Marine Batteries

As a marine enthusiast, you surely own a boat you dearly care for. Therefore, you most probably already know the importance that a quality battery has for your experience when using the boat. It provides power storage and backup for the watercraft and the onboard appliances. To make your experience as pleasant as possible when using the boat for recreation or other purposes, we have done thorough research on marine vehicle accumulators. This way, you will not only get the chance to inform yourself on everything related to these cells, but you will have an easier time finding the right model for your needs as well.

Top 5 Marine Batteries Comparison

1. Odyssey 31-PC2150S 2. VMAXTANKS VMAXSLR125 3. Exide XMC-31 MegaCycle AGM 200 4. Optima Batteries 8016-103 D34M 5. VMAXTANKS VMAX857
BEST MODEL OUR CHOICE
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Product Specifications

Manufacturer Odyssey VMAXTANKS Exide Optima VMAXTANKS
Dimensions (L x W x H) 13″ x 6.8″ x 9.41″ 12.9″ x 6.8″ x 8.7″ 15.7″ x 13.9″ x 9.8″ 10.06″ x 6.88″ x 7.94″ 7.7″ x 5″ x 6.1″
Weight (pounds) 77.8 75 74.6 43.5 25
Voltage 12V 12V 12V 12V 12V
Plates Material Pure Virgin Lead Military Grade Alloys N/A Pure Lead-Tin Alloy Military Grade Alloys
Container Material ABS Plastic ABS Plastic ABS Plastic Polypropylene ABS Plastic

Performance

Type Starting/Crank Deep Cycle Deep Cycle Dual Purpose Deep Cycle
20Hr Nominal Capacity 100Ah 125Ah 100Ah 55Ah 35Ah
Group Size 31 31 31 34 U1
Cold Cranking Amps (CCA) 1150 1130 925 750 300
Pulse Hot Cranking Amps (PHCA) 2150 1875 1535 1245 500
Marine Cranking Amps (MCA) 1370 1410 1180 870 390
Service Life 3-10 Years 8-10 Years 5-8 Years 10 Years 8-10 Years
Reserve Capacity 205 Minutes 260 Minutes 200 Minutes 120 Minutes 75 Minutes
Operating Temperature Range -40°F to 113°F -4°F to 140°F N/A -40°F to 125°F Weatherproof
Recharge Time 4-6 Hours 12-24 Hours 6.5 Hours 6-12 Hours N/A
Life Cycles Recovery of 400 Cycles at 80% Depth of Discahrge Recovery of 600 Cycles at 75% Depth of Discharge N/A N/A 60% Depth of Discharge on 18-40lb Trolling Motors
Charging Options Any Charger or Alternator Smart / Microprocessor Controlled Charger; Alternator; Solar Panel; Charge Controller Solar Panel; Alternator; Any Charger Constant Voltage Charger Smart / Microprocessor Controlled Charger; Alternator; Solar Panel; Charge Controller
Typical Applications Cranking Battery for Starting Engines of Boats, Cars, Golf Carts, Vehicles; Deep Cycle Battery to Run Marine Unit and Onboard Vehicle Accessories N/A Deep Cycle Battery to Run Engines of Boats, Cars, Golf Carts, Vehicles; Marine Unit and Onboard Vehicle Accessories Starting Marine and High Power Vehicle Engines like Boats and RVs; Running and Powering Onboard Electronic Appliances Deep Cycle Battery to Run Engines of Boats, RVs, Cars, Vehicles, Golf Carts
Absorbed Glass Mate Technology

Features

Terminals SS 3/8″ Threaded Stud 8mm Hex Screw in Terminals 1/4″ Studs for Copper Terminals and SAE 5/16″ Stainless Steel Stud Posts and Dual SAE Dual Terminals with Hex Head Bolts
Shock and Vibration Resistance
Non-Spilling Design
Carry Handles

Warranty&Support

Warranty 4 Years 1 Year 2 Years 2 Years 1 Year
Online Support
User Manual

Maritime Batteries Reviews

1. Odyssey 31-PC2150S

The massive starting power provided by the Odyssey makes it one of the most sought-after products in its niche. It boasts a dual purpose profile which adds to its usefulness, and it belongs to group size 31, an aspect you must keep in mind to check if it is compatible with your boat. It can handle the most difficult tasks even in hash climatic conditions or when there are rapid vibrations due to its impeccable design. The recombinant technology it utilizes eliminates the need of refilling, so maintenance is out of the way with it.

