Portable Computers: Models Which Do Not Have a Backup Battery

This document describes which portable Macintosh computers do not contain a backup battery and what this means.
This article has been archived and is no longer updated by Apple.
Portable Macintosh Computers without a Backup Battery
  • iBook (all models)
  • iBook G4 (all models)
  • PowerBook G4 (12-inch) (all models)

Changing a Battery in a Portable Without a Backup Battery

Because there is no backup battery in the portable computers listed in the section above, additional care should be taken ensure the AC adapter is plugged in.

Removing the Main System Battery without AC Power

When removing the main battery without the AC Adapter, the computer should be shut down since the contents of RAM are lost when no power is available. There is a small capacitor that maintains the system clock long enough to swap the main battery.

Published Date: Feb 20, 2012