Top 10 Best Deep Cycle Marine Batteries in 2020

For starting a boat engine, appliances on board, or a trolling motor, it helps to have the best deep cycle marine battery. So if you own a water vessel or boat, look at the deep cycle marine batteries reviewed here. Furthermore, you can find a buyer’s guide to help you choose which one to buy. As you know, there are many different types available, and some of them are starter batteries, while others offer you dual function.


Best Deep Cycle Marine Batteries in 2020


1. Optima YellowTop Marine Battery

Optima YellowTop Marine Battery

[amazon box=”B000MSBUA4″]

For one of the best dual-purpose marine batteries, the YellowTop 8040-218 D35 can help. The compact size and low weight offers you versatility for starting and deep cycle power.

The capacity is 48Ah, while the reserve capacity is 98-minutes. Furthermore, the cold cranking amps is 620A. Therefore, you get excellent cranking power with outstanding cycling abilities.

On the other hand, it has a spill-proof design with the AGM technology making it maintenance free as well. Moreover, you can mount the battery in any position.

The deep cycle marine battery works best when you need to power multiple accessories at the same time. For mid-sized outboard motors with electrical equipment on-board, the battery will provide a steady cycle of power to keep things working.

Features
  • Has a three-year warranty
  • Made with Absorbent Glass Mat and the Lead-Acid is Sealed
  • Weighs 36.4 LBS with a size of 9.4 (L) x 6.8 (W) x 7.7-inches (H)
  • The capacity is 48Ah with a CCA of 620A
  • The current and voltage is 10A, 13.8-15V
  • Has an expected lifespan of 300+ discharges and recharge cycles

  Get it now on Amazon.com


2. Universal Power Group UB12350 – Deep Cycle Marine Batteries

Universal Power Group UB12350

[amazon box=”B001VV0318″]

The deep cycle marine battery works with absorbent glass mat technology and comes at an affordable price. The capacity is 35Ah, but you can also buy it with a 75Ah capacity.

You find the acid electrolyte in the fiberglass mat and sealed with valve-regulated ABS casing. The battery is spill-proof and maintenance-free plus resistant to vibration.

Therefore, you can use it at any position and get more than 1,200 cycles with a discharge of 30%. Moreover, you can get up to 250 cycles at 100% discharge as well.

On the other hand, it comes with a handle for ease of carrying. There is a float mode that should last up to five years, and it works with most charges and charging methods.

Features
  • Comprise of an absorbent glass mat with sealed lead acid
  • The size is 8 (L) x 5.9 (W) x 8-inches (H) and weighs 22.5lbs
  • You can buy it in a 35Ah or 75Ah capacity with a 315 CCA
  • The current and voltage is 10.5A, 14.5-14.9V
  • Furthermore, the lifespan is 1200+ cycles with a depth of discharge of 30%
  • Has a float mode that should last up to 5 years

  Get it now on Amazon.com


3. Odyssey 31-PC2150S

Odyssey 31-PC2150S

[amazon box=”B07GFT31KC”]

For the best deep cycle marine starting battery, the Odyssey is the one to have. You get a total of 1150 CCA with 2150 amps of pulse hot cranking.

Similar to the other brands, the battery works with AGM technology and has a durable construction. The components packed with pure lead plates.

Therefore, the cells can recover quickly after using it for up to 400 cycles of 80% depth of discharge. The lifespan of the battery is up to ten years.

Furthermore, you get a stable voltage and takes up to six-hour to charge. With the sealed design, there are no spills so you can position it in any position.

For gas reabsorption, it has a self-regulating valve and the constructions superior.

Features
  • Comprise of an absorbent glass mat with sealed lead acid
  • The size is 13 (L) x 6.8 (W) x 9.41-inches (H) and weighs 77.8lbs
  • You can buy it in a 100Ah capacity with an 1150 CCA
  • The current and voltage is 50A, 14.1-14.7V
  • Furthermore, the lifespan is up to 12 year with a recovery of up to 400 cycles @ 80% depth of discharge
  • Has a float mode that should last up to 5 years

  Get it now on Amazon.com


4. Odyssey Thunder Marine

Odyssey Thunder Marine

[amazon box=”B0002ILK6I”]

The Odyssey Thunder is one of the best dual-purpose batteries you can buy. Therefore, you get a high capacity with cranking power.