Purpose

Due to the fact that it can be used as a cranking accumulator in order to start boat, cars, vehicles, golf carts, and recreational engines, as well as used for deep cycling applications like running onboard accessories like GPS systems, fish finders, and more, this cell is considered a dual purpose model. This means that you are granted a higher versatility in use, not being limited when it comes to its functionality.

Lifespan

This product is backed by a 4-year warranty on engine starting applications, this lengthy protection offered by the manufacturing company serving as proof of the overall quality it boasts. The 3 to 10 years of service life it is rated to deliver make it exceed industry standard, helping save you money, time, and aggravation in the long run. When it comes to shelf life, it can be stored on open circuit for up to 2 years without needing to be recharged. Furthermore, it provides up to 400 cycles at an 80% depth discharge, which is approximately 70% more than what most conventional accumulators deliver.

Mention Worthy Features and Specs
  • Non-spilling design allows a high mounting flexibility versatility.
  • Pure virgin lead plates ensure lover service life and heavy-duty cycling.
  • It is able to recover up to 400 cycles at 80% depth discharge.
Resistance

Obviously, a long lifespan can only be delivered by a resistant design, and the Odyssey delivers just that as it is manufactured to resist high impact shock and mechanical vibrations. Seeing how these two elements are the common causes of premature cell failure, you can breathe easy knowing you won’t go through this degradation process with it. Another trait that adds to its resistance is the non-spill design which allows you to mount it in any position without worrying acid might come out of it. Additionally, it can safely operate in temperatures ranging from -40 degrees Celsius or -40 degrees Fahrenheit to 45 degrees Celsius or 113 degrees Fahrenheit without the jacket on, and with the jacket on it can even go as high as 80 degrees Celsius or 176 degrees Fahrenheit.

PROS CONS
  • Ideal 100Ah 20-hour nominal capacity
  • Service life of up to 10 years
  • Recharge time of approximately 4-6 hours
  • Can be used with any type of alternator or charger
  • Generous 4-year warranty
  • There are no downsides to this product
VERDICT

With a reserve capacity tough to surpass and recharging faster than you would ever expect, it is easy to see what makes it our top recommendation to boat aficionados. Its versatility is quite expanded in terms of charging manner, and, if properly taken care of and used, it lasts for up to 10 years. Overall, there are no flaws we could find, so for the sake of your boat, we advise you to use it.

2. VMAXTANKS VMAXSLR125

The VMAXSLR125 comes with military grade alloy plates, and the container that it features is made of ABS plastic. This deep cycle model weighs 75 pounds. It boasts a 20-hour nominal capacity of 125Ah, meaning that it will offer a reliable performance to those who choose it. It belongs to the 31 group size and it has an impressive service life of 8-10 years.It provides 1130 cold cranking amps, 1875 pulse hot cranking amps, and 1410 MCA. Another aspect that has impressed us is its 260-minute reserve capacity. To recharge it, you have to wait between 12-24 hours and you can use a microprocessor controlled charger, an alternator, or a charge controller.The fact that it features the absorbed glass matte technology shows it is resistant to shocks and vibrations. It features 8mm hex screws in its terminals. The carry handles it comes with allows for easy maneuvering and placement. In addition, it is covered by a 1-year warranty.

PROS CONS
  • Reserve capacity rating of 260 minutes
  • Belongs to group size 31
  • Recharge time ranges from 12 to 24 hours
  • Features the absorbed glass mate technology
  • Features convenient carry handles
  • Short warranty – only 1 year
VERDICT

As the only negative comment we have about it is that the accompanying warranty is not the lengthiest out there, we understandably back this deep cycle model and recommend it. Among its notable highlights stand the fast charge time, the lengthy 10-year service life, and the 260-minute reserve capacity, along with its reasonable asking price, of course.

3. Exide XMC-31 MegaCycle AGM 200

The XMC-31 is a deep cycle model which comes with an ABS plastic material for the container, weighing a total of 74.6 pounds. It has a 20-hour nominal capacity of 100Ah and it belongs to the 31 group size. It provides 925 cold cranking amps, 1535 pulse hot cranking amps, and 1180 MCA.

It has an impressive reserve capacity of 200 minutes. If it is being handled properly, it will provide a service life of up to 8 years. It takes about 6 and a half hours for it to recharge, and you can use an alternator or any charger for this task.

It comes with a carry handle which allows you to place it where you need with ease. Due to the fact that it features the absorbed glass mate technology, it is shock and vibration resistant. It features 1/4″ studs for copper terminals and SAE. When it comes to warranty, it is backed up for 2 years by the manufacturer.

