my macbook's power adapter was doing this last night. as well, the battery meter was going from 100% to 99% back and forth. eventually it stopped and just stuck on green. now i have unplugged it and it's at 81% charge but when i plug the magsafe in, the light stays green. what's the deal? already reset my PMU. afraid to calibrate because the charger does not appear to actually be charging the battery. anyone had this happen?