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RC (reserve capacity) is the number of minutes that a battery can support a 25 ampere load at 80°F until its terminal voltage drops to 1.75 volts per cell or 10.50 volts for a 12V battery. For example, a 12V battery that has a reserve capacity rating of 100 minutes, signifies that it can be discharged at 25 amps for 100 minutes at 80°F before its voltage drops to 10.50 volts.
