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How long will a 400 mAH battery last?

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The same battery on a full charge, will last 4 hours if 1000 mA (1 A) is being drawn. It will last just 1 hour if you draw 4000 mA of current from it. If you talk about smartphones, they typically draw 400\u2013500 mA current (avg.) when being moderately used.

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