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Battery Life Calculator

How long a battery lasts at given current draw

Battery Life Calculator

Capacity (mAh)
Current Draw (A)
Voltage (V)

Battery life is calculated from capacity (mAh), discharge current (amps), and voltage. Watt-hours = mAh × Voltage ÷ 1000, and runtime = Watt-hours ÷ Power draw (Watts).

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Tip: Lithium batteries should not be fully discharged — keep above 20% to maximise cycle life.

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