In the first year or two of having my powerbook, the battery life seemed to decline until it would say that I only had about 20 minutes or so off of a full charge. This seemed reasonable enough, but recently I decided to ignore the low power warning and continue using the computer. Low and behold, I got about another hour of battery life (the indicator basically said it was empty). I thought maybe I just had to calibrate the battery, so I let it drain, and eventually the computer just turned right off (didnt goto sleep). When I charged it again, nothing had changed.. it was still exhibiting the same problems. So then I tried resetting the PMU, which also did nothing. I'm not exactly sure where to go from here... I've heard it might be the logic board, but this isnt under waranty, and it wouldnt be practical to fix it if that was the problem. Here's hoping.