Battery Life Estimator

Power Interactive calculator

Assumes a constant current draw and optional derating factors for usable capacity and efficiency.

Formula

Runtime = capacity × usable fraction × efficiency / load current.

Estimate runtime from battery capacity and load current.

Battery Capacity mAh

Unit-aware entry, e.g. 2400mAh or 2.4Ah.

Load Current mA

Unit-aware entry, e.g. 200mA or 0.2A.

Usable Fraction

Optional derating as 0 to 1 or 0% to 100% (e.g. 0.8 or 80%).

Efficiency Fraction

Optional efficiency as 0 to 1 or 0% to 100% (e.g. 0.9 or 90%).

All values are unit-aware and validated before computation.