Kayak Lithium Batteries
Power Your Adventure With Thor
Rig Smarter. Fish Longer. Go Further.
In a kayak, space and weight are everything. Every square inch and pound impacts your stability and performance. Thor Lithium kayak batteries deliver a steadier, more consistent voltage in a lighter (up to 70%), more compact package than any lead-acid alternative, so you can rig smarter, maneuver easier, fish longer, and stop worrying about what your battery is doing.
Don't Let Your Battery Decide When the Day Ends.
Every Thor Lithium Kayak Battery is built with the features that matter most when you're on the water. No shortcuts, no compromises. Just reliable power backed by technology and people you can count on.
Questions About Your Kayak Build?
The right 12V battery size for your kayak depends on what you’re powering and how long you plan to be on the water. For most anglers running a fish finder, GPS, and basic accessories, a 12V battery in the 10Ah to 30Ah range covers a full day comfortably without adding meaningful weight to the kayak. If you’re running high-draw forward-facing sonar like Livescope or ActiveTarget, step up to a 48Ah or 63Ah to handle the sustained power demand without voltage sag affecting your unit’s performance. Running a 12V trolling motor in addition to electronics? Go with a 63Ah to 100Ah so you’re not splitting capacity between your motor and your sonar. Not sure where to start? Call us and we’ll help you dial in the right size for your specific setup.
In most cases, no. Thor Lithium batteries use LiFePO4 chemistry, which requires a charger specifically compatible with lithium. Many older chargers and those designed exclusively for lead-acid or AGM batteries use float voltages and charge profiles that don’t match lithium chemistry. Using an incompatible charger can affect long-term battery performance and may void your warranty. Before connecting any existing charger to a Thor Lithium battery, check your charger’s specifications for a lithium or LiFePO4 setting. A compatible 12V lithium charger should charge to 14.4V to 14.6V. If you’re unsure whether your current charger is compatible, give us a call before you plug in. Thor Lithium chargers are matched specifically to our battery chemistry and are the recommended charging solution for any Thor Lithium battery.
For fish finders, GPS units, and basic kayak electronics, a 12V 10Ah to 30Ah battery will power your setup through a full day on the water. If you’re running high-draw forward-facing sonar like Livescope, ActiveTarget, or a 360-degree system, step up to a 48Ah or 63Ah to handle the sustained power demand without voltage sag affecting your unit’s performance. Thor Lithium batteries 48Ah and above include built-in Bluetooth monitoring, so you can keep an eye on your charge level throughout the day directly from your phone. Many serious kayak anglers run two separate batteries, one for the trolling motor and one for electronics, to maximize runtime on both systems.
Runtime depends on the power draw of your specific unit and the capacity of your battery. Most standard fish finders draw between 0.5 and 2 amps per hour. A 12V 10Ah Thor Lithium battery will run a 1-amp fish finder for approximately 8 to 10 hours of continuous use, and a 20Ah battery extends that to 16 to 20 hours. Because Thor Lithium batteries maintain a flat, stable voltage throughout their discharge cycle, your fish finder stays sharp and responsive from the first hour to the last, unlike lead-acid batteries that lose voltage gradually and affect unit performance as they deplete. Check your unit’s spec sheet for its exact power draw, and we can help you match the right battery to your setup.
Yes, and it’s worth understanding why. Thor Lithium batteries use lithium iron phosphate (LiFePO4) chemistry, which is fundamentally different from the lithium cobalt oxide chemistry found in consumer electronics like phones and laptops. LiFePO4 is chemically stable, non-flammable under normal operating conditions, and purpose-built for the demands of life on the water. Every Thor Lithium battery includes a built-in Battery Management System that continuously monitors cell voltage, temperature, and current draw. If any condition falls outside safe operating parameters, the BMS responds automatically before damage can occur. LiFePO4 batteries do not leak acid, do not vent explosive hydrogen gas, and do not carry the thermal runaway risk associated with other lithium chemistries. They are, by most measures, the safest deep-cycle battery chemistry available for kayak use.
Thor Lithium batteries are built to handle the elements, but we recommend housing them in a battery box or waterproof enclosure on a kayak, particularly in open setups where the battery is exposed to splash, spray, or the risk of a capsize. The built-in Battery Management System provides protection against short circuits and electrical faults, but proper housing is always the right practice on the water. For anglers fishing in saltwater environments, a sealed enclosure is especially important. When in doubt, box it up. A quality battery box is cheap insurance on a kayak.