The price tag is a bit high, but worth it! Furthermore, with the AGM engineering, it prevents battery dry-out, offering you superior performance.

You get a high cycling use, and it can handle extreme vibration at the same time. On the other hand, you get 925 amps of cold cranking with a reserve capacity of 200-minutes.

The deep cycle is 100Ah with a high discharge rate making it versatile to use. Moreover, it retains power and recharges quickly.

When used with a trolling motor, you can expect up to 4-hours of powering. What is more, you get a two-year warranty included.

Features
  • Comprise of an absorbent glass mat with sealed lead acid
  • The size is 13 (L) x 6.7 (W) x 9.3-inches (H) and weighs 71lbs
  • You can buy it in a 100Ah capacity with an 1100 CCA
  • The current and voltage is 25A, 14.1-15V
  • Furthermore, the lifespan is up to 10 years in float mode

  Get it now on Amazon.com


5. VMAXTANKS Deep Cycle Marine Battery

VMAXTANKS Deep Cycle Marine Battery

[amazon box=”B008974VFG”]

The deep cycle battery has a 35Ah capacity with high-quality construction. You get a long-lasting model with the AGM technology that is maintenance and spill-free.

Furthermore, the cells tank sealed, making it a reliable battery to use. The fantastic thing is that the battery can recover fully with a regular discharge of 60%.

Used in float mode, you can expect the use of up to 8-years. For ease of transport, it has a handle and lightweight design to use in any position.

Moreover, you can use it to power a 40lb trolling motor for up to 9-hour with a runtime of 60% depth of discharge.

Features
  • Comprise of an absorbent glass mat with sealed lead acid
  • The size is 7.7 (L) x 5 (W) x 6.1-inches (H) and weighs 25lbs
  • You can buy it in a 35Ah capacity with a 300A CCA
  • The current and voltage is 3-14AA, 14.4-14.9V
  • Furthermore, the lifespan is up to 8 years in float mode

  Get it now on Amazon.com


6. Optima BlueTop – Deep Cycle Marine Batteries

Optima BlueTop - Deep Cycle Marine Batteries

[amazon box=”B06XX197GJ”]

Here we have another dual purpose deep cycle marine battery offering you versatility when used. The cells are compressed tight to resist vibration and come with a long lifespan.

You get 800 amps cold cranking power with a capacity of 66 amperes with a reserve of 140-minutes — the battery cells made with two lead plates and coated with lead oxide for long-lasting use.

Furthermore, you can get up to three times more recharges compared to the standard marine battery. On the other hand, you get a spill-proof design that is maintenance-free to mount in any position.

Features
  • Comprise of an absorbent glass mat with sealed lead acid
  • The size is 12.2 (L) x 6.8 (W) x 8.7-inches (H) and weighs 53.8lbs
  • You can buy it in a 66Ah capacity with an 800A CCA
  • The current and voltage is ten amps, 13.8-15 volts
  • Furthermore, the lifespan is up to 300+ discharge with a recharge cycle
  • In float mode, the battery can last up to eight years

  Get it now on Amazon.com


7. Optima BlueTop Starter Battery

Optima BlueTop Starter Battery - Deep Cycle Marine Batteries

[amazon box=”B00075OSCO”]

The 8006-006 34M deep cycle marine battery from Optima is one of the best marine starter batteries. You get a steady cranking with performance, and it is durable.

You can use it in harsh conditions as it delivers up to 800 CCA with a total capacity of 50 amperes and a reserve capacity of 100-minutes.

Furthermore, it has a spill and maintenance-free design to use in any position as well.

