Lithium Marine Batteries

Navigate Farther, Fish Longer – High-Performance Lithium Batteries for Your Boat

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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

Lightweight, durable, and maintenance-free, RELiON marine batteries charge fast, store safely, and withstand the harshest 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.

Lightweight

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.

Temperature Tolerant

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

Eco-Friendly

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.

​Fast Charging

Spend less time waiting and more time on the water—RELiON lithium batteries charge up to 5X faster than traditional lead-acid batteries, getting you back to your adventures quickly.

Top Lithium Marine Batteries

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RB100 12V 100Ah Lithium Marine Battery

$899.95

Power your boat with confidence using the RELiON RB100, a 100Ah lithium marine battery built for lasting performance. Lightweight and maintenance-free, it charges fast, outlasts lead-acid batteries, and withstands harsh marine conditions—keeping you on the water longer.

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RB100-HP High Performance Dual Purpose Lithium Battery

$999.95

The RELiON RB100-HP is a powerful 12V 100Ah lithium marine battery designed for high-demand applications. With a 100A continuous discharge and up to 800A peak, it delivers instant power to start your boat's motor and run essential electronics. Weighing just 29.8 lbs, it charges faster, lasts longer, and withstands harsh marine conditions—all with maintenance-free reliability.

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RB36V40 36V 40Ah LiFePO4 Battery

$1,089.95

The RELiON RB36V40 is a lithium battery designed for marine electronics and trolling motors. Delivering consistent power with a lightweight, maintenance-free design, it ensures longer run times, faster charging, and a longer lifespan than traditional lead-acid batteries. Built to handle tough marine conditions, the RB36V40 provides reliable, efficient energy to keep your equipment running smoothly on the water.

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Find the Right Batteries to Enhance Your Boat's Performance

Try our lithium battery selector tool.

Lithium Battery Selector

Paring Mercury Marine® Outboard Engines with RELiON® Lithium Batteries

Upgrade Your Sailing Adventures with Lithium Batteries

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Lithium Batteries For Fishing Boats

RELiON deep cycle lithium marine batteries deliver reliable, long-lasting power for fishing boats, ensuring uninterrupted use of trolling motors and electronics. With faster charging, lighter weight, and superior durability, they withstand harsh marine conditions—so you can focus on the catch.

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Lithium Batteries for Sailboats

With advanced onboard tech, reliable power is key for sailing. RELiON deep cycle lithium marine batteries provide durability, corrosion resistance, and longer run times to withstand harsh marine conditions, keeping your navigation and sailing systems powered.

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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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