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Battery Runtime Calculator

Battery Runtime

Disclaimer
T = DoD x C x (C/H)^(k-1) / I^k Peukert's Law - chemistry presets applied automatically.
Override via Advanced Parameters.

Battery

V (Volts)
Not used when load is entered in Amps - switch to Watts to use this field.

Load

W (Watts)
% DoD
k value
hours

These values are pre-filled based on your selected chemistry. Edit them to match your specific battery datasheet if needed. Peukert k must be between 1.00 and 2.00. DoD must be between 1 and 100.

°F
Enter a temperature in °F

These factors are applied as a multiplier to the estimated runtime. Temperature and age can significantly reduce usable capacity. Condition accounts for general degradation from use or storage. Actual results vary by chemistry and maintenance history.

⚠ This is a primary (non-rechargeable) battery. It cannot be recharged once depleted.
⚠ High discharge rate detected. Real-world runtime may be significantly lower than calculated. Verify your battery supports this discharge rate.

Runtime estimates are based on typical battery characteristics and operating conditions. Actual runtime may vary due to battery age, temperature, discharge rate, manufacturer specifications, and state of charge.

The Peukert's Law Battery Runtime Calculator estimates battery runtime by incorporating the effect that discharge current has on available battery capacity. Unlike simple amp-hour calculations, Peukert's Law recognizes that battery capacity may vary depending on the discharge rate, particularly for lead-acid batteries and other chemistries with non-linear discharge characteristics.

This mobile friendly battery calculator supports common battery chemistry presets and also allows custom values to be entered from published specifications or manufacturer data. Additional adjustment factors are available for temperature and battery age. Results are calculated from the values provided by the user and represent estimates rather than measured performance.

Battery runtime can vary due to numerous factors, including discharge rate, operating temperature, battery condition, charging history, age, manufacturing differences, and load characteristics. This calculator is provided for informational and reference purposes only and should not be considered a substitute for manufacturer data, testing, or engineering analysis.

This tool is provided for informational and convenience purposes only. While reasonable efforts have been made to provide accurate and standards-compliant output, no representations or warranties are expressed or implied, and the operator of this site assumes no responsibility or liability for errors, omissions, or any damages arising from the use of this tool or reliance upon the results it produces.

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