Best Deep Cycle Marine Battery Reviews

Best Marine Battery (Deep Cycle) Reviews 2021|Buying Guide

When it comes to navigating, choosing the best marine battery (deep cycle or Agm) is undoubtedly the most important thing you should keep in mind while ordering your marine supplies. So without further ado, first thing first.

Top 5 Editor's Pick

Odyssey 31M-PC2150ST-M Trolling Thunder Marine Dual Purpose Battery
Odyssey 31M-PC2150ST-M Trolling Thunder Marine Dual Purpose Battery
  • 75 lbs
  • 100 AH capacity
  • CCA,Longer cycle life, 4 years full replacement warranty
Optima Batteries 8040-218 D35 YellowTop Dual Purpose Battery
Optima Batteries 8040-218 D35 YellowTop Dual Purpose Battery
  • 36.4 lbs
  • 48 AH capacity
  • 98 minutes reserve capacity for constant performance
Optima Batteries 8006-006 34M BlueTop Marine Starting Battery
Optima Batteries 8006-006 34M BlueTop Marine Starting Battery
  • Weight 38.4 lbs
  • Capacity 232 AH
  • SAE Terminal,2 Years Warranty
Mighty Max Battery ML35-12 - 12V 35AH U1 Deep Cycle AGM Solar Battery Replaces 33Ah, 34Ah, 36Ah Brand Product
Mighty Max Battery ML35-12 - 12V 35AH U1 Deep Cycle AGM Solar Battery Replaces 33Ah, 34Ah, 36Ah Brand Product
  • Weight 22.5 lbs
  • 35 AH Capacity
  • SLA rechargeable maintenance free battery with 12 months warranty

No doubt, preparation is everything .Summer is here. You are planning a massive event for all your friends. Going into the day, you research the best deep cycle marine battery to make sure your boat is up and going for the party.

The day has arrived; your guests are gravitating towards the boat. You then notice your neighbor struggling to get his start—the battery is dead.

Waving him over to join your group, you take the opportunity to tell him what you have learned.

Today we’re reviewing the most optimum deep cycle marine batteries available in the market. We will analyze the best dual purpose marine cranking power amps features and highlights they have to offer.

What is The Best Deep Cycle Marine Battery in 2021?

Not sure what type of deep cycle boat marine battery you want? Don’t worry! Here, we have a list of the top 12 best-reviewed for your vehicle to use. We will be analyzing the features and characteristics that make these deep cycle marine batteries the best to buy.

1. Odyssey 31M-PC2150ST-M TROLLING Thunder Marine Dual Purpose Battery

Odyssey 31M-PC2150ST-M TROLLING Thunder Marine Dual Purpose Battery

The Odyssey battery 31M-PC2150ST-M is probably the best dual purpose marine deep cycle battery that has great starting power. More so, the unit is amazingly capable of deep cycling tasks. It surpasses the other batteries by offering double the total power and tripling the lifecycle of a conventional marine deep cycle battery.

As the name says, you know what this battery is ideal for. Apart from trolling, the it also excels at starting and deep cycle powering onboard electronic components that boats plus recreational vehicles often have. Using this battery, you can expect to achieve up to 400 cycles at an eighty percent depth of discharge, providing the dual-purpose battery with strong qualities not many batteries can offer. It generates a highly stable voltage for a longer period of time, enhancing the engine’s performance.

It also offers high recharge efficiency, beating most sealed lead-acid batteries currently around the markets. The dual purpose battery is capable of having a one hundred percent recharge within 4-6 hours.

The design in this dual-purpose battery protects it from high vibrations and high impact shocks. It tolerates extreme conditions, operating in temperatures from minus 40 to 80 Celsius degree. During tough temperatures you might encounter in your way, this dual purpose battery will not leave you hanging.

It has AGM technology features that eliminate the need for extremely secure storage measures. There is no risk of an acid spill. The terminals in this dual-purpose battery have brass materials capable of preventing corrosion. It also has seals on its terminals to avoid expelling harmful gases. Its plates use pure virgin sealed lead acid , which allows the battery to have an extremely good performance in its recycling.

Once the dual purpose battery goes through its service life span and loses its functionality, you can easily dispose of it by taking it to a recycling center. Odyssey batteries have a goal to deliver more power and 40 percent more reserve capacity than other batteries, and they succeeded at providing a satisfactory dual-purpose battery.


