I have now had my new MBP for a week and the battery health last week was 97, now its 94 (8103mAh), and seems to keep going down! What am i doing wrong? I am only using the machine on battery. I charge it all the way up and then use it all the way down, normally in one go. I haven't calibrated the battery yet, will this make a difference? is the way that i am using the battery damaging?