I just bought a 12" 900MHz combo. I've noticed that when in OS X my battery acts wierd. When the iBook is plugged in to the AC power sometimes the battery doesn't charge, like right now the battery level has been at 95% for about 4 hours now. It should be 100% now. But if I boot into OS 9 the battery level says it's full. Must be a bug in OS X. I'm running 10.2.6 it that matters.