  • 1150 CCA rating (cold cranking amp) quality
  • Reaches 100% battery charge in low time
  • 80% self-discharge rate depth
  • perfect reserve capacity


  • New battery models have a different types design. If you’re looking to replace an old model, make sure to check if it’s compatible

2. Optima Batteries 8040-218 D35 YellowTop Dual Purpose Battery

81Ly23p6nDL. AC SL1500

Let us advance with optima boat battery review. This battery model from Optima battery has 12 Vol and 620 Cold Cranking Amps. It has a strong starting power that makes it ideal for marine motors and car engines where  in temperatures colder than 0°F or crank an engine for longer than 30 seconds. However, it also works in other vehicles such as recreational vehicles.

Nonetheless, if you have a boat and need an impressive starting power and good resistance casing, this is a good option for you. Like other optima batteries, this model uses AGM batteries technology, making it one hundred percent maintenance free and requires no work between uses.

It is a great battery for many circumstances. The battery can withstand any weather and tolerate really tough conditions you could eventually encounter when you are out there.

It can resist up to 15 times more vibrations than the batteries from other brands and types. The battery’s weight is another plus. Weighing less than 40 pounds, it makes an ideal car battery to mount anywhere in your boat or to carry in case you find it necessary. Altogether, its weight and size make it an easy battery to keep in small storages which is ideal for boats with small spaces.

Another highlight from this battery is the recharging time. It is capable of recharging in six to twelve hours maximum and holds its charge very well. Overall, when it comes to its charge and recharging process, this battery is a reliable efficiency power source.

In general, the Optima Batteries 8040-218 D35 deep cycle marine Battery is a powerful and effective deep cycling battery that works in a starting job too. It delivers outstanding performance and high strength in its power, making it a great choice to consider once you decide to buy a new deep cycle marine battery.


  • Lightweight and easy to install
  • Does not take too much storage space
  • Powerful and effective cycling battery
  • Can be used as a starting batteries


  • Other brands offer higher durability

3. Vmaxtanks 125 AGM Deep Cycle Marine Battery

Vmaxtanks Vmaxslr125 AGM Deep Cycle

Vmaxtanks is a 12 volt AGM good deep cycle marine battery. Its design has 99 percent of recombination capabilities, providing the customer that does not generate dangerous fumes or gases that could threaten neither the boat’s integrity nor the person’s life. It has military-grade custom pure lead acid plates in its construction, which makes this product highly resistant to temperature and heavy conditions.

The rest of the boat’s unities work efficiently with this dual purpose marine battery, and it doesn’t have compatibility issues with most boats. It has a bulky construction that weighs around 74lbs, making it one of the heaviest dual purpose marine batteries currently in the market. However, the battery’s functionality and performance truly compensates for its weight.

The battery’s design focuses on delivering a strong endurance product that does not wear down quickly. Talking of lifespan in this deep cycle marine battery, the model reaches up to 10 years. It allows the customer to have a longest lasting marine battery product with great efficiency for a long period of time without having to worry about the marine starting battery functionality.

While using this, the vehicles receive cold cranking AMPs that could reach 125Ah, a goal that not many dual purpose marine batteries out there can meet regardless of their type and model.

It is capable of providing energy to electronic systems like boats, house devices, small and big vehicles with consistent power for over 8 hours due to its refined reserve capacity (a general indicator of how long a fully charged battery can able to operate essential components if the vehicle’s alternator fails.

It identifies how many minutes the battery can deliver a constant current of 25 amp hours at 80°F without falling below the minimum voltage, 1.75 volts per cell, needed to keep your vehicle running). The best group 31 deep cycle battery for boat or kayak is a good provider of energy to most systems that often don’t get enough energy from regular marine batteries.


  • Reliable and long-lasting qualities
  • Outstanding 125Ah at a 12v power
  • Capable of recharging faster than others
  • cold cranking rating
  • Intelligent reserve capacity
  • Achieves cranking amps rating


  • It could often make the marine starting  & deep battery an uncomfortable piece to move around and replace

4. Optima Batteries 8006-006-FFP 34M BlueTop Starting - Best Of the Best Marine Battery

best deep cycle marine battery

Being top in the list of acid batteries, This bluetop marine starting model from optima batteries has an optimal multi-purposes feature capable of powering up with 12v. It reaches 800 CCA  to 1000 CCA rating (cold cranking amps) in many situations. This version from optima batteries also has thick plastic casing additions, capable of enduring bad weather or conditions.

