I've had this problem for about 1.5 years now, and I've learned to ignore it! Hell, it's doing it now! 100% and orange w/the "bolt" symbol. I have tried to recal the battery, reset the PMU and do a voodoo chant with no favorable result. And AppleCare, right! "Battery is a Consumable"!! I've just chalked it up to another quirk that all computers have to some degree or another.
But if you find out anything that solves it, save getting a new battery, PLEASE post it!! Of cource, I've wondered if it also could be a flakey power adapter. Oh, well. Good luck!