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June 18, 2024

Battery run-time calculator

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We have a whole web page tutorial explaining the method and theory of calculating how much battery capacity you need. That page teaches how to take into account battery lifetime, Peukart effect, and end-of-life matters.

This page is a quick run-time calculator to help you estimate the run-time based on simple assumptions. Note that there are battery run-time calculators on the web that are very wrong.

Enter your capacity Amp-Hours and your discharge in Amps in the form below and press the "Compute" button

Capacity (Amp-hours)
Discharge rate (Amps)
Run Time (hours)

Scientific notation can be used ( 0.0045 = 4.5e-3 )

This calculator gives a good estimate for Lithium Ion, Lithium Polymer, NiCad, and NiMH batteries. Not so good for alkaline, carbon zinc, lead acid, lithium thionyl chloride, and coin cells. Without making you read the tutorial referenced above, some batteries have a big change in capacity based on how fast you discharge them. The "comments" gives recommendations for lead acid and sealed lead acid batteries. When the discharge gets too extreme, all you can do is go to the battery's discharge curves in the data sheet.

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