PROS CONS
  • Large acid container retains more power and provides faster charging times
  • Belongs to group size 31
  • Lifespan of up to 8 years when it is in service
  • Designed to tolerate knocks and strong vibrations
  • Allows charging from all chargers, alternators, and even solar panels
  • Slightly more expensive than similar maritime accumulators
VERDICT

A deep cycle model worth your money as it boasts a long 8-year service life when used under proper conditions, the XCM-31 is a must-have for any boat owner. It is designed to take a “beating” as it is shock and bump resistant at a higher level than what this niche has accustomed us with. Furthermore, as opposed to most deep cycle models, it is backed by a lengthy 2-year warranty that you can take full advantage of.

4. Optima Batteries 8016-103 D34M

The D34M is a dual purpose model that weighs only 43.5 pounds. The material of its plates is pure lead-tin alloy, the container being made from polypropylene. It has a 20-hours nominal capacity of 55Ah and it belongs to the 34 group size.

It provides 750 cold cranking amps, 1245 pulse hot cranking amps, and 870 marine cranking amps. It boasts an impressive service life of up to 10 years. The recharge time is between 6 and 12 hours, and you can use a constant voltage charger or an alternator for this task.

It is shock and vibration resistant due to the fact that it features the absorbed glass mate technology. Also, it is backed up by the manufacturer for no less than 2 years.

PROS CONS
  • Dual purpose design makes it versatile in use – can be used as a deep style or cranking accumulator
  • Quick recharge time ranging from 6 to 12 hours
  • Non-spilling design lengthens its lifespan and enhances safety in use
  • Features high-quality pure lead-tin alloy plates
  • Lightweight design – weighs only 43.5 pounds, so it is easy for you to maneuver it
  • A bit expensive when compared to similar products
VERDICT

If you are on the hunt for a versatile boat cell, look no further than the D34M as this dual purpose accumulator perfectly plays two roles as it can be used as either a cranking or deep cycle battery. Sure, it does come at a spicier price than what you have grown accustomed to, but considering its multi-use design, its tag becomes understandable.

5. VMAXTANKS VMAX857

This is a deep cycle model that weighs just 25 pounds, making it the lightest in our top. The plates are made from military grade alloys, and the container is made of ABS plastic. It has a 20-hour nominal capacity of 35Ah, and it belongs to the U1 group size. It provides 300 cold cranking amps, 500 pulse hot cranking amps, and 390 marine cranking amps.

It boasts an impressive service life of 8-10 years if it is properly taken care of. It is weatherproof, which means that it does not have an operating temperature limit. It has a reserve capacity of 75 minutes.

The charging options for it are a microprocessor controlled charger, an alternator, or a charge controller. It is shock and vibration resistant due to the absorbed glass mate technology it comes with. It features dual terminals with hex head bolts. Also, it is backed up by a 1-year warranty.

PROS CONS
  • Weatherproof design makes it withstand any temperature without damage being received
  • Pulse hot cranking amps rating of 500
  • Enhanced shock and vibration resistance prolongs its lifespan
  • Comes at a great, affordable price
  • Belongs to group size U1
  • Inferior reserve capacity of only 75 minutes
VERDICT

By definition a bang for your buck, especially considering the fact that it comes at a cheap price, this maritime accumulator has impressed us with its long 10-year service life and weatherproof design which ensures it will work perfectly regardless of the temperature. However, there are downsides to it, especially if you compare it side by side to other deep cycle models on the market, as it does not deliver the best reserve capacity nor CCA and MCA ratings.

6. Odyssey PC680

Providing up to 400 cycles at an 80% discharge, the PC680 presents you with a long-lasting accumulator that offers power to your boat and onboard accessories for years on end. As it is capable of fully recharging in only 4 to 6 hours, its efficiency is undeniable. Due to the fact that it boasts the AGM technology, you will be able to mount it in any position you like as there are sure to be no acid spills.One of its traits that add to its efficiency and make it a popular option is the fact that it provides up to 15% more plate surface area. As there are no dead spaces between the cylinders of the accumulator, it provides more reserve capacity than other options do, more precisely a hefty 24 minutes. It is designed to be shock, vibration, and corrosion resistant so that it will serve you for as long as possible.Due to the fact that this dual purpose model boasts a lightweight design, you will have no trouble mounting it on your own. Additionally, the manufacturing company offers for it a 2-year warranty. Sure, it might not be as lengthy as what Odyssey offers, for example, but it’s more than enough considering that this product comes at a reasonable price as well.

