Battery Guide for Electric Outboards

To power your electric outboard, you will need a Deep Cycle (Leisure) Battery. Based on our experience, an 85Ah battery is an ideal size for most applications.

⚡ Important: Some motors require 24V, which means you’ll need two 12V batteries connected in series.

How to Calculate Running Time

A simple way to estimate running time is:

Battery Capacity (Ah) ÷ Motor Amp Draw = Approx. Running Time (hours)

💡 Rule of Thumb: An electric outboard will generally draw 1 Amp per Pound of Thrust at maximum speed.

Example:

  • Motor: 55LB thrust

  • Battery: 85Ah

  • Calculation: 85 ÷ 55 = ~1.5 hours of full-power use

👉 At lower speeds, the motor draws significantly less current (around ¼ of the maximum draw), meaning your battery will last much longer when cruising slowly.

Recommended Batteries (All fit the Bison Battery Box):

  • EXV24MF Enduroline Leisure Marine Battery 85Ah

    • Cost-effective Lead Acid Leisure Battery

    • Standard, reliable choice

  • ECOWORTHY 12V 100Ah LiFePO4 Lithium Battery

    • Mid-range Lithium option

    • Lightweight, long-lasting, and compatible with both brushed and brushless motors

    • Rapidly becoming the most popular choice

  • Fogstar Drift 12V 105Ah Lithium Leisure Battery

    • Premium Lithium battery

    • Excellent performance in very cold weather and for year-round use

✅ Choosing the right battery ensures longer running times, reliable performance, and safer operation of your electric outboard.