Trolling Motor Battery Runtime Calculator
Enter your battery's amp-hour rating and your trolling motor's amp draw at your typical speed setting to estimate how long your battery will last on the water.
Estimated Runtime
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Usable Amp-Hours—
Estimated Runtime (hours)—
About this calculator
Estimate how many hours your trolling motor battery will last on a fishing trip based on battery capacity, motor draw, and speed setting.
Frequently Asked Questions
Why should I not use 100% of my battery's rated capacity?
Fully discharging most batteries, especially lead-acid types, shortens their lifespan. Most anglers plan around 50-80% usable capacity to protect the battery and leave a safety margin.
How do I find my motor's amp draw?
Check your trolling motor's manual, which usually lists amp draw at various speed settings. Draw increases significantly at higher speeds.
Does water temperature affect battery runtime?
Yes, cold temperatures can reduce battery capacity and runtime, so actual results may vary from this estimate in cold weather.