The thick plastic protects the dual purpose marine battery, keeping the vehicle up and running with efficiency and its occupants safe and secured. This cold cranking amps offers fifteen times more resistance to vibration, allowing the maritime battery to last longer than other models while keeping its integrity at a high performance.

Optima batteries are aware that a constant vibration and jarring from waves could become a threat for any navigating boat and traditional deep cycle batteries, and battery optima have designed a product capable high amounts of vibration resistant, often more than other brands in the market. feature is that this model is lightweight, reaching approximately 39 pounds.

It is because of its light weight that the person can transport it very easily and battery optima have the option to replace it anywhere. Its design uses AGM technology (absorbent glass mat). The dual purpose marine battery requires barely any maintenance procedures at all. To recharge, it takes up to 12 hours and is capable of reserve capacity its energy for a long time.

The Optima deep cycle Batteries 8006-006 34M also works in highly demanding vehicles like sports boats, golf carts etc. This is possible because of the many features available in these models, like its SpiralCell Technology highlight, achieving cold cranking amps cca rating. The cold cranking amps cca rating ensures the industry standard of reliability.


  • Can last longer than other dual purpose marine batteries
  • SpiralCell Technology performance
  • Efficient and durable
  • A reliable product
  • Longer reserve capacity
  • cold cranking amps rating


  • The deep cycle life battery’s continuous trolling time is lower than other brands

5. Mighty Max ML35-12 Light Trolling Motor Marine Battery

Light Trolling Motor Battery Sevylor Minn Kota

The Mighty Max ML35-12 Light Trolling Motor Battery type is a 12Volt dual purpose marine battery pure lead plates by acid (SLA) with a 35Ah capacity. It is a battery type that targets small boats with light-trolling capacities. This product has a faster application when you need to replace your old and worn down marine battery.

It provides the customer with the right tools to make reparations and get their best boat battery up and running quickly. Ideally, this model of agm deep cycle marine starting battery is an ideal replacement to your old one. As a customer, you won’t have to worry too much about whether it is compatible with your vehicle or not since it has many applications and it is very easy to install.

One big highlight from this marine battery type is that it works for starting and deep cycle life equally, offering many options for the customer when it comes to the uses they might need in the long run. design is spill-proof to keep the battery functioning without any possible risks.

Also, the customer won’t need high technical knowledge to get great results from this marine battery. It does not require much experience to install, and it does not need a heavy maintenance process.

The battery’s size is another important feature that the customer will quickly notice. Its dimensions are 7.68 inches x 5.16 inches x 7.13 inches, undoubtedly making it one of the most convenient marine batteries to buy because it won’t be a burden to carry around or to install when you need it.

But do not let the size fool you. The Mighty Max ML35-12 Light Trolling Motor Battery sits on top of the competition being a highly efficient marine starting battery. It is capable of maintaining its integrity over time and also offers reliability.


  • Longer durability
  • Its size makes it comfortable to carry
  • Highly recommended for small vehicles
  • Affordable sealed lead acid battery
  • Perfect battery for your boat 
  • Achieves mca rating 


  • Might have efficiency issues with larger boats
  • Moderate reserve capacity

6. Optima Batteries 8016-103 D34M BlueTop Starting Marine Battery

Optima Batteries 8016-103 D34M BlueTop

Image credit Amazon com

Optima batteries 8016-103 d34m BlueTop Marine starting and deep cycle battery series offers the customers a great addition to their boats. Not only because of its excellent charging features and recharging methods, but also because of optima batteries 8016-103 d34m 's reliability and overall performance.

But, that does not mean it is only exceptionally the best boat battery. The BlueTop starting and deep series also produces marine batteries capable of working in electronic systems, trolling motor, as RV battery, and basically any other machine with 12 Volt capacities.

Buying this Deep cycle starting battery will give you a guarantee efficiency product. The 8016-103 d34m is among the top and most reliable starting and deep cycle batteries in the market, with little to none competition at all.

As mentioned above, this 8016-103 d34m marine starting battery works at 12 Volt with 750 Cold Cranking AMPs. This marine battery is capable of providing energy to boat engines as well as RV motors. The energy it produces can create a first-touch ignition strong enough to get the engine going. It also has resistance to tough weather conditions.