Features
  • Comprise of an absorbent glass mat with sealed lead acid
  • The size is 10 (L) x 6.9 (W) x 7.8-inches (H) and weighs 38.4lbs
  • You can buy it in a 55Ah capacity with an 800A CCA
  • The current and voltage is ten amps, 13.8-15 volts
  • Furthermore, the lifespan is up to eight years in float mode

  Get it now on Amazon.com


8. Banshee Deep Cycle Marine Battery

Banshee Deep Cycle Marine Battery

[amazon box=”B07MNXHKVN”]

The Banshee is another dual-purpose battery made for marine use. With the outstanding design, it can withstand grave charges and slow recharges.

Furthermore, the model replaces the Optima D27M and offers you a long-lasting performance. On the other hand, it has a Hydrometer built-in show you the current states of the battery life.

You can use the battery for lighting, cranking, and igniting. Moreover, it has more battery plates to provide a bigger surface offering more power.

The battery can handle 400 charges/discharge cycles up to 80% depth of discharge.

Features
  • Comprise of an absorbent glass mat with sealed lead acid
  • The size is 12.2 (L) x 6.8 (W) x 8.9-inches (H)
  • You can buy it in a 77Ah capacity with an 800A CCA
  • The voltage is 12 amps and has a reserve capacity @ 25 amps is 114
  • Made with flip-up handle and comes with a two-year warranty

  Get it now on Amazon.com


9. Mighty Max Deep Cycle Marine Battery

Mighty Max Deep Cycle Marine Battery - Deep Cycle Marine Batteries

[amazon box=”B07RRYZQPW”]

The ML75-12 Gel deep cycle battery you can mount in any position. Furthermore, the design resists vibration and shocks at the same time.

The GEL is maintenance-free and comprise of no acid and works out of the box. Furthermore, it offers a 12V 75Ah recharge and comes with a built-in voltmeter to check the lifespan of the battery.

Moreover, it does not include mounting hardware or a wire harness

Features
  • Comprise of an absorbent glass mat with sealed lead acid
  • The size is 10.24 (L) x 6.61 (W) x 8.27-inches (H)
  • You can buy it in a 75Ah capacity
  • Weighs 51.25lbs
  • The voltage is 12 amps
  • One-year Warranty

  Get it now on Amazon.com


10. CASIL 22NF Power Boat Battery

CASIL 22NF Power Boat Battery - Deep Cycle Marine Batteries

[amazon box=”B07MLXWZ31″]

Here we have another maintenance-free and lead-free battery from CASIL. You can use it with trolling motors or cycle portable lams, test equipment, and more with it.

Furthermore, it has a closed structure to use in various positions and comes with an electrolyte suspension system. The low-pressure valve system offers safety when a pressure of 0-98 to 196.1kpa is reached.

Moreover, you can use it float or recycling method and should last up to four years.

Features
  • Comprise of an absorbent glass mat with sealed lead acid
  • The size is 9.02 (L) x 5.43 (W) x 9.13-inches (H)
  • You can buy it in a 55Ah capacity
  • Weighs 51.25lbs
  • The voltage is 12 amps
  • Consist of a low-pressure valve system
  • Used in float method, it should last up to 4 years

  Get it now on Amazon.com


Deep Cycle Marine Battery Comparison

MARINE BATTERY AGM/SLA SIZE WEIGHT CAPACITY BEST FOR CCA
OPTIMA YELLOWTOP YES 9.4 (L) X 6.8 (W) X 7.7 (H) 36.4LBS 48Ah DUAL PURPOSE 620A
UNIVERSAL POWER GROUP YES 8 (L) x 5.9 (W) x 8 (H) 22.5LBS 36Ah (75Ah) POWER SOURCE 315A
ODYSSEY 31-PC2150S YES 13 (L) x 6.8 (W) x 9.41 (H) 77.81LBS 100Ah STARTING 1150A
ODYSSEY THUNDER YES 13 (L) x 6.7 (W) x 9.3 (H) 71LBS 100Ah DUAL PURPOSE 1100A
VMAXTANKS YES 7.7 (L) x 5 (W) x 6.1 (H) 25LBS 35Ah POWER SOURCE 300A
OPTIMA BLUETOP YES 12.2 (L) x 6.8 (W) x 8.7 (H) 53.81LBS 66Ah DUAL PURPOSE 800A
OPTIMA 8006-006 34M YES 10 (L) x 6.9 (W) x 7.8 (H) 38.4LBS 55Ah STARTING 800A
BANSHEE YES 12.2 (L) x 6.8 (W) x 8.9 (H) _ 77Ah DUAL PURPOSE 800A
MIGHTY MAX YES 10.24 (L) x 6.61 (W) x 8.27 (H) 51.25LBS 75Ah STARTING _
CASIL YES 9.02 (L) x 5.43 (W) x 9.13 (H) 51.25LBS 55Ah POWER SOURCE _

