Jump On the Lithium Wave

Cruisers, racers and anglers are upgrading to lithium batteries due to the many advantages over traditional lead-acid alternatives. RELiON lithium iron phosphate batteries fit all types of watercraft and recreational vehicles and deliver the dependable power needed for life on the water or off the grid. Lightweight, durable and maintenance-free, our batteries charge quickly, store safely, and withstand the harshest temperatures & conditions.

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Lithium Advantages

Compared to lead-acid and other lithium batteries, lithium iron phosphate batteries offer significant advantages, including improved discharge and charge efficiency, longer life span and the ability to deep cycle while maintaining power. LiFePO4 batteries often come with a higher price tag, but a much better cost over the life of the product. No maintenance and super long life make them a worthwhile investment and a smart long-term solution.

More Usable Capacity

Lithium batteries allow you to use 100% of their capacity, regardless of the rate of discharge. So, run all your electronics and know that you have ample reserves.

Longer Life

RELiON lithium batteries provide up to 10 times longer life than lead-acid batteries, and they still provide 80% of rated capacity after 2,000 cycles.

Partial State of Charge Tolerance

Partial charging does not affect performance quality or battery life. A low self-discharge rate means worry-free storage so even occasional users can be assured of reliable performance.

Constant Power

Full power available throughout discharge. Voltage does not drop like lead-acid.

Lighter Weight

50-60% less weight than lead-acid equivalent.


Plug, play and charge. No watering.

Temperature Tolerance

2.5X more efficient operation at low temperatures. Safely operational up to 149°F (65°C).

Installation Flexibility

Can be installed upright or on its side.

Lead is Dead

Check out the chart below to compare the performance advantages of advanced lithium technology versus traditional lead-acid batteries.

Lithium Vs. Lead-Acid Comparison

Lead Is Dead Chart

Our Products

RELiON has one of the largest LiFePO4 product offerings available in a variety of BCI standard sizes for easy drop-in replacement.

Marine Lithium Batteries


Products Engineered in the USA

Our Seattle-based engineering team works hand-in-hand with our manufacturing facilities to ensure quality products that perform. Not only are we committed and able to deliver the best products, but we are proud to say our factory is ISO 9001:20015 certified.

Unparalleled Expertise

When you become a RELiON customer, know that you have a talented team of experts behind you. Our team has been in the industry for 20+ years with over 190 years of combined battery experience. We only invest in people with industry experience, which is why we can say our technical know-how is truly unmatched.

Product Innovation

Today, the industry demands innovation that delivers unmatched power, performance, and life. RELiON LiFePO4 batteries accomplish this and surpass existing batteries in the market due to our focus on product development. We have one of the largest LiFePO4 product offerings available with 12V, 24V and 48V batteries that power a range of applications.

Peace of Mind

Not only do RELiON lithium batteries work hard so you can play hard, they're an inherently safe chemistry and engineered with exclusive safety measures, including state-of-the-art battery management system (BMS) that protects against over-charge, over-discharge, over-temperature and short circuit conditions.

A Brand Within ASG By Brunswick

We are proud to be a part of Brunswick's Advanced Systems Group (ASG) which consists of leading P&A brands in advanced batteries, electrical power management, digital control & monitoring, and networked systems & devices for the marine, RV, specialty vehicle, and other industries.

Customer Success Stories

"I'm able to explore further and for more hours on end with my customers. I never worry about whether I'll be stranded or what type of water I can or can't traverse. The focus is entirely on the experience of fly fishing and appreciating nature. I now have the reliable power I need in an ultralight package to enable the best possible backcountry fly fishing experience for my customers five days a week."

- JT Vanzandt

"I switched to lithium due to the significant weight savings and much greater power output. Every other boat on the water starts to slip, and its batteries start to die, very early on in the day. Most boats just can't hang with mine. My customers and I usually end up having the water to ourselves the whole second half of the day. Even as I spend the whole charter running my trolling motor at 75-85%, most everyone else I see has to turn around and head back two to three hours before me. The power output from these lithium batteries is absolutely amazing."

-Capt. Leon Dana