Replacement battery for Medical. Specifications: 800mAh, 3.6V, Nickel Cadmium (NICD). Compatible with: Medical. Replaces: 11720, 11730, 18100, 18200, 1919-P-5020 MEDIC LUX, 199121 and 38 more. Alpha Source replacement battery designed for Medical devices. A precise, secure fit you can rely on.