If you decide to go with this 8016-103 d34m marine battery, you can rely on it to keep your machine running regardless of the temperature in the environment. The Optima batteries  BlueTop starting and deep D34M starter Battery is easy to mount basically anywhere without having any concern about its functionality or structure’s integrity.

Because of its weight (43.5 pounds) and rather a small size, you could have this bluetop marine starting battery as a replacement battery for  your boat without any complication. It has 120 minutes of reserve capacity that maintains a constant and good performance in the vehicle.

Because of its exceptional strength and power charging qualities, the starter battery turns on almost every engine in a wide variety of vehicles and systems.


  • Works in a wide variety of engines
  • Perfect construction design that offers reliability and is long service lasting
  • SpiralCell Technology
  • Tremendous reserve capacity
  • long 120 minutes reserving power.


  • Other brands have higher durability over time

7. Universal UB121000 Deep Cycle AGM Battery

Universal UB121000-45978 12v 100AH

This model is a 12Volt battery capable of reaching up to 100 Ah. It has SLA/AGM battery (pure lead plates) powering features and it counts with a reliable reputation that precedes it by offering customers an overall high-quality battery.

This battery has features that make it a trusty power source and outstandingly performance. It is capable of starting up the entire electronic systems your vehicle needs by using steady and sustainable functionality.

It has spill-free qualities and batteries require  no maintenance. Once you successfully install it in your vehicle’s structure, you will not have to fear the battery has a malfunction. It is easy to install and quickly enhances the boat’s functionality.

With this battery, you’re going to get a deep-cycling performance worth its value. Its AGM battery design delivers consistency and a steady charge as long as the battery is functional, which is up to five years. It provides a 100Ah battery capacity that improves the recharging of any engine or electronics your vehicle has.

Another one of the highlights from this deep cycle agm battery is the fact that it works in highly demanding engines during tough situations. This battery model is also extremely good when it comes to its charging.

It has durability over time, and can also hold the charge up to six months when it’s not in use. Since it does not require maintenance, you could pick the battery from the garage and install it without any issues. Overall, you can rely on this deep cycle agm battery to meet up every expectation you might have. It is affordable for many budgets and it pays off in the long run by providing resistance and good performance.


  • Premium quality battery model
  • Anti-Spill structure prevents any damaging
  • Provides steady high energy power
  • Retains charger


  • Lifespan & reserve capacity  is shorter in comparison to other brands

8. VMAX857 AGM Marine Cranking Amps

VMAXTANKS VMAX V35-857 12 Volt 35AH AGM Battery

Here is another vmax battery reviews. The most noticeable feature in this deep cycle agm battery is its heavy-duty design. It is capable of better performance and service lifespan in either float or cyclic applications, even after it suffers many depth of discharge rate repeatedly during its use. Like most other, this model is a no maintenance product.

The customer will not have to check the battery state on a daily basis. It also does not require you to add water to the tank or any of those tasks that the old models of battery needed constantly to keep working. It shares similarities with other VMAX products. More specifically, it has the unique physical and chemical structure on its plates. VMAX marine batteries undergo special treatment during the manufacturing date & process.

This process makes the marine batteries gain strength and better performance than other brands. The battery’s design counts with Absorbent Glass Mat (AGM technology) between the plates, adding optimum to the many physical and electrical advantages this model has over wet sealed lead-acid batteries.

It is because of the manufacturing date & process that this battery is capable of resisting high shocks and resistance to shock and vibration. The electrolytes in the battery get absorbed by the AGM batteries (absorbent glass mat), classifying the battery as a non-spillable and a non-hazard product. Tank seals add extra protection to the plates, keeping them packed very tightly and allowing the customer to have a maintenance-free package.

Another important feature to keep in mind from this battery is its durability over time. It is also worth mentioning their capability to recover successfully after repeated depth of discharge rate.

If you decide to go for this model, you can rely on the battery to provide 4 hours of running time in larger engines and 9 hours in smaller trolling motors, reaching from 50 to 60% depth of discharge. It works on 18 to 40 LB trolling motors. Vmax is by far the longest lasting marine battery for trolling motor.