PROS CONS
  • Offers up to 400 discharge/recharge cycles at 80% depth of discharge
  • As it is tolerant of extreme temperature conditions, it provides a lengthy lifespan
  • As it delivers a complete mounting flexibility, you can install it in whatever position you want
  • Best-selling product on the market
  • Comes at an affordable price
  • Not the best CCA rating out there – only 170 amps
VERDICT

If your main interest is to have an accumulator which provides a lengthy service time, than the PC680 is what you need. Not only can it service you for up to 10 years, but it comes at a reasonable price and withstands extreme temperatures like a pro.

7. DieHard 38188 Group 34R

This Group 34R model is ideal for maritime applications as it is designed to withstand extreme temperatures, high vibrations, and deliver power to even the most demanding on-board accessories. It comes at an affordable price, and due to the fact that it delivers a long service life, it spares you of making new purchases any time soon.It boasts a maintenance-free design that makes it ideal for forgetful people. It is rated 775 for cold cranking amps, and 120 minutes for the reserve capacity. As it features a boosted electrolyte suspension system, it is able to absorb more electrolytes in order to provide protection to internal components.What makes us so confident in its long service life and great power output is the fact that it features the full plate AGM technology. Furthermore, the manufacturing company warrants it for 3 years since the purchase date, which shows that this is a trusted product with a fine design and construction.

PROS CONS
  • AGM design ensures it withstands the high power demands of accessories and elevated temperature conditions
  • Spill proof and maintenance free design
  • Can be mounted in any position you need
  • There are 4 other group size options to choose between – Group 34, Group 35, Group 48, Group 49
  • Free replacement warranty is available for 3 years since the moment of purchase
VERDICT

The safeguards it has in place to ensure a high protection against vibration ensures it will serve you for many years. Balancing its long service life and the affordable asking price, it’s safe to say that this is one of the best acquisitions you could make.

8. Exide Edge FP-AGM24DP

This is a dual purpose model designed to be used for both cranking and deep cycle and it is suitable for cars and marine as well. The Cold Cranking Amperage is 775, which is not so much compared to more powerful accumulators but it is enough to get it started.

FP stands for the flat plate design that consists of six sets of plates separated by glass mats arranged in a straight line. It is robust and designed to last, with a non-spill AGM construction which ensures maximum safety in use. It features a strong starting and staying power that keeps it running like new each day.

Being a deep cycle model makes it more resistant to higher cycling and more efficient while recharging. Thanks to the SureLife Graphite technology, you can rest assured knowing it will yield highly on water.

PROS CONS
  • AGM technology ensures a maintenance-free operation
  • High durability granted by the Surelife graphite technology it features
  • Dual purpose design recommends it for deep cycling as well as cranking purposes
  • Dry cell design ensures a spill-proof environment – can be mounted in any position
  • Recombinant technology does not require distilled water refilling
  • Cold cranking amperage of 775 makes it less powerful when compared to other dual purpose models
VERDICT

As the Exide Edge is intended for deep cycle as well as cranking applications, it provides the versatility many boat owners are yearning for. Furthermore, the good asking price makes it all the more appealing, cancelling out its flaws, especially for those who are not looking to make a hefty investment.

9. Mighty Max ML35-12

A maintenance-free product which is not only zero hassle but that comes at an unexpectedly cheap price, the ML35-12 is one of your best solutions as a boat owner. Designed to be used for trolling motors, it measures 7.68 inches by 5.16 inches by 7.13 inches. Its spill proof design makes it outstanding in terms of durability.

You can mount it in any position you desire or is needed. Unlike other accumulators, it is intended for use in float as well as cyclic applications. Furthermore, it perfectly withstands shock and vibration, so you need not worry that these two elements might produce any damage.

Lastly, the manufacturing company, Mighty Max Battery more precisely, offers a full 1-year warranty on this product, as well as a 30-day money back guarantee. Thus, if anything happens during this trial period or you are simply unsatisfied with it, you will receive your entire investment back from the manufacturer if you return it.

PROS CONS
  • One of the cheapest entries on this market
  • Long service life which ensures this is not an investment you will regret making
  • An AGM model which boasts a valve regulated design
  • Can perfectly withstand any shock or vibration thrown its way
  • Maintenance-free design makes it no hassle to use it
VERDICT

If money is an issue for you, but you still want a maritime accumulator which will serve you for years, this is your go-to option for sure. Designed to withstand the harshest of conditions, and boasting a long service life which is granted by its absorbed glass mat technology, you will not regret purchasing it.

