3.6V PRAM Battery
For Select Desktop Systems.

Is your computer forgetting what time and day it is?

Macintosh computers contain an internal backup battery to maintain system settings, such as the date and time, when the computer is turned off . The battery may last up to five years though actual life is determined by shelf life of the battery and usage patterns of the computer. The batteries used in the Macintosh computers listed below are lithium, and are 3.6 V

When the computer does not retain PRAM settings (such as the date and time) after it has been turned off, this generally indicates a dead battery. Some Macintosh models, such as the Power Macintosh 7100 and the Quadra 605, display a black screen when the battery has failed and the computer is turned on.

Classic Macintosh Models

• Macintosh II series
• Macintosh SE FDHD
• Macintosh Classic (4-chip and 2-chip)
• Macintosh SE/30, IIx, IIcx, IIci, IIfx, IIsi series
• Macintosh IIvi, IIvx
• Performa 600 series
• Macintosh LC, LC II, LC III,
  
• Performa 400 series
• Macintosh Quadra 605, LC 475,
  
• Performa 475, 477 series
• Macintosh LC 520, LC 550
• Performa 550 series
• Macintosh Classic II, Color Classic
• Performa 200 series
• Macintosh Centris 610, 650 660AV series
• Macintosh Quadra 610, 660AV, 650, 700, 800, 840AV, 900, 950 series

Power Macintosh Models

• Power Macintosh 6100, 7100, 8100 series
• Performa 6100 series
• Power Macintosh 7200, 7300, 7500, 7600, 8500, 8600, 9500, & 9600 series.
• Power Macintosh G3 - all models, entire series
• Power Mac G4 - all models, entire series
• Power Mac G5 - all models with PCI slots. NOT for the PCI-Express based Power Macintosh G5 2.0, 2.3 or dual 2.5.

Additional Models

• eMac - all models, entire series
• iMac - G3 and G4 Models