Among the various types of marine batteries available, deep cycle batteries are known for their ability to provide sustained power over long periods of time. However, with so many deep cycle marine batteries on the market, it can be challenging to determine which one is the best fit for your needs.
In this article, we’ve compiled a list of the top 5 best deep cycle marine batteries on the market based on factors such as durability, capacity, and overall performance. Whether you’re an avid daily boater or a weekend warrior, this guide will help you find the right deep cycle battery for your marine needs.
Best Deep Cycle Marine Battery: Quick Picks
This battery is known for its excellent performance, with a high capacity of 28Ah and a deep discharge cycle of up to 80%. It's also incredibly durable, with a tough construction that's resistant to shock and vibration. It has a 3-10 year service life, depending on usage and maintenance.
This battery is designed to provide both starting power and deep cycle power, making it an excellent choice for boats that need to power both engines and onboard electronics. It has a high cranking power of 750A and a capacity of 55Ah as well as a maintenance-free design and a long lifespan.
This battery is made with advanced lead calcium alloy, which provides exceptional performance and durability. It has a high capacity of 125Ah and can provide sustained power over long periods of time. It is also maintenance-free and has a long lifespan with an average service life of 10 years.
Best Deep Cycle Marine Batteries: Full Reviews
This is one of the best overall deep cycle marine batteries on the market, known for its excellent performance and durability. It has a high capacity of 28Ah and has plenty of vibration resistance for rough waters.
- Deep discharge cycle up to 80%
- Resistant to shock and vibration
- Long lifespan of 3-10 years
This battery is a great choice for boaters who need a high-capacity battery that can provide sustained power over long periods of time. It has a capacity of 125Ah and fast recharging capabilities.
- Can provide up to 8 hours of continuous use
- Sealed construction for maintenance-free operation
- Durable design with thick plates and grids
This 12V battery is designed to provide reliable power in a variety of applications with a high capacity and long lifespan. It has a low self-discharge rate with a wide operating temperature range.
- Capacity of 100Ah
- Long lifespan of up to 10 years
- Maintenance-free AGM construction
This dual-purpose deep cycle battery is an excellent choice for boats that need reliable starting power and deep cycle capabilities. It's resistant to shock and vibration and has a long lifespan of up to 3 times longer than traditional batteries
- High cranking power of 750A
- Deep cycle capacity of 55Ah
- Maintenance-free design
This deep cycle marine battery is a budget-friendly option that still provides reliable power and durability. It has a capacity of 35Ah and offers maintenance-free AGM construction.
- Resistant to shock and vibration
- Wide operating temperature range
- Long lifespan of up to 3 years
Deep Cycle Battery Buyer’s Guide
Types of Marine Battery
Flooded Lead Acid Batteries
These are the most common type of marine battery and have been used for many years. They are affordable and reliable but require maintenance on a regular basis, such as adding water to top up the levels.
Absorbent Glass Mat (AGM) Batteries
These batteries use a fiberglass mat soaked in an electrolyte liquid, making them maintenance-free and unable to be spilled. They are more reliable than flooded lead acid batteries but can cost more.
These batteries use an electrolyte in a gel format instead of a liquid. They can also be more expensive than lead acid and AGM batteries but can be much more durable.
These batteries are the most expensive option but offer the longest lifespan and the highest performance. They are lightweight and have a high energy output making them ideal for boats with limited space. They also have a very low self-discharge rate, so they can be left for long periods of time without needing to be recharged.
Marine Starting Battery
Marine starting batteries are designed to provide a burst of power to start a boat’s engine. Unlike deep cycle batteries, which are designed to provide sustained power over long periods of time, starting batteries are built to deliver high bursts of power for a short time. They are sometimes referred to as “cranking batteries” or “starter batteries.”
When choosing a marine starting battery, it’s important to consider the type of engine it will be used for, as well as the size and power requirements of the engine. It’s also important to choose a starting battery with sufficient cold cranking amps (CCA) to start the engine in cold temperatures, as well as a high reserve capacity to ensure reliable starting power.
Marine Deep Cycle Battery
Marine deep cycle batteries are designed to provide sustained power over a long period of time. They are used to power accessories such as trolling motors, fish finders, radios, and lights, as well as to provide backup power for onboard electronics and systems.
When choosing a marine deep cycle battery, it’s important to consider the capacity, lifespan, and maintenance requirements of the battery. It’s also important to choose a battery with the right voltage and size for the boat’s electrical system, as well as one that is rated for marine use and able to withstand the harsh marine environment.
Marine Dual-Purpose Battery
Marine dual-purpose batteries are designed to provide both starting power and deep cycle power in a single battery. They are a good option for boats with limited space or power requirements, as they can provide the benefits of both starting and deep cycle batteries in a single unit.
Marine dual-purpose batteries are a good choice for boats with moderate power needs and limited space since they can provide reliable starting power as well as sustained power for accessories in a single battery. However, for boats with higher power requirements, dedicated starting and deep cycle batteries may provide better performance and a longer lifespan.
Marine Battery Maintenance & Storage Tips
Charge the Battery Regularly
Marine batteries should be charged after each use and left on a charger during extended periods of storage. It’s important to avoid overcharging the battery too often, as this can shorten its lifespan.
Keep the Battery Clean
Dirt and debris can build up on the battery terminals, which can lead to poor performance and even battery failure. Use a wire brush and baking soda solution to clean the terminals and prevent corrosion.
Check the Water Level
If you have a flooded lead-acid battery, it’s important to check the water level regularly and add distilled water as needed to prevent the plates from being exposed to air.
Store the Battery Properly
If you won’t be using your boat for several months of the year, remove the marine battery and store it in a cool, dry place. Be sure to disconnect the marine battery cables to prevent any electrical drain when not in use.
Test the Battery Regularly
Use a marine battery tester to check the voltage and overall health of the battery. If the boat battery is showing signs of weakness, it may need to be replaced.
Avoid Extreme Temperatures
Marine batteries should be stored in a cool, dry place to avoid exposure to extreme temperatures which can damage the battery and shorten its lifespan.
Use the Right Charger
Be sure to use a charger specifically designed for your type of marine battery. Using the wrong boat battery charger can damage the deep cycle marine battery and shorten its lifespan.
Deep Cycle Battery Safety
Wear Protective Gear
When handling marine batteries wear gloves and eye protection to protect yourself from acid and other chemicals.
Follow Manufacturer Instructions
Always follow the manufacturer’s instructions for charging, installation, and maintenance of the marine starting battery.
Keep the marine battery terminals clean and avoid touching them together, which can cause a short circuit and potentially start a fire.
Handle With Care
Marine batteries are heavy and can be difficult to move or carry. Avoid dropping or mishandling the marine battery.
Keep Batteries Away From Heat Sources
Deep cycle batteries should be kept away from heat sources such as heaters which can cause the marine battery to overheat and potentially explode.
Deep cycle batteries release hydrogen gas during charging which is highly flammable. Be sure to charge the marine battery in a well-ventilated area to avoid a buildup of gas.
Use the Right Charger
Always use a charger specifically designed for your type of marine deep cycle battery. Using the wrong marine battery charger can damage the marine battery and pose a safety hazard.