Trolling Motor Lithium Batteries

The right battery size depends on your motor’s voltage requirement and how long your average day on the water lasts. Most trolling motors run on 12V, 24V, or 36V systems.

12V motors are typically 30 to 55lb thrust and work well for smaller boats and kayaks.

24V motors run in the 55 to 80lb range and are common on mid-size bass boats and center consoles.

36V motors deliver 80lb thrust and above and are the standard for tournament-level performance and offshore competency.

From there, amp-hours determine runtime. The higher the Ah rating, the longer your motor runs between charges. Thor Lithium batteries can be safely discharged to 80 to 100% of their rated capacity, which means significantly more real-world runtime than an equivalent lead-acid battery. Call us and we’ll help you size the right setup for your boat.

Yes, and the difference is immediately noticeable. Lead-acid batteries lose voltage as they discharge, which means your trolling motor gradually slows down as the day goes on. Thor Lithium batteries maintain a flat, stable voltage curve from start to finish, so your motor runs at the same thrust level in hour eight as it did in hour one.

Combined with the significant weight reduction compared to lead-acid, most anglers notice improved boat handling, better fuel efficiency on the outboard, and a more responsive trolling motor from the moment they make the switch.

In many cases, yes. A single Thor Lithium 24V battery can replace two 12V lead-acid batteries wired in series, and a single Thor Lithium 36V battery can replace three 12V batteries wired in series.

Beyond the obvious simplification of your electrical system, you’re removing significant weight from the bow, gaining more usable capacity, and eliminating the maintenance that comes with multiple lead-acid batteries.

The key requirement is using a lithium-compatible charger designed for your new battery’s voltage. Call us before you make the switch and we’ll walk you through the setup.

Runtime depends on your motor’s thrust rating, what speed you’re running, and the capacity of your battery.

As a general reference, a 12V 100Ah Thor Lithium battery running a 55lb thrust motor at medium speed will typically deliver 6 to 10 hours of runtime.

At high speed, that number comes down. At low to medium speeds, it can go higher. Because Thor Lithium batteries are rated for 80 to 100% depth of discharge, you’re getting significantly more usable runtime out of the same amp-hour rating compared to lead-acid.

For specific runtime estimates based on your motor and fishing style, give us a call.

Yes. Thor Lithium batteries require a charger specifically compatible with LiFePO4 chemistry. Many modern marine onboard chargers include a lithium setting, but it is important to confirm compatibility before connecting. Using a charger designed for lead-acid or AGM batteries can affect performance and may void your warranty.

Thor Lithium chargers are matched specifically to our battery chemistry and are the recommended charging solution for any Thor Lithium battery. If you’re unsure whether your existing charger is compatible, call us before you plug in.

Most folks don’t realize that a 24V or 36V motor works harder as a battery’s voltage drops. With a Thor battery and a Thor lithium battery charger, your motor stays at peak efficiency all day. Using our single-bank chargers simplifies your bilge layout, removing pounds of ‘charger clutter’ and making it easier to troubleshoot your system. One charger, one bank, zero excuses.