4 Replies Latest reply: Nov 6, 2010 10:05 AM by Fastfission
Fastfission Level 1 Level 1 (35 points)
I've had my iBook G4 for about two years now, with the same battery that came with it initially. I know that batteries lose their ability to hold a charge over time, of course. But in my case it seems a little odd. It charges up to 100% just fine -- no problems there. But starting about a week ago, when it gets to about 40%, it completely runs out of charge and just shuts down. Pressing the little "status button" on the battery itself shows no charge at all. If I then plug it back in again, it will start up and run and charge as normal, still starting from 40%.

Accordingto coconutBattery the battery itself only has 51% of its original capacity available, but even then, shouldn't it have re-calibrated the battery itself so that I don't get down to 40% and then lose my work? I don't get any "low battery" warning messages like I used to -- it just shuts down.

If I only have 40% of a 51% capacity, then I really have a battery with only 20% of its original capacity. I've tried to recalibrate according to the instructions on the Apple website (charge it up, let it power down, charge it up again) but it doesn't change anything, likely because it never gets any closer to being officially empty than 40%.

Should I just admit battery defeat and buy a new one, or could it be something else that is the matter?

iBook G4   Mac OS X (10.4.6)