The Best Dual Purpose Marine Battery Reviews

Last Updated on June 21, 2021 by Donnell Henderson

Boaters need marine batteries for either cranking up their engines and powering the other devices on the boat. Instead of getting a separate deep cycle and cranking batteries, many boaters prefer getting a dual purpose marine battery. A dual-purpose battery is powerful enough to crank the engine and act as a power source for all the electronics on your boat for an entire day.

Dual-purpose batteries come with thick plates inside them, so they have more antimony than other cranking batteries. And unlike starting batteries, this option can tolerate deeper discharges. Therefore, they can be used for an extended period without worrying about them getting damaged.

But, choosing the right one can be quite challenging, especially with the numerous options available. We have created this review of the best dual-purpose marine batteries to help you narrow your search.

So, let’s dive right in…

 

My Top Pick

My favorite is the Odyssey 31M-PC2150ST-M because of its high CCA. I love it because it’s maintenance-free and vibration-resistant.

 

Here Are My Dual-Purpose Marine Battery Reviews

  1. Odyssey 31M-PC2150ST-M — The Best Dual-Purpose Marine Battery
  2. Optima Batteries 8012-021 D34 Marine Batteries
  3. Trojan 27-AGM Dual Purpose Battery
  4. Banshee BCI Group 34M Dual-Purpose Battery
  5. Banshee 27M Dual-Purpose Marine Battery
  6. Optima Batteries 8042-218 D75/25 Dual-Purpose Battery
  7. Optima 8037-127 Dual-Purpose Battery

 

1. Odyssey 31M-PC2150ST-M — The Best Dual-Purpose Marine Battery

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

Odyssey has produced some of the best power sources available, and Odyssey 31M-PC2150ST-M is no exception. Odyssey 31M-PC2150ST-M features a spill-proof design and increased resistance to shock and vibrations. Besides being one of the most affordable group 31 power sources, Odyssey 31M-PC2150ST-M is also the heaviest. And many boaters who have purchased this unit have reported that it’s the best in its class and worth every dollar.

As a cranking battery, it provides a CCA of about 1150 Amperes, and as a deep cycle unit, it features 205 minutes of reserve capacity rating. Therefore, it has more than enough power to start your engine and still support all your electronics and devices. It can sustain a high stable voltage discharging for an extended period at 400 cycles at 80%. And compared to other conventional deep cycle units, Odyssey 31M-PC2150ST-M has a 70% longer cycle life.

Odyssey 31M-PC2150ST-M has one of the highest recharge efficiency of all the sealed lead power sources available. Odyssey 31M-PC2150ST-M is capable of attaining 100% recharge within less than 6 hours. Its vibration-resistance-design protects it against mechanical vibration and high impact shock. And the good thing about this power source is that it can function adequately between 40°C and 80°C. But, some boaters have complained that it’s quite heavy.

 

Specs 

  • Brand: Odyssey
  • Weight: 77.8 pounds
  • Cold Cranking Amperes: 1150 Amperes
  • Battery Cell Type: AGM, Lead Acid

 

Pros 

  • Durable
  • High-quality construction
  • Its charge can last for a very long time
  • It takes less than 6 hours to recharge fully
  • It is easy to install
  • Affordable

 

Cons

  • Some users have complained that It’s bulky and heavy

 

Overall Rating: 4.6 out of 5

Conclusion: Odyssey 31M-PC2150ST-M is a significant investment, and many users pledge that it’s worth it. It is ideal for boaters looking for long-lasting power for their additional electronics and devices.

CHECK CURRENT PRICE

2. Optima Batteries 8012-021 D34 Marine Batteries

Optima 8012-021 D34 is an exceptional unit designed to retain charge for a longer time than most batteries in the market. And if you are a fan of Optima, you will love this unit’s low maintenance design, high cranking voltage, and durability.

With a CCA of about 750 Amperes, this unit will keep your engine running for an extended period. As long as you need a power source that can provide you with the basic needs, you will be ok with Optima 8012-021 D34. Optima 8012-021 D34 is highly recommended for vehicles, so make sure it fits perfectly on your boat.

This power source is 15 times more resistant to shock and vibrations than most marine batteries for durability.

Optima 8012-021 D34 can come in handy the electrical load on your boat are higher than normal. It can also be quite useful when the discharge cycle is more than your standard engine, starting like in a boat with many electronic accessories. However, it tends to overheat when overcharged for an extended period.

 

Specs

  • Brand: Optima
  • Weight: 42.9 pounds
  • Cold Cranking Amperes: 750 Amperes
  • Voltage: 12 volts

 

Pros

  • It is easy to maintain
  • It has a high cranking power
  • Its vibration and shock-resistant
  • It can power your devices for an extended period

 

Cons

  • It tends to overheat when overcharged for an extended period

 

Overall Rating: 4.4 out of 5

Conclusion: Optima 8012-021 D34 is an excellent unit with a high vibration resistance level.

