and phosphoric and sulfuric acid. With this type of battery, maintenance is easy and it’s not a must to keep the battery in an upright position. Furthermore, you don’t have to keep adding water, as the oxygen and hydrogen produced as the battery charges get changed back into the water.

Why do marine batteries fail?

  • Improper charging – all marine batteries come with their recharging specifications. Thus, if you intend to use the battery for a longer period of time, then you will have to adhere to those specifications.
  • Poor storage – the way you store your battery determines whether the battery will last long or not. Storing your battery without cleaning it exposes it to corrosion. Also, if you keep your battery without charging it fully, recharging it later can be quite challenging. Another important storage tip is that you need to observe the storage temperatures. The temperature should not be too high or too low.
  • Extreme temperatures – the temperature that the battery operates in is very crucial. It shouldn’t be too high or too low. If it’s very high, it can lead to increased discharge and electrolyte loss, while if it’s too low, the battery will discharge at a very lower rate than usual.
  • Using the battery for the wrong purpose – always ensure to use the battery for its intended purpose. If the battery is meant for starting up the engine or powering on appliances, you should stick to its use. Doing the opposite will only reduce the battery’s lifespan. Also, don’t replace a marine battery with a car battery.
  • Poor installation – always ensure that you install the battery as it is needed. A poorly installed battery may lead to acid leaks, accidental fires, and possible battery explosions. Also, loose cables and posts that are maintained poorly could as well reduce the battery’s lifespan.
  • Cell sulfation – A flooded battery spoils quickly if underused. When a lead-acid battery discharges less than 30% of its capacity, acid gathers on the lead plates as sulfate crystals, and when this occurs, the battery’s performance becomes greatly hindered. In the end, you will have to replace the battery early.

Final thoughts

Choosing the best marine battery can be a daunting task but you’ve to figure out what you need in order to land the best battery. Also, select a battery within your budget and it should be safe and durable to use. Hope our buying guide and reviews have made your work easier. The top 10 marine batteries that we’ve discussed above are some of the best and are worth spending your money on.


Q: What type of battery do I need for my boat or RV?

Answer: Marine batteries are normally created for either starting the engine or for powering up appliances on the boat. Starting or ranking batteries provide power for starting the engine, while deep cycle batteries are for powering up devices and appliances onboard. Therefore, it depends on what your needs are. Starter batteries are used for cracking and getting the engine running with a burst of cold cranking amps (CCA). They are recharged quickly by the alternator, but they’re not supposed to be discharged deeply as it could lead to damage. On the other hand, deep cycle batteries function to provide power over a longer period of time and can be discharged far more. They are recharged by shore power, generator or solar power.

Q: How does the CCA rating help in battery selection?

Answer: CCA in full means cold-cranking amps. It is the power that you can get from the battery, continuously, for 30 seconds and at 0 degrees Fahrenheit. The number shown by the rating refers to the number of amperes delivered. For example, a rating of 300 CCA means that the battery can offer 300 amps for 30 seconds when the temperatures are at 0 degrees Fahrenheit.

Actually, the higher the CCA rating, the better, as that indicates the battery s capable of cranking the engine when the conditions are tough, such as in cold environments.

Q: What is the standard lifespan of a marine battery?

Answer: The lifespan of a marine battery varies from one battery type to another. In most cases, marine batteries last between 6 and 8 years if it is heavily used. But if it’s not heavily used, it can last up to 10 years. If it is an AGM deep-cycle battery, it has the ability to last up to 8 years. While if it’s a cell battery, it can last up to 5 years or if you’re lucky, it goes for 8 years.

Q: Can a deep cycle battery start an engine? And do I need more than one battery?

Answer: Yes, it can but it depends on your engine and type of battery. Usually, deep cycle batteries provide less cold-cranking amps, but might still be able to start an engine with their current. Nevertheless, deep cycle batteries are not built for this purpose and you will only be wasting a good battery. So, if you don’t have room for two batteries on your boat, then you should go for a dual-purpose battery.

For instance, if you usually power up appliances on board, then you need at least a starter battery and a deep cycle battery. And if you have more power needs, you should increase the number of deep cycle batteries.


  1. This article is very helpful. There are a lots of important information on this web site for those who want to buy Marine battery. Reading the above information, I learned a lot about the battery. I like Optima battery. Looking forward to your new article.Thanks.


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