I've had that happen to me once. It scared the hell out of me because i though it was a burn-in. However I think the real issue with battery is a software issue. Try this, let your battery run down to about 30 or less percent. Do a soft reset and you'll probably notice a 10 to 20 percent increase.
I use to do this with my T-Mobile MDA and XDA and I'd get about 5 to 10 percent increase in batt stregth after a soft reset but never this much.
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