Duracell DL123AB2PK Specialty ULTRA Photo Battery Pack, Cylindrical, Nominal Voltage: 3 V, Nominal Capacity: 1500 MILAMP-HR, Discharge Cut-Off Voltage: 2.5 V At 1000 MILAMP, 15 HR, Maximum Discharge Current: 1000 MILAMP At 2.5 V, 15 HR, Lithium-Manganese Dioxide Electrolyte, Life Hour: 15 HR At 2.5