Battery Life & Runtime Calculator

Estimate real-world operating time of battery powered systems factoring in discharge derating.

Battery Capacity mAh

Device Average Current mA

Discharge Efficiency %

Runtime in Hours (hours)

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Runtime in Days (days)

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Lab Gear (Amazon (voltcraft-20))

Tested and recommended for reliable hardware prototyping and accurate measurements.

        T = \frac{\text{Capacity} \times \eta}{I_{load}}
      

Chemical batteries suffer from self-discharge, voltage sag, and temperature variations, rarely delivering 100% rated capacity.