Apple notebook owners are being offered a software update for their batteries, which enhances performance.
Apple's Battery Update software is a 160K download, available here.
It requires Mac OS X 10.2 or later, and: "Enhances the performance of the battery to ensure that full capacity is available for your PowerBook or iBook," Apple says.
The update is compatible with the following notebooks from Apple:
iBooks: Dual USB; Late 2001; Opaque 16MB VRAM; 32MB VRAM; 800MHz 32MB VRAM; 900MHZ 32MB VRAM; iBook G4 12-inch.
PowerBooks: G4 12-inch; G4 12-inch DVI; G4 15-inch FireWire 800; G4 17-inch; G4 17-inch 1.33GHz.