Hi, I've bought myself a