..from: http://docs.info.apple.com/article.html?artnum=120281
The Battery Update supports the following products:
* iBook (Dual USB) * iBook (Late 2001) * iBook (Opaque 16 VRAM) * iBook (32 VRAM) * iBook (800 MHZ 32 VRAM) * iBook (900 MHZ 32 VRAM) * iBook G4 (12-inch) * PowerBook G4 (12-inch) * PowerBook G4 (12-inch DVI) * PowerBook G4 (15-inch FW 800) * PowerBook G4 (17-inch) * PowerBook G4 (17-inch 1.33GHz)
About the Battery Update
The Battery Update enhances the performance of the battery to ensure that full capacity is available for your PowerBook or iBook.
How To Install
1. Download the Battery Update.dmg
2. Open the BatteryUpdateManual.dmg
3. Double Click the BatteryUpdate.pkg
4. Follow the onscreen instructions. A status bar shows the progress of the update
Note: If a message says the "This Software is not necessary for your computer," then you do not need the update.
5. When a message says that the Battery Update has been successfully installed, click the Restart button.
Note: Once the Battery Update software has been installed, each battery you install in your PowerBook or iBook will be updated automatically.