This showed up in software update today: 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. System Requirements Installation of the Battery Update requires Mac OS X 10.2 or later. The Battery Update supports the following products: iBook (Dual USB) iBook (Late 2001) iBook (Opaque 16 VRAM) iBook (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) Note: Once the Battery Update software has been installed, each battery you install in your PowerBook or iBook will be updated automatically. © Apple Computer, Inc. All rights reserved. Apple, the Apple logo, iBook, and PowerBook are trademarks of Apple Computer, Inc., registered in the U.S. and other countries. Any thoughts? Should I re-calibrate my battery after installing the update?