Hello guys. Ok got a quick question. I have a new macbook which I got back in late june. When I first got it I calibrated the battery and all that. Well last night I decided to calibrate it again. Before when I had the powe r cord plugged in it would charge to 100 percent. Now it only goes to 99 percent. However when I unplug the power cord the battery shows 100 percent. I plug the cord back in and its at 99 percent. What's going on????