Battery Life Calculator

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Inputs

Battery Capacity (mAh)

Load Current (mA)

Battery Life

Estimated Runtime

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Hours

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Days

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Formula: Life (hours) = Battery Capacity (mAh) / Load Current (mA) × 0.7
Factor 0.7 accounts for real-world battery efficiency.

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Battery Life Calculator is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.