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How do you calculate battery watt hours?

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How do you calculate battery watt hours?

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An amp-hour is one amp for one hour, or 10 amps for 1/10 of an hour and so forth. It is amps X hours. If you have something that pulls 20 amps, and you use it for 20 minutes, then the amp-hours used would be 20 (amps) X . 333 (hours), or 6.67 AH.

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