Epoch 36V 100Ah Lithium Trolling Motor Battery B36100A-A, 3.84kWh LiFePO4, Heated, Bluetooth, IP67 Marine

About the Epoch 36V 100Ah Lithium Trolling Motor Battery

This is the big-tank option for a 36V trolling motor. One case takes the place of three 12V lead-acid batteries and their series jumpers. Epoch says it does so with far less weight. You get 3.84kWh of LiFePO4 on a single pair of terminals: one charger connection, one set of motor leads and one state of charge to watch.

Epoch plans runtime on about 80% of nominal energy, roughly 3,072Wh per battery. That's about 8 hours at an average 10A draw, or about 6.1 hours at a steady 500W. It has room for hard work too. It runs 120A continuous, with a 200A peak that holds for up to a full minute when you're pushing into wind or current.

36V 100Ah vs 36V 50Ah: Which Trolling Motor Battery Fits Your Boat

Pick the 100Ah when runtime matters most and you have room for one larger case. It measures 11 x 10.25 x 20 in and weighs 75 lb, with IP67 immersion protection and the meter in the box. The Epoch 36V 50Ah Essentials fits a Group 31 footprint at 35 lb. It carries an IP65 rating against water jets and is rated for 4,000+ cycles.

Two matched 50Ah batteries in parallel also make 100Ah, split into two lighter cases that can sit in separate compartments. A single 100Ah keeps everything on one pair of terminals and gives you the longer 60-second peak. Deciding between one large battery and two smaller ones for your motor? Our team is happy to help with sizing.

Heated Charging, Bluetooth and the Included Battery Meter

An internal heater warms the cells before charging in cold weather. With heating, the battery accepts a charge from -4°F (-20°C), while the cells themselves charge from 32°F (0°C). During warm-up, the app may show little or no charge current. Leave the charger connected, and charging carries on once the cells are ready.

The Epoch Li-Ion app (iOS and Android) shows state of charge, voltage, current, temperature, cycle data and battery status. The 10-segment meter shows charge in 10% steps and flashes an alarm at 10%, so you can check the battery without opening your phone. Mount the meter somewhere dry and visible. Route its cable away from sharp edges, heat and standing water.

Installing a 36V Trolling Motor Battery: Fusing, Cables and Charging

Mount the battery upright on a tray, strap or bracket rated for 75 lb. Land the motor leads on the M8 female terminals with clean, properly crimped lugs. Get the terminal torque for this model from Epoch support. Epoch calls for a fuse or DC-rated breaker as close as practical to the positive terminal, sized to protect the smallest wire. Loads, cable and protection get sized to the 120A continuous rating, not the 60-second peak.

Cable size depends on the motor's current, the run length and voltage drop. Our custom battery cable builder makes matched leads to length from 6 AWG to 4/0 AWG.

For a parallel bank of up to four matched batteries, charge each one fully and switch them off before wiring. Keep cable lengths and gauges equal, and protect the bank's main positive with a Class-T fuse. Charge with a 36V charger, converter or charge controller set to a LiFePO4 profile. For alternator charging, Epoch highly recommends a DC-to-DC charger.