  • Powerful battery & reserve capacity
  • No spill offers a maintenance-free battery
  • No chemical hazard to the boat or the occupants
  • Longevity
  • AGM battery technology (absorbed glass mat)


  • Charging quality is not as efficient as other brands

9. Exide XMC-31 MEGACYCLE AGM-200 Marine Battery

Exide XMC-31 MEGACYCLE AGM-200 Sealed Maintenance Free

Here we have choose a battery with a dual battery terminals design. It reaches 925 CCA rating (Cold Cranking Amps) at 0 degrees °F and 1110 Cold Cranking Amps at 32 degrees °F. A tough weather won’t be any problem for the engine powering if the customer is using this battery.

With this feature alone, customers are certain their trolling motors will have enough power and efficiency under many different types circumstances, making it a strong contestant for the best marine battery for starting and electronics spot.

It has an Absorbent Glass Mat (AGM batteries) separator design that focuses on providing optimal recombination rates. By doing this, the battery prevents cell dry-out and provides superior element compression. These features make sure the battery’s functionality under extreme vibration and high cycling operations. 

Like other deep cycle maritime batteries, the Exide XMC-31 has a reserve capacity capable of holding over 200 minutes. Exide Technologies is a company that understands the best marine cranking battery for bass boat navigating experience as an activity without any concerns in mind.

So, they offer to choose a battery capable of providing cycling qualities two times better than other brand's batteries. battery also offers a resistance to vibration over 12 times more than other batteries, and 40 percent greater charge acceptance over conventional 31 series flooded batteries.

This battery can work as a hybrid, making it an available option for starting. It works in many sorts of vehicles, from boats to RVs. However, if the customer decides to buy this battery model, they will need a serious and capable 3 battery bank onboard marine battery charger to fulfill its reserve capacity to get the best agm marine battery out of the Exide battery.

In case the customer needs more than one battery, it’s recommended to buy the batteries with the same manufacturing dates to avoid possible issues with its compatibility. Also Cold cranking amps is a good indicator while choosing AGM Battery (absorbent glass mat battery).


  • Highly resistance to cold
  • AGM battery (absorbed glass mat) features
  • Utmost reserve capacity


  • Other brands have better charge holding features

10. Optima Batteries 8020-164 35 Redtop Starting Battery

Optima Batteries 8020-164 35 RedTop Starting Battery

This OPT8020-164 battery model from Optima batteries is a 12 Volt battery. It is an outstanding battery capable of generating a best marine cranking amps burst of ignition power while retaining enough energy to starting power up the rest of the marine accessories. It is a battery with a multi-purpose feature that makes it an ideal for many scenarios you could be involved in.

The battery works in many types of machines, and not many other batteries can provide the performance this one offers. This battery excels at powering up boats and keeping you afloat if you happen to navigate through bad weather or a sea with heavy tides. It has fifteen times more resistance to vibrations than what other batteries offer.

The OPT8020-164 35 Redtop Starting Battery will prove its worth by keeping the systems in full capacities for a better navigating experience. Another instance this battery outperforms is in a cold weather. It has 720 Cold Cranking Amps, allowing the battery to work efficiently and keep the vehicle running during cold temperatures.

The spill proof feature is also present in this battery, taking care of frequent concern about keeping the battery in the right position to avoid any damage or malfunctions.

Once you need to recharge it, you will notice it is an easy task to do and does not require much effort. It weighs about 32 pounds, which makes it a light deep cycle battery to move around and install back again in the vehicle if necessary. Another highlight worth mentioning is the battery’s Spiral-Cell Technology that is a frequent characteristic in Optima marine batteries.


  • Has multiple applications
  • Allows compatibility with many systems
  • High vibration resistant
  • Recharging process is faster than other brands
  • Maintenance free


  • Other deep cycle battery models have better durability
  • Reserve capacity is somewhat low.

11. VMAX MR127 12 Volt 100Ah AGM Battery

 VMAX MR127 12 Volt 100Ah AGM Deep Cycle Maintenance Free Battery for boats

The VMAX MR127 is a 12 Volt battery. It is a heavy-duty deep cycle battery with AGM technology features (absorbent glass mat). This deep cycle agm battery model includes an electrolyte suspension system of high porosity that is capable of absorbing and containing the electrolytes. During the time the battery is functioning, it does not produce contaminating elements that could harm the battery's lifespan or damage the boat's structure.

This deep cycle agm battery has sealed lead-tin alloys capable of providing an extra margin of performance during the battery’s lifespan. Allowing the battery to have full efficiency throughout its use time and provides the boat or other vehicles with enough energy to starting power up its systems.

