Reserve capacity is the number ofminutes a battery can maintain a useful voltage under a 25 ampere discharge. Thehigher the minute rating, the greater the battery's ability to run lights,pumps, inverters, and electronics for a longer period before recharging isnecessary. The 25 Amp. Reserve Capacity Rating is more realistic than Amp-Houror CCA as a measurement of capacity for deep cycle service. Batteries promotedon their high Cold Cranking Ratings are easy and inexpensive to build. Themarket is flooded with them, however their Reserve Capacity, Cycle Life (thenumber of discharges and charges the battery can deliver) and Service life arepoor. Reserve Capacity is difficult and costly to engineer into a battery andrequires higher quality cell materials.