Maritime Accumulators 101 – Getting Acquainted


If you are not an expert in the field of boat batteries, you have definitely come to the right place. Here, we have broken down all you need to know about the accumulators, their most important particularities, and elements, making it easy for you to understand them. So, in case you want to know more about them, we have gathered here below some useful information about the boat accumulators that will surely help you learn more about them.

  • Technology

    The technology refers to the chemistry, electrolyte medium, and conduction medium of the accumulator. Based on these elements, there are four basic types of maritime accumulators, more precisely AGM, flooded, gel, and lithium-ion batteries.

  • The glass mates of AGM accumulators are absorbed with electrolyte, being placed between the lead plates. As the electrolyte saturates the glass mate, it allows water to form internally by recombining the oxygen with the hydrogen gas. These cells require the least maintenance, they are highly resistant to shock and vibration, and their self-discharge rate is extremely low as well.
  • Flooded accumulators are better known as wet-cell batteries. Each wet-cell is composed of a mixture of distilled water and sulfuric acid. What makes them the preferred choice of many people is the fact that they come at relatively cheap prices. Best of all, they do not sacrifice quality despite their price tag, being highly resistant to overcharging and overheating, and providing reliable service for a long time due to their durable construction.
  • Gel models resemble flooded batteries in the sense that they are both filled with liquid electrolyte. What differentiates them is the fact that the liquid electrolyte contains silicates, giving it a gel structure. They do not require any maintenance work due to the fact that they are sealed, they can withstand high overcharging, heavy shock, and heavy vibrations. Also, they tolerate extremely low temperatures.
  • Lithium-ion maritime models are a newer arrival on the market, this being the reason why despite their increased safety and reliability, they have not managed to surpass other types of accumulators in popularity. They feature power control to prevent the possibility of an accidental overcharging, they are maintenance free and environmentally friendly, their automatic features protect them from short circuit, low voltage, or reverse polarity, and they offer a deep discharge depth as well.
  • Application

    Based on the tasks the accumulators can perform, they are separated into three different application categories, which are starting/cranking, deep cycle, and dual operation.

  • Starting/cranking accumulators crank the starter of the boat’s engine, being the sprinters of the electrical system. They are able to deliver a maximum of 400 amperes for up to 15 seconds, afterward being recharged by the alternator of the engine. Their construction consists of alternating layers of negative and positive plates that are insulated.
  • Deep cycle batteries are able to power the electrical loads on the boat when there is no charging source available. Basically, they store energy and wait for it to be used. After being put through intense use, they completely recover due to their ingenious design that features thick plates with a high content of antimony. It is their impressive performance which makes them fan favorites, even our ranking of the finest accumulators out there consisting of no less than 3 products of this kind.
  • Dual purpose models have large, thick plates that contain a high amount of antimony. What makes them a great choice to go with is the fact that they can tolerate extreme deep discharges, being perfect for use in powerboats that use a single accumulator for starting and running loads when the engine is turned off, and boats which feature a bank that performs double duty for engine starting and home applications.
  • Charging

    Boat accumulators are unbelievably pretentious when it comes to charging. The consumed energy has to be put back immediately, or else it will sulfate, this being the moment when the performance and longevity decrease. Just be careful what you use to recharge them because these batteries have different charging options. For example, our top picks have the alternator as a common charging option, but they can be charged using other methods as well.

How It Helps Improve Sailing Expeditions


You might wonder what is the importance of finding a great accumulator to use on your boat, not fully understanding what difference its quality makes. If this is the case, we advise you to read this section to find out what advantages are brought by the top batteries like the ones that feature in our ranking.

  • Durability

    The most reliable accumulators out there boast a design that makes them more durable when compared to other models on the market. This means that they are an investment worth making, providing a long service life which ensures you won’t go shopping for another accumulator for a long while.

  • Low Maintenance

    Another important advantage is the fact that the batteries require little to no maintenance. These accumulators are AGM, lithium, and gel models, being the least pretentious due to the fact that their design prevents spills and terminal corrosion. A perfect example of a cell which does not require much in the way of maintenance is the Optima Batteries 8016-103 D34M, which is one of our top choices.

  • Resistance

    Of course, vibration and shock resistance are other aspects worthy of consideration, the finest accumulators on the market boasting a high resistance to them. This means that they are less likely to get damaged, providing users with a reliable and constant top-notch performance, no matter what they are put through.