More so, this types of marine battery is capable of fitting any Group 27 Agm Deep Cycle Battery Box . It can adjust properly in units like the MinnKota Trolling Motor starting Power Center. Following the brand’s unique agm design, the battery also has great quality in the physical and chemical structure of their plates. This feature allows the battery to endure high vibrations and shocks.

Another great feature from this battery model is the compatibility with many structures. As long as they have a 12 volt DC system, the battery will most certainly improve the overall performance of the vehicle and its accessories. A example of this battery’s efficiency is the amount of time it can successfully power up an engine.

The MR127 can continuously run heavyweight thrust motors for 12 hours at the lowest speed, 7.1 hours at medium speed, and 2.4 hours at a higher speed. If your vehicle requires more battery capacity than this, you can always double up the powering by connecting several models together in a 12V parallel connection. Last but not least, this is a maintenance-free battery capable of preventing any spills for more durability.


  • Heavy-duty battery construction
  • Compatible with the MinnKota Trolling Motor Power Center
  • No spill, no silica gels, no contamination
  • Awesome reserve capacity


  • Heavy weight battery

12. VMAXTANKS MR107-85 12V Marine Cranking Amps

VMAXTANKS MR107-85 12V 85AH Marine

If you’re looking for battery with longer service life span, this might be your best marine batteries bet. This battery is capable of functioning for over 8 years. It provides durability most regular batteries don't have. It also offers an Electrolyte Suspension System most VMAX models have.

This system has AGM battery qualities with a high porosity that absorbs and contains the electrolytes to prevent any damage. Furthermore, this in not a gel battery that uses any silica gel or any other contaminants. This is a Heavy-Duty battery model, with weight above 50 pounds. For this reason, it is not an easy battery to move around quickly.

However, it totally compensates with functionality and efficiency. It can push maritime vehicles the whole day and still have power left after you have finished your activities. It often takes a lot of use to get it under ½ capacities. These batteries have a quick recovering even after they go through many discharges. For this reason, this is also another great product to consider when you are looking for a new battery.

To get it running at its best 12 volt marine battery capacity, you will have to use chargers with special compatibility for this battery. For example, you will enhance the battery’s overall performance by using a VMAX 1207 charger instead of a regular 2 stage charger.

Once it has a full charge according to it's reserve capacity, it can provide energy to several types of engines. It not only works great in vehicles, but it can also work to power up your house devices, alarm systems, to charge other devices among other things. After all, a multi-purpose battery often pays its value by being efficient in the many options it can offer.


  • Electrolyte Suspension System
  • Multiple batteries applications on many structures
  • AGM Marine cranking battery amps qualities
  • Can hold its charge efficiently
  • Strong reserve capacity.


  • Weight is over 50 pounds
  • To get the best out of this agm marine battery, you need a certain type of charger

What Makes A Good Marine Battery?

There are many benefits of buying a deep cycle batteries. As we have mentioned above, it is great for discharging energy at small amounts during longer periods, a highlight that other batteries do not accomplish, but it has plenty of other important characteristics, like the following.

Optimum Performance

Many systems can take advantage of batteries with deep cycling qualities. For example, this type of battery is ideal for trolling. In case the buyer has bigger and more demanding trolling motors, there’s always the option to connect several batteries, creating a high and reliable power source. A good one can serve as a source of power as well. If the boat runs out of power, this is able to provide steady energy for the instruments and navigational devices. Of course, the battery’s efficiency will depend on how much energy the system needs

.A greater current means the battery discharges faster than others. To avoid this, the buyer has to completely know the boat’s details, and how much energy the trolling motor demands. It’s because of these reasons that customers should always look out for the best marine deep cycle battery for trolling motor. Cold cranking amps rating qualified optimum performance in terms of power delivering.


Another benefit is that it has plenty of uses, not only for maritime needs or high power demanding engines. This type of battery works in many small vehicles as well as other systems like house devices, powering up security alarms, recharging other electrical devices, etc. The battery’s durability will depend on how you use it. For instance, it can last from three months to a whole year if you use it for starting. However, for deep cycling, the service life span increases from 1 to 8 years. For mix use as starting and deep cycle, it could last up to 3-4 years.

