Battery Life Calculator

Formula and Units

Battery life is an estimate based on capacity and average current draw.

Formula: runtime = capacity / current x usable capacity.

Understanding Battery Life

1. What This Calculator Measures

Battery life estimates how long a battery can power a load at a given current draw.

2. How the Calculation Works

Capacity and current are converted to amp-hour and ampere units, then adjusted by usable capacity percentage.

3. Formula or Rule Used

runtime = capacity / current x usable capacity.

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