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How long will a 12v 200ah battery last?

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How long will a 12v 200ah battery last?

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The 200AH battery can feed 200 Amps for 1 hour, or 100 Amps for 2 hours, or 10 amp for 20 hours. This isn't actually true, because if I remember correctly the rated capacity is only valid for 20 hour or greater discharge periods.

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