36V 50Ah LiFePO4
The light, budget-friendly 36V option. 1,920Wh handles a casual half-to-full day of intermittent trolling in a 33 lb Group 31 case — but if you spot-lock in wind or troll hard all day, step up to the 100Ah version; 50Ah will run out before you do.
Buy at LiTime.com →LiTime 36V 50Ah TM · Partner product — the purchase completes on LiTime's site, and LiTime ships and supports the battery directly with a 5-year warranty.
36V lithium needs a 43.8V LiFePO4 charger — no standard marine charger covers it. This is the matching waterproof unit; 25A refills the battery in about 2 hours.
Get the matching charger at LiTime.com →Disclosure: we may earn a commission on purchases made through these links, at no extra cost to you.
Specifications
| Capacity | 50Ah / 1,920Wh |
| Weight | 33.1 lbs (vs ~180 lbs for three Group 31 lead-acids) |
| Size | 13.0" × 6.77" × 8.5" — Group 31 |
| Continuous discharge | 50A BMS |
| Cycle life | 4,000 cycles at 100% depth of discharge (per LiTime) |
| Low-temp protection | Yes — charge cutoff below 32°F, discharge to -4°F |
| Waterproof rating | IP65 |
| Terminals | M8 bolt |
| Warranty | 5 years |
Why LiFePO4 beats lead-acid
- It outlasts 8–10 lead-acid batteries. A deep-cycle lead-acid gives you 300–500 cycles; this battery is rated for 4,000+. Over a decade of fishing, lead-acid costs more in replacements alone — before you count the Saturdays lost to a dead bank.
- All of its capacity is usable. Draining lead-acid past ~50% wrecks it, so a "100Ah" lead-acid is really a 50Ah battery. LiFePO4 delivers essentially its full rating.
- Full thrust to the last cast. Lead-acid voltage sags as it drains — your motor gets weaker all day. LiFePO4 holds voltage nearly flat, so the motor pulls the same at 4pm as it did at first light.
- A fraction of the weight in the bow — where weight matters most for how the boat rides. See the spec table above for the exact numbers versus the lead-acid bank this replaces.
Why we recommend LiTime
- Purpose-built trolling line — these are LiTime's TM/marine models: IP65-sealed, shock-rated, with low-temperature protection built into the BMS. Not a repackaged RV battery.
- Dedicated-voltage design — one battery instead of a series bank means no wiring to get wrong and no mismatched batteries aging each other.
- 5-year warranty, US support — LiTime is one of the largest-volume LiFePO4 brands, ships from US warehouses, and stands behind the battery directly.
- Roughly half the price of boutique brands for the same chemistry and a comparable warranty. We'd rather you spend the difference on fuel.
Mounting the motor too?
Our reversible aluminum bow plate fits virtually every center console — and both 4-bolt and 6-bolt puck patterns.
View the trolling motor mount — $275