How long will your battery last? Enter capacity and load — current draw or wattage — and get runtime with a realistic discharge factor.
Lead-acid and alkaline batteries can't be fully drained — we account for it.
Enter current directly, or convert wattage using your battery voltage.
From tiny Li-Po packs to large 12 V deep-cycle batteries.
Runtime in hours, minutes and full days where applicable.
Measure, power and optimize your gear.