Noteworthy Features and Specs Exaplained


Knowing how important it is for your boat to use a great battery, we have put together this buying guide. After reading it, you will know what to look for in order to choose one of the best accumulators out there, enjoying a reliable performance due to the purchase you will make. So, let’s see which are the most important aspects to consider when you decide to buy a reliable maritime accumulator that won’t let you down.

  • Purpose

    Before you hurry to make a certain purchase, you first have to consider the purpose of the boat accumulator. For example, if you plan on simply using it to crank the boat, you need a certain type of accumulator, while if you want to crank the boat and run onboard appliances, you have to go with another type of accumulator. The purpose that you need it to have will show you if you must go with a starting/cranking, a deep cycle, or a dual purpose model.

  • Reserve Minutes

    The reserve minutes show for how long it can sustain a 25 amps load before it drops to 10.5V at 80°F. The longer, the better when it comes to this aspect, meaning that you must choose an accumulator with a long reserve capacity, like the 260 minutes offered by the VMAXTANKS VMAXSLR125.

  • Amp-Hours Capacity

    The Amp-hours measure how much energy it can deliver over a 20 hour period at a constant rate of discharge until the voltage reaches 10.5V. To ensure you are making the right choice, go with an accumulator like the Exide XMC-31 MegaCycle AGM 200 which has a capacity of 100Ah.

  • CCA and MCA

    CCA and MCA are power measurements you can guide yourself after to determine whether you have your eyes set on a quality accumulator or not. They show the amount of amperage it can provide for 30 seconds to maintain a minimum of 7.2V at a certain temperature.

  • CCA, better known as cold cranking amps, show the amount of amperage it provides over a period of 30 seconds in order to maintain a minimum voltage of 7.2V at a temperature of 0°F.
  • MCA, known as marine cranking amps, show the amount of amperage it provides for 30 seconds in order to maintain a voltage above 7.2V at a temperature of 32°F.
  • Longevity

    Of course, you have to consider the longevity of the accumulator as well. Longevity refers to its cycle life, showing how many discharge cycles it provides over its lifespan. From this point of view, deep cycle models are superior to starting/cranking models due to the fact that they can cycle repeatedly, meaning that they last for a longer period of time. To measure the longevity of the accumulators they sell, the manufacturers discharge the full batteries at a temperature of 80°F until their voltage reaches 10.5V. Afterward, they are recharged, the process being repeated until the accumulators fail to hold half of their rated capacities.

Maintenance Tips for Performance Enhancement


No matter the quality of the accumulator you purchase, it won’t last for long if you do not take proper care of it and if you do not use it under appropriate conditions. Therefore, make sure you comply with the maintenance procedures of these cells in order to perform at their highest capability for as long as possible.

  • Tip #1 – Do Not Reuse Old Batteries

    Never mix in the bank old accumulators with the new ones that you buy. You might be tempted to think that this is a good idea because it will increase the overall capacity, but in fact, you are just harming the new batteries that you have bought. This happens because the old cells do not perform as well as they did, deteriorating the new ones too.

  • Tip #2 – Remember to Clean It

    What you must never forget is that cleaning is occasionally required. When dirt gathers on top of it, take a cloth and wipe it off. Also, as soon as corrosions appear on the terminals of the cell, handle them by using a wire brush post cleaner. By doing this, you extend the lifespan of the accumulator, and you maintain the constant and powerful flow of electricity that the boat needs.

  • Tip #3 – Pay Attention to the Charging Recommendations

    Without a doubt, charging is the most important maintenance task you have to do in order to keep the accumulator up and running for a long time. First of all, make sure you respect the recommended number of hours for recharging the specific accumulator you choose. Also, do not forget to recharge it immediately, especially if it has been stored separately or the boat has not been used for a long time.

  • Tip #4 – Check It for Cracks and Bulges

    No matter the type of accumulator you go with, make sure to occasionally check it for cracks and bulges. If these problems do arise, it means that either the alternator of the boat has a problem or the charger is overcharging it.

How to Install a Boat Accumulator

Although it might sound complicated to install a new accumulator in your boat, it is a fairly easy procedure even for those who have not dealt with these kinds of tasks before. In case you have installed a car accumulator before, you will find it a lot easier to install a boat accumulator as well, the whole task taking less time. Nonetheless, regardless if you are experienced or not, it is still a chore that you will surely be able to perform.

