Battery Life Calculator

Enter battery capacity, load current, and efficiency to calculate operating hours, days, watt-hours, and charge cycle estimates.

Battery Capacity (mAh)

Load Current (mA)

Efficiency (%)

Nominal Voltage (V)

Battery Life

hours

Days

—

Watt-Hours

—

Power Draw

—

Est. Charge Cycles

—

Battery Life Formulas

Life (h) = Capacity (mAh) × Efficiency / Load (mA)

Wh = Capacity (mAh) × Voltage / 1000

Power = Voltage × Load Current

Solar sizing.

V=IR.

RC time constant.

Trace width.

Op-amp gain.

Convert units.