Lithium Marine Batteries

Power Your Aquatic Adventures

Cruisers, racers and anglers want to spend as much time on the water as possible. Long-lasting RELiON lithium iron phosphate (LiFePO4) batteries fit all types of watercraft and deliver the dependable power for everything you need, from punching your holeshot in competition to running your A/C at the dock.

See Our Selection Of Lithium Marine Batteries

Lithium Benefits for Marine

RELiON lithium batteries are built to last and designed to perform. Lightweight, durable and maintenance-free, our batteries charge quickly, store safely, and withstand the harshest temperatures and conditions.

Drop-in Replacement

RELiON lithium batteries are available in a variety of BCI standard sizes for easy drop-in replacement. Looking for a custom solution? No problem! Our engineering team can design the best system for your needs.


RELiON lithium batteries provide more power than traditional lead-acid batteries and are typically half the weight. This makes for better acceleration and more agility on the water.

Constant Power

RELiON lithium batteries provide long-lasting energy for all your marine needs, so run the A/C, the fish finder or the trolling motor and know that you have ample reserves.

No Maintenance

RELiON lithium batteries are maintenance free – no watering; no corrosion. In addition, they can be charged more quickly using standard plug-in, alternator, generator, or solar systems. Partial charging does not affect performance, and a low self-discharge rate means worry-free storage.

Temperature Tolerant

RELiON lithium batteries are designed to perform in harsh conditions–freezing cold, scorching heat or rough waters.


RELiON lithium batteries are the ultimate clean energy. No gassing, no fumes and no pollution. Enjoy reliable power, while protecting the environment, using these non-hazardous batteries.

High Performance

Built to last, designed to perform, premium RELiON lithium batteries deliver unsurpassed performance on the water. We back this claim with a comprehensive, 10-year warranty.

Paring Mercury Marine® Outboard Engines with RELiON® Lithium Batteries

Upgrade Your Sailing Adventures with Lithium Batteries

Lithium Batteries For Fishing Boats

RELiON LiFEPO4 batteries give exceptional power for your entire fishing system

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Lithium Batteries for Sailboats

With onboard systems hosting a wide array of technologies and navigational tools it is crucial to take your power requirements into consideration. The marine elements can be harsh on equipment and durability is second to none. RELiON deep cycle lithium marine batteries offer excellent corrosion resistance as well as longer run times.

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Powering Sailing Adventures Around the World

Wes and Savana are entrepreneurs and former van lifers who recently made the switch to living fully off-grid on their boat to further maximize family time, adventuring, greater work-life balance, and being closer to nature.

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Lithium Energy Storage Solutions Provide Savings for Solar Boat Business

Sub Sea Systems, a global marine tourism company, transitions its solar-plus storage powered boats from lead-acid batteries to longer lasting, lighter and more reliable lithium energy storage solutions.

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Find the Right Battery for your Application

Try our lithium battery selector tool.

Lithium Battery Selector