Reserve Capacity, RC
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The reserve capacity, RC, is measured in minutes and is, according to the SAE norm, the time taken to discharge a fully charged battery at 25 A to a voltage of 10.5 V at a temperature of +25°C (+77°F). The reserve capacity is the length of time the battery is able to supply necessary components with current when the generator (GEN) in the car is not functioning. Volvo batteries are marked with the RC value according to the SAE norm.