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The capacity of a battery is measured in two ways.

Cold Cranking Amps, is the maximum current output in cold temperatures, without damage to the plates.

Ampere-hours (or milliampere-hours), is the discharge rate that can be sustained for one hour. By convention, even though it is (milli)ampere-hours, it is normalized to an eight-hour rate. This means, for instance, if a battery is rated 800 mAH, it actually means the rating is 100 ma for eight hours. If a discharge rate higher (or lower) than that is encountered, then the hold-up time will be shorter (or longer) than the equivalent rate, by a factor that is dependent on the battery's design.

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