Eveready EL123AP Energizer Lithium Battery Pack, Nominal Voltage: 3 V, 1500 MILAMP-HR Rated At 100 OHM, Discharge Cut-Off Voltage: 2 V At 21 DEG C, Maximum Discharge Current: 1500 MILAMP Continuous, 3500 MILAMP Pulse, Electrolyte: Lithium/Manganese Dioxide (Li/MnO2), Positive Terminal: Nub, Negative