...from: https://depot.info.apple.com/batteryexchange/index.html

15-inch PowerBook G4 Battery Exchange Program

In cooperation with the U.S. Consumer Product Safety Commission (CPSC) and other international safety authorities, Apple is voluntarily recalling certain lithium ion rechargeable batteries that were sold worldwide from January 2004 through August 2004 for use with 15-inch PowerBook G4 (Aluminum) notebook computers. These batteries were manufactured by LG Chem, Ltd. of South Korea.