First, you need to buy a high-quality accumulator and check if you have a box as well. In case you do not already have one, buy it as it is important because it protects the battery from the elements. For the procedure, you need two wrenches that you will use to remove the connections of the old accumulator and install the new one. Also, you should have a small container of vaseline with you as it comes in handy for greasing the terminals of the accumulator.

To replace the old accumulator with a new one, locate it and switch it off. Disconnect the cables, proceed to lift it out of the box, and store it somewhere safe. Now that the old one is out of the picture, you must check the terminals of the maritime accumulator that you have bought to ensure they provide a reliable connection. Apply a small amount of vaseline to these terminals and reconnect the cables while making sure no loose cables remain in your way. Use a wrench to check for the cables to be firmly attached to the terminals of the accumulator, and place the lid back on the accumulator box.

After installing it, it is time to check if the installation has been successful and if the accumulator works. Switch the accumulator’s power on and turn on an electronic device that uses it as a source of power. If the electronic device works, it means that the installation was a success, and you can start the boat to sail off with it. If it does not work, check the whole procedure again to make sure the cables are well connected to the terminals.

Proper Winter Storage Tips and Advice


As soon as winter makes an appearance, you stop using the watercraft that you own. The long winter nap that the boat is passed through inevitably affects the maritime accumulator if you leave it inside instead of properly storing it. To make sure that when spring comes and you want to take the boat for a ride you won’t be confronted with the awful situation of having to replace the accumulator because it is dead, we have written this section of the article where we will explain proper storing during winter.

  • Disconnect and store – As we have already said, leaving it inside the boat throughout the cold season, when the watercraft is not used, is going to lead to the accumulator’s decay. What you should do is to disconnect it to make sure that not even the smallest power depletion does not occur during this period of time. After disconnecting it, you can proceed to store it properly, more precisely in a dry and safe space. What we recommend is you store it in the garage if you have one, or in a storage facility. Just make sure that where you do place it the temperature won’t fall below the freezing point.
  • Avoid corrosion by cleaning and drying it – Although it might be advertised as being highly resistant to corrosion, you should not take any chances as corrosion can appear on the terminals. To avoid corrosion, you should clean it with a mixture of baking soda and water after you take it out of the boat. Make sure you rinse it with clean water and that you wipe it dry before placing it in the storage space chosen for it. The composition of the cleaning solution will neutralize any acid that lays on the case. Also, it will help remove any existing corrosion.
  • Do not forget to recharge once per month – An unused boat battery can deteriorate a lot faster than one that is regularly used. As it takes a break, the chemicals inside it react, which causes it to self-discharge. The rate at which it discharges depends on its type and temperature, so there is no way to indicate how it actually occurs for all accumulators. What we can say for sure is that discharge and the destruction of the accumulator can be easily avoided by recharging it once per month. When you are charging it, do not allow it to overheat or overcharge as you could actually cause more harm than good.

Manufacturers Worth Buying From


Certain brands become important names on the market that they activate in as they deliver only high-quality batteries to customers. Therefore, a great principle to base your search on when looking for a top of the line accumulator is the brand that manufactures it, a renowned and trusted producer most likely delivering products that are worth your money.

  • Odyssey

    Odyssey is one of the most respected brands on the market, offering nothing but the best quality boat accumulators out there. Odyssey products are manufactured by EnerSys, which is a global leader in stored energy solutions for industrial, military, and automotive applications. Now that you are aware of what actually stands behind the manufacturing process of some of the finest cells on the market, like the Odyssey 31-PC2150S, it is easy to understand why this brand is worth your attention.

  • VMAXTANKS

    VMAXTANKS is a brand that solely focuses on the production of high-end cells which deliver impressive performance while requiring minimum maintenance and maintaining a good value. Nonetheless, what makes this brand stand out from its competitors is the fact that it uses only superior quality materials in the production process, meaning that the cells they sell will surely last for a long time.

  • Exide

    Another reliable name in this industry is the Exide brand that has been dedicated to manufacturing high-quality accumulators for a long period of time, namely since 1888. One of the main purposes of the company is to help their customers achieve great results by using innovative accumulators. Also, the brand is well-known around the world, being the first choice for many people. Furthermore, they offer great customer support for all those who want any additional information.

  • Optima

    Optima is a brand that has been around for a little over 40 years, during this period of time bringing impressive innovations. Among the most notable achievements of this brand stands the fact that it was the first to introduce maintenance-free lead-acid accumulators. Also, in the past decade, the brand has managed to impress people by producing the first digital cell charger and maintainer.

