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Calculating Battery LifeYou should do your own homework, but I'll give you part of the answer to get you started, and you can do your own math.

Divide the Amp-hour capacity of the battery [22] by the current draw in Amps [65 mA = 0.065 Amps]. That will give you the number of hours the battery will last. If you want to convert that to days, divide again by 24 [the number of hour in day].

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Q: How long will a 22 Ah battery last with a 65 mA parasitic drain?
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