I have had my MPB for 3 months, and have been careful to calibrate the battery, keep an eye on things, etc. Lately it's been hovering around 85% health (which seemed low to me, but it still had a 3 hour charge, so I was good). Anyway, I've had two or three kernel panics this months, which has troubled me. Then today, I unplug my laptop after charging it for an hour or so -- and after 10 minutes, without warning, the thing dies. I didn't think it was the battery, so I try and turn it back on -- I hear the Mac OS X startup noise, HD sputtering, and then nothing. Tried it a few more times before it refused to come to life at all. I plugged it in and it works but then I unplug it and the thing dies. The charge-o-meter says "No batteries available." I checked out the system profiler, and it says there is no battery installed. So -- is this a MPB issue or a battery issue?