Hi, I have the iBook (the first «icebook» 10gig harddisk, 384megs). I have always System 9 (9.2.1). I never keep OS X because I use Word and the battery life was not good for me. But now, few years later, the last OS X is it different about the life of the battery or it is better that I stick with System 9.2.1? Thank's Daniel