Brand new lithium 3.6v 1/2 AA PRAM battery for desktop Macs. See compatibility table below. Symptom of a dead PRAM battery vary but typically cause certain settings such as date & time to be lost every time the computer is turned off or disconnected from the mains. Some Macintosh models exhibit more serious symptoms including the LC range which may appear completely dead as a flat PRAM battery prevents the logic board from starting up. In the LC475 it can prevent video out initialising.

Compatibility Table
• Macintosh II series computers
• Macintosh SE FDHD
• Macintosh Classic (4-chip and 2-chip)
• Macintosh SE/30, IIx, IIcx, IIci, IIfx, IIsi series computers
• Macintosh IIvi, IIvx, Performa 600 series computers
• Macintosh LC, LC II, LC III, Performa 400 series computers
• Macintosh Quadra 605, LC 475, Performa 475, 477 series computers
• Macintosh LC 520, LC 550, Performa 550 series computers
• Macintosh Classic II, Color Classic, Performa 200 series computers
• Macintosh Centris 610, 650, 660AV series computers
• Macintosh Quadra 610, 660AV, 650, 700, 800, 840AV, 900, 950 series computers
• Power Macintosh 6100, 7100, 8100 series computers, and Performa 6100 series computers
• Power Macintosh 7200, 7300, 7500, 7600, 8500, 8600, 9500, and 9600 series computers
• Power Macintosh G3 - all models, entire series
• iMac - all models, entire series
• eMac - all models, entire series
• Power Mac G4 - all models, entire series
• Power Mac G5 - all models, entire series