Another new issue with my Blackbook. Several times in the last week it's decided to shut itself off when I had about 29% battery. Highly annoying for a fella like me who lives on a sailboat with limited power in the first place. When it happens, the battery indicator light on the batt itself blinks rapidly (0% charge). Sometimes when I plug it back in to power and let it sit a minute or two, it turns back on saying I have 30% battery. Yes, I reset the PMU already.