Putting Together a Rating System


In order to enjoy nothing but the best quality batteries, we have looked for certain elements when ranking the products we chose as being top tier. For you to have a better idea on how our ranking process works and why we make certain choices, we have written this section where we explain what’s behind our ratings.
  • 20Hr Nominal Capacity

    The 20-hour nominal capacity of a marine cell shows the number of amps it can deliver over a period of 20 hours. In order to establish what models deserve our attention and to figure out how exactly to rank them, we took this aspect into consideration. This is the reason why our top picks are the Odyssey 31-PC2150S, VMAXTANKS, VMAXSLR125 and Exide XMC-31 MegaCycle AGM 200 providing at least 100Ah when it comes to their 20-hour nominal capacity.

  • Cold Cranking Amps

    The cold cranking amps represent how much amperage it provides for 30 seconds in order to maintain a minimum voltage of 7.2V at 0°F. Knowing that a bigger amperage shows a better quality, we could not overlook the Odyssey 31-PC2150S and the VMAXTANKS VMAXSLR125 when making the final choice. The accumulator produced by Odyssey boasts an impressive CCA of 1150, while the model that Exide manufactures, provides 1130 when it comes to CCA.

  • Pulse Hot Cranking Amps

    The pulse hot cranking amps show how much amperage it can provide over a short duration high rate discharge. To figure out the PHCA of certain models, we have multiplied the CCA they offer by 1.66. This is the formula you can use to find out the PHCA of any accumulator out there that does not specify it.

  • Marine Cranking Amps

    The MCA show how much amperage it produces for 30 seconds to maintain a voltage of at least 7.2V at 32°F. Just like in the case of cold cranking amps and pulse hot cranking amps, the bigger this amount is, the better. Of course, our top picks, the Odyssey 31-PC2150S, and the VMAXTANKS VMAXSLR125 both have an impressive MCA rating, reason why we had to rank them higher than other accumulators.

  • Reserve Capacity

    When rating the accumulators we consider as being the best out there, we have taken a close look at their reserve capacity as well. The reason why reserve capacity is of a great importance is that it shows how many minutes it takes for the accumulator to discharge up to 10.5V by 25 amperage discharge at a temperature of 80°F.

  • Recharge Time and Options

    Time is of the essence these days, this being the reason why we had to rate the batteries according to their recharge time and options. All of the entries in our top can be recharged using an alternator and other charging options. Also, the recharge time influenced our ranking, this being the reason why the Odyssey 31-PC2150 is our top choice, completely recharging in a maximum of 6 hours.

When being on the water is what relaxes you the most, you feel the need to spend as much time as possible on your boat. However, the difference between a smooth ride and a horrifying one can be made by one sole part – the battery of the aquatic vehicle. Taking the number one spot on our top, the Odyssey 31-PC2150S is the most trustworthy product to go for. This starting and cranking cell belongs to the group size 31, and it boasts a long service life of up to 10 years, thus granting that you will recuperate your investment in it. The model that we must admit drew our attention the most was the VMAXTANKS VMAXSLR125 which utilizes the absorbed glass mate technology that ensures a long and reliable service life, and that provides an outstanding reserve capacity rating of 260 minutes. If we were to recommend the best accumulator in terms of pricing, however, our pick would definitely be the VMAXTANKS VMAX857. As you have probably already concluded on your own, it is one of the cheapest high-end options to go for. Furthermore, it does not shy away from delivering a reliable performance, and its shock and vibration resistance makes it a long-lasting investment too.

Frequently Asked Questions



?What do CCA and MCA indicate?
CCA is a rating which indicates the amperage provided by the accumulator over a 30-second period of time to maintain a constant 7.2 voltage when the temperature is at 0 degrees Fahrenheit. MCA is a rating which indicates the amperage required for a 7.2 voltage to be maintained at a 32 degrees Fahrenheit temperature over a 30-second period of time.

?Why does my cell bulge?
If when you last inspected the accumulator you noticed that it has bulged, it might mean that the alternator has a problem which is directly affecting it, or that the charger is overcharging it. Check to see what is the issue and fix it as this problem can lead to the demise of the accumulator fast.

?Does over-discharging affect the accumulator’s quality and lifespan?
Yes, over-discharging does take a toll on the lifespan and responsiveness of the battery. During discharges deeper than 50 percent, the cycle life of the cell if dramatically shortened, thus its service life decreasing as a direct result.

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