New, premium brand backup battery for the original Macintosh 128K, 512K and Plus. This is an Exell PX21 4.5v alkaline battery used to store the date/time and other parameters when the power is removed from the Macintosh.
Also Known As: 1306AP, 3LR50, 523, 0000-00-000-0000, A21, A21PX, A133, APX21, BA-1098/U, EN133A, EPX21, PC133A, PX21, RPX21, V21PX
Specifications
Output Voltage: 4.5V
Amperage: 600mAh
Chemistry: Alkaline
Height: 49.9mm
Diameter: 16.8mm
Terminal Type: Flat Top
Country of Manufacture: U.S.A.