They keep going, and going, and going.BatteryEnergizer BtUses:A 1.55 volt watch/electronic battery. Replaces A613, LR1154, EPX76, A76, LR44, SR44SW/W.(1) Keep away from small children. If swallowed, promptly see doctor. (2) Battery can explode or cause burns if disassembled, charged, or exposed to water, fire or high temperature. Keep in original package until ready to use and dispose of used battery promptly.