Deep Cycle Marine Battery Buyer’s Guide

Before buying the best deep cycle marine battery, you need to know the purpose of it before using it on your boat. There are two types of marine batteries the starter one and a deep cycle one.

The starter battery you can use to crank up the motor to get it started. On the other hand, the deep cycle model helps keep your onboard devices working with 12 volts powered as well.

That is why a dual-purpose model is so great to use as it powers the engine and keeps your devices working at the same time.

So do you need a battery to use as a power source, or are you looking for a starter battery? Or are you looking for both? We recommend the dual purpose battery as the best choice.


What purpose does each model offer?

When you buy a starting marine battery, it helps to give the engine a sudden burst of power when cold. The construction has thinner plates, and using it for deep cycling can damage the plates.

Now using a deep cycle marine battery is a bit slower but gives a steady discharge supplying power to electronics as well. Therefore, it will not damage devices and maintains a capacity when charged fully.

You can use the battery to start an engine but may not have enough cold cranking amps to get it started. Instead, you can use a dual purpose deep cycle marine battery.

You can use the battery for starting an engine and power devices at the same time. Furthermore, they fit into tight spaces and do not have a hefty weight.


Different types of deep cycle marine batteries

As you will see, our list comprises of SLA (Sealed Lead Acid) batteries. Some of them are valve-regulated while the majority of them are not.

To prevent spillage, each one has an AGM (Absorbent Glass Mat) construction, making it maintenance free to use. On the other hand, you can use the battery in any position as it does not spill acid when place horizontal or vertically.

Moreover, when you use it with the right charger, it charges quickly.


So what is cold cranking amps?

The starting power is rated in CCA and is the amount of amperage provided to keep it maintained for 30 seconds at 7.2 volts at a temperature of 0° Fahrenheit.

If the battery has a 500 CCA, it can maintain up to ten volts while a 300 CCA only provides the bare minimum to start the engine.

Furthermore, the capacity measured in ampere-hours is just as important when choosing the right battery for your needs. If the battery has a 100Ah capacity, it can deliver five amps for 20 hours (measured in hours) or 20 amps for five hours.

Therefore, if the battery has a higher capacity, it can provide your appliances with more prolonged use. Another vital feature is the reserve capacity.

The capacity specifies how much minutes is needed for the battery to discharge, for example, 10.5 volts by 25 amps at 80° Fahrenheit.

The higher the rating, the longer it will last with a heavy load.


Other features to consider:

  • Dimension and weight – depending on your boat, you need to consider this factor. The bigger the deep cycle battery, the higher the capacity it has. So if you need more power for devices, you will need to connect several batteries. Furthermore, you need to know how portable it is as well for storage.
  • Battery box – as the marine battery is exposed to different elements, you may need to buy a battery box to keep it protected. There are different types available comprising USB ports, more water-resistant than others, and some even display the battery life info.

How do you take care of the battery?

No matter which deep cycle marine battery you buy it needs to be serviced, and you can prolong its use by doing the following:

  • Use it on a trickle charge
  • You can install a quick-charging port to use with trickle charging
  • Always consult the manual included with the battery
  • To keep the terminals in tiptop condition, you can rub it with some Vaseline as it prevents corrosion
  • Always check the temperature you use the battery in as excessive cold or heat can damage the battery

We hope that our in-depth deep cycle marine battery guide helps you to select the best one on the reviewed list. Always look at your power needs from the engine to onboard devices before buying one.

Look at the space needed to mount the battery and consider the weight as well as it will allow you to move it back to storage with ease.

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