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What is the difference between AH and RC ratings?

April 26, 2017ah difference ratings RC

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What is the difference between AH and RC ratings?

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Ampere-Hour (AH) Capacity rates a battery for a specified quantity of electricity, at a given rate, over a definite period of time. Reserve Capacity (RC) rates a battery with more specific criteria. It measures the time in minutes that a new battery will deliver 25 amperes at 80°F and maintain a terminal voltage of = or > 1.75 volts per cell…enough to find emergency help if the charging system fails.