Reserve Capacity

Deep cycle battery often has two or three times the reserve capacity a regular battery reserve capacity has. It can withstand countless discharge cycles in what people call “deep discharge”. Regular battery’s design only allows it to discharge a small amount of energy at a time. The reserve capacity is a huge plus in these batteries as it allows the battery to hold its charge for a longer period of time. All these reasons make the it a great option when it comes to functionality and overall performance.

How To Take Care  A Marine Battery?

Deep cycle batteries are one of the most important parts of any off-grid system, other grid applications and because of that, anyone who owns one of these batteries require to know the importance of doing proper maintenance.Naturally, we have to understand which type of deep cycle battery we own. There are two types that are the most common: flooded battery, lithium batteries and sealed batteries.

Flooded Batteries

Flooded batteries have high amounts of acid and require you add water manually, as well as a proper ventilation environment. Distilled water is the best marine battery option to use when it comes to flooded batteries.It is same for wet cell battery

However, it’s better not to add too much water in the battery to avoid overfilling it. It is also important to remember that you need to add the water only after charging the battery. Otherwise, the water level will increase dramatically and can cause an overflow of water and acid in the battery, damaging its integrity and durability.Other than that, most flooded and sealed batteries share many maintenance similarities.

How To Maintain A Deep Cycle Battery

Another important thing to do to maintain your battery, regardless of its type, is to inspect it periodically and clean it if it is necessary. Most batteries have high protection standards, so you definitely don't have to worry about the battery's interiors. It only requires you to check the outside for any dust, dirt or moisture.The most important thing to remember is that you are going to need a higher amount of voltages if the battery is charging at a cold temperature. If you are charging in under higher temperatures, you should use lower voltages.


Storage is also an important aspect to keep in mind for maintaining both types of batteries. You should always try to store the battery in a cold space with no moisture, and away from external factors, like temperature, that could damage the battery’s integrity.Temperatures above 35C will damage it, decreasing its load capacity and reducing its lifespan.

On the other hand, lower temperatures, reaching under 10C, can also damage it. While lower temperatures do not necessarily decrease its service life span, it does deal big damage to the battery’s productivity.In general, most batteries don’t usually require high levels of maintenance, but it does not take much time to check on them from time to time. After all, the only result that could come out of maintaining our batteries is a longer lifespan and better efficiency.

Frequently Asked Questions

What’s a deep cycle maritime battery?

A deep cycle maritime battery is a battery capable of having constant discharges using most of its capacity. These batteries offer a steady amount of current for a longer time.

Does the Deep Cycle Battery Work as a Starting Battery?

In most cases, deep cycle batteries can work as starting batteries as well. As a general rule, if you are going to use a deep cycle battery for starting and deep purposes, you will need an oversized battery about 20% in comparison to your current starting battery.

What effects does the temperature have in the battery?

If it goes through a low temperature, its capacity reduces. On the other hand, the battery increases its capacity when the temperature goes up. This is why vehicles usually won’t start up on a cold winter.

What is the Right Type for my boat?

Most deep cycle batteries will work on a boat. However, each brand offers unique characteristics like materials, deep cycling or starting capacity ,size or weight that could work better depending on the type of boat you have.

Does the battery require high maintenance?

You should check on it periodically to confirm its state. Factors like temperature, moisture or dirt around it could damage the battery’s integrity.

How long do dual purpose marine batteries last?

THe Typical lifeline battery is 1-6 years, it depends on periodical maintenance,quality of the plates i mean whether it is thicker plates or not & the frequency of use.Typically lithium marine batteries last long.

Is there a difference between deep cycle and marine battery?

Yes, there are differences in construction,lifespan,ease of use, battery life etc.

What type of battery is everstart marine?

Everstart marine is a group 24 lead acid automotive battery.

Which deep cycle marine battery best fits your 12v power requirement?

What is meant by VRLA battery?

Valve Regulated Sealed Lead Acid Batteries

who makes the best Brand?

Optima,Vmaxtanks,Odessy,Exide are well know & reliable brands.

Are exide marine batteries good?

Yes Of course, Exide manufactures industrial grade batteries. 

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

Our top Choice
9.5/10 Our Score
  • Mountable in virtually any position 
  • Vibration resistant for durability. 
  • SpiralCell Technology

Final Words

There are plenty of battery options to pick from in the market. Choosing the best marine batteries for the money are a difficult task, but after you know each battery’s features, you will have a better understanding of their capacities and how they work.Be make sure to pick the right one and see you on the sea!

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Last Updated on September 19, 2021 by GuestAdmin

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