I just calibrated my air using Apple's instructions here: http://support.apple.com/kb/HT1490 Previously my full charge capacity showed 4520mah, but after calibration it's showing 4375mah! What caused the drop? Should I be concerned? I thought that calibrating the battery would increase the full charge capacity. FYI: I've had about 30 cycles on the battery so far (in about 2 months I think)..