CHECK CURRENT PRICE

3. Trojan 27-AGM Dual Purpose Battery

Trojan power sources are known for their sustained performance over an extended period, and Trojan 27-AGM is no exception. Trojan has a very long history of manufacturing high-quality products. Trojan 27-AGM is a unique flooded power source with the least cost-per-hour of any power source and the longest life.

But to enjoy these benefits, you have to be ready to keep up with its regular maintenance. You have to keep the terminals and top clean, equalize charges and watering.

Experienced anglers know that a bad battery can mess up a great fishing day. Therefore, you can trust this unit to deliver more hours of fishing. This power source uses a high-density paste formula that makes Trojan batteries standout. This paste makes it possible for Trojan batteries to outperform some competitors.

The Trojan grid technology that comes with this unit lowers the risk of deterioration and corrosion of parts. Plus, its AGM design offers a longer run-time than its competitors. However, it’s not maintenance-free.

 

Specs

  • Brand: Trojan
  • Weight: 64.0 lbs.
  • Cold Cranking Amperes: 550 amperes
  • Reserve: 158 minutes
  • Capacity: 89-ampere hours

 

Pros

  • It provides longer run time
  • Durable
  • It is easy to use
  • The Trojans grid technology helps reduce the risk of deterioration and corrosion of parts

 

Cons

  • It’s quite heavy
  • It’s not maintenance-free

 

Conclusion: thanks to the High-density paste formula, Trojan 27-AGM can outperform competitors.

CHECK CURRENT PRICE

4. Banshee BCI Group 34M Dual-Purpose Battery

All Banshee power sources are designed to withstand long, slow recharges, and deep charges and this dual-purpose unit is no exception. Banshee 34M is a great unit that provides long-lasting performance. Banshee manufactures its products using the most up to date materials in the market. And Banshee 34M is a resilient, powerful, and rugged unit that you can rely on for lighting, igniting, and cranking.

Thanks to its unique design, Banshee 34M is a perfect design for repeated deep-discharge. This power source offers 30% more cyclic life than most standby units. Banshee 34M is ideal for wind and solar renewable energy storage, marine applications, and RVs.

Banshee 34M is a completely sealed unit that can be easily mounted in a wide range of positions. Therefore, you will never have to worry about leaking. This power source is leak-proof and spill-proof. This battery has porous microfiber separators that can trap and absorb electrolytes. It has some electrolytes suspended in a fiberglass mat that serves as an absorbent sponge. But it can be a tad bulky for some users.

 

Specs

  • Brand: Banshee
  • Cold Cranking Ampere: 500 amperes
  • Weight: 47.4 lbs.
  • Ampere Hours: 75 hours

 

Pros

  • It is completely sealed
  • Easy to handle and install
  • Maintenance-free
  • It has dual post terminals
  • It is spill-proof

 

Cons

  • It can be a tad bulky for some users

 

Overall Rating: 5.0 out of 5

Conclusion: Banshee 34M provides a perfect balance between deep cycle performance and cranking.

CHECK CURRENT PRICE

5. Banshee 27M Dual-Purpose Marine Battery

Banshee 27M is a maintenance-free marine battery that can provide more than enough power. Banshee 27M utilizes the AGM technology that is ideal for boats and personal watercraft. This completely sealed unit can be mounted onto your vessel in any position. Banshee 27M’s unique construction guarantees that no electrolyte leaks at its terminals.

Banshee batteries use the Absorptive glass mat system to guarantee that more electrolytes will be absorbed. Therefore, it can provide continuous service and the longest life. This unit has a unique design that controls the generation of gases when being used. Banshee 27M is both shock and vibration resistant.

Banshee 27M can withstand deep cycling and high current output for sustained performance. During this battery’s expected floating service life, there is no need to add water or confirm the gravity of electrolytes. However, Banshee 27M can be a bit heavy for some users.

 

Specs

  • Brand: Banshee
  • Voltage: 12 volts
  • Cold Cranking Amperes: 600 amperes
  • Weight: 59.5 lbs.

 

Pros

  • Maintenance-free
  • It is relatively easy to handle
  • Completely sealed
  • Durable
  • Shock and vibration resistant

 

Cons

  • It can be a tad heavy for some boaters

 

Conclusion: Banshee 27M is an environmentally friendly unit that doesn’t release too much gas when being used. And that is because of its unique design that allows for recombination of more than 90% of the generated gas.

CHECK CURRENT PRICE

6. Optima Batteries 8042-218 D75/25 Dual-Purpose Battery

With unparalleled cycling capability and premium cranking power, this battery can power a wide range of vehicles and boats. This unit features a Spiralcell design that provides a clean and strong power source. And thanks to its low self-discharging rate, this unit is perfect for seasonal use. Therefore, you can store your battery all winter without worrying about it getting damaged or having to recharge it.

Thanks to its unique AGM design, the Optima 8042-218 D75/25 can provide even optimal cranking power in bad weather. This power source is 15 times more resistant to shock and vibrations. Therefore, you will never have to worry about the harsh weather conditions damaging your battery. And for constant performance, it comes with a 98 minutes reserve capacity. However, it cannot be sold on Catalina Island.

 

Specs

  • Brand: Optima
  • Weight: 37.8 pounds
  • Voltage: 12 volts

 

Pros

  • It is 15 times more shock and vibration resistant than most marine batteries
  • Maintenance-free
  • It can be mounted in any position
  • Faster recharging

 

Cons

  • It cannot be sold on Catalina Island

 

Overall Rating: 4.2 out of 5

Conclusion: Optima 8042-218 D75/25 is a reliable unit that can power a vessel for an extended period. Thanks to its low discharging rate, this unit is perfect for seasonal usage.

CHECK CURRENT PRICE

7. Optima 8037-127 Dual-Purpose Battery

Optima 8037-127 battery is a reliable cranking and deep cycle option with two times longer life than most batteries. This unit has thrice the cycling capability with maximum cranking power for any vehicle. Thanks to its 830 cold cranking amperes and 1025 cranking ampere, this unit can outperform most traditional batteries. And because it’s AGM, Optima 8037-127 is spill-proof. You can install it however which way and it’ll do great.

This maintenance-free power source is shock and vibration resistant. Plus, it comes with a 3-year free replacement warranty. Its lower internal resistance offers faster recharges and more efficient power output. This dual-purpose unit can power a wide range of vehicles and boats. However, it can be a tad heavy for some users.

 

Specs

  • Brand: Optima
  • Weight: 54 pounds
  • Voltage: 12 volts

 

Pros

  • Durable
  • Maintenance-free
  • It is spillage free
  • Shock and vibration resistant
  • Faster recharging

 

Cons

  • It can be a tad heavy for some users

 

Overall Rating: 4.3 out of 5

Conclusion: Optima 8037-127 battery is a powerful unit that can power a wide range of automobiles. And thanks to its unique AGM design, Optima 8037-127 is shock and vibration resistant.

CHECK CURRENT PRICE

best dual purpose marine battery

 

How to Choose a Dual Purpose Marine Battery

A dual-purpose marine unit can perform the work of both cranking and deep cycle batteries. This type of battery can be quite useful in a fishing vessel that has electronics and devices onboard.

And powering these electronics and devices using a cranking battery is not a good idea. Plus, a deep cycle battery cannot crank up most engines. Purchasing a dual purpose is just a great idea.

But with the numerous options available, selecting the best dual-purpose battery can be quite challenging. And that is because there are multiple factors you have to consider when choosing the best option for you. Remember, a reliable dual-purpose battery should be powerful enough to serve as the power source for cranking and electronics.

 

Marine Battery Group Size

Make sure you pay attention to the weight and size of a dual-purpose battery.

Check the group size and ensure that it fits in your vessel’s battery compartment. Some prefer a lighter battery that can power their vessel, while others don’t mind a battery weighing over 75 pounds.

 

The Design

Most dual-purpose power sources feature a sealed AGM style, simply because the Lead Acid batteries cannot power huge boats. AGM design style and the materials used to make a battery can make it maintenance free.

An AGM design also guarantees you that you will never have to worry about spillage.

 

Cold-Cranking Amperes

The cold-cranking amperes of your battery will be determined by your engine’s size. After all, power sources with low CCA cannot crank some engines, especially after they have been used throughout the day. So make sure the CCA of your battery equals or is more than what your engine needs.

 

Reserve Capacity

Reserve capacity refers to the current used to power all the accessories and electronics on your boat. Reserve capacity is the number of minutes your battery can run before being drawn beyond the minimum voltage.

 

Conclusion

Even though dual-purpose batteries are more expensive than cranking and deep cycle batteries, they are worth it. A dual-purpose unit can be an excellent option for people with small vessels or if your boat doesn’t have enough space for two batteries. Instead of getting two batteries or power your devices using the starting battery, why don’t you get a dual-purpose battery?

But choosing the right option is more than just walking into a store picking the first battery you get. There are several features you have to look out for when buying a dual purpose battery. So we have prepared the above dual purpose marine battery reviews to help you get the right option for you.

From our research, we have concluded that the Odyssey 31M-PC2150ST-M is the best option available. And that is because it has a high CCA and reserve capacity. This unit can sustain high stable discharges for an extended period.

Scroll to Top