Well I'm just about to do it, just about to order a new battery for my 18 month old iBook G4, why? you ask, well it seems I haven't been as careful as I should've been with my iBook's battery. Because now, my Battery has just under a third of it's battery capacity from a full charge i.e. < 2 hours, rather than the 6 I used to get. I'm using it for a further 5 months, and then giving it to my parents, as I intend (after changing my mind several times ) to get a PB, and I can't give them a crippled battery. I know this has been asked before, but several solutions have been given for the same questions, so basically: -What do I need to do when I first get it. Charge 100% then Discharge to Sleep. OR Charge 100% then Discharge to Sleep then boot up Single User Mode to completely drain battery. -In the first week are there any particular cycles/calibrations that I should do after the initial one (above)? I've heard a couple of full discharge cycles in the first week are good. -What % should I let my iBook drop to before I really should charge it? I like sitting on the couch using it wirelessly, but most times I can just charge it whenever. -Is a monthly discharge to sleep really necessary for good battery life, or just the battery meter? Thanks!