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Best Lithium Batteries for Trolling Motors (12V/24V/36V)
A lithium trolling motor battery is a deep-cycle LiFePO4 bank that powers an electric fishing motor, offering 100% usable capacity, half the weight of AGM, and all-day runtime on a single charge. Here is how to pick the right one.
Match Battery to Motor Thrust & Voltage
Thrust dictates voltage: 30–45 lb thrust runs on 12V; 55–80 lb needs 24V; 80–112 lb needs 36V. 24V and 36V systems are built by wiring two or three 12V LiFePO4 batteries in series.
How Much Ah Do You Need?
A 55 lb motor for 4 hours needs ~100Ah; an 80 lb motor for 6 hours needs 2x100Ah (24V); a 112 lb motor for 8 hours needs 3x100Ah (36V). More thrust and longer days mean more amp-hours.
Why LiFePO4 Beats AGM for Trolling
Weight is critical on a small boat. Lithium is about half the weight, gives 100% depth of discharge, and holds voltage steady under load—so thrust stays consistent to the last minute instead of sagging like lead-acid.
Runtime & Charging
Pair your bank with a LiFePO4 charger and, on larger rigs, a DC-DC charger from the outboard so you recharge while running. Solar works for slow top-ups at the cabin.
Cold & Wet Considerations
Use an IP-rated case and keep terminals dry. In freezing weather, choose cells with a low-temperature charge cutoff (or self-heating) so you never charge below 0°C.
Trolling-Specific BMS
Trolling draws a steady, high current. Spec a BMS with a high continuous discharge rating plus over-current and short-circuit protection.
Trolling Motor Battery by System Voltage
| Motor thrust | Voltage | Recommended bank | Typical runtime |
|---|---|---|---|
| 30–45 lb | 12V | 1x100Ah | 4–6 h |
| 55–80 lb | 24V | 2x100Ah | 5–7 h |
| 80–112 lb | 36V | 3x100Ah | 6–9 h |
EGbatt supplies lithium trolling motor batteries, marine LiFePO4 batteries, and custom trolling packs built for the water.
Can I run a 24V trolling motor on one 12V lithium battery?
No. A 24V motor needs 24V input—use two 12V LiFePO4 batteries in series, or one 24V LiFePO4 pack. Under-voltage will starve the motor.
How many amp-hours for an 80 lb trolling motor?
For 5–7 hours of typical use, plan 2x100Ah (24V). Add a third battery if you fish long days or run at high thrust constantly.
Are lithium trolling batteries safe in rain?
Yes with an IP-rated case and sealed terminals. Keep connections dry and use marine-grade fuses; the BMS handles fault protection.
Can I charge my trolling battery from the outboard?
Yes—use a DC-DC charger (alternator to lithium) so the engine charges the LiFePO4 safely with the correct profile.
Do I need a special charger for a 36V lithium bank?
A 36V LiFePO4 bank (three 12V in series) charges with a 36V LiFePO4 charger, or a 12V charger per battery. Never use a lead-acid profile.
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