WHAT IS RESERVE CAPACITY?

Reserve capacity is the time in minutes that a new, fully charged battery will deliver 25 amperes at 27 degrees C and maintain a terminal voltage equal to, or greater than, 1.75 volts per cell. This rating represents the time it will continue to operate essential accessories if the alternator or generator of a vehicle fails. In other terms, it is a battery’s ability to sustain a minimum vehicle electrical load in the event of a charging system failure. Under the worst conditions (winter driving at night), low beam head lamps, windshield wipers, and defroster while driving at low speeds.