Rayovac®, RL123A-2, Photo Lithium Battery, Lithium-Manganese Dioxide Chemical System, 3 V DC Nominal, 1400 mAh Nominal, 123A Battery, 2 VDC Discharge Cut-Off, 100 Ohm Internal, Cap/Recessed Base Terminal, Plastic Case, 10 years Shelf Life, 0.669 in L x 0.669 in W x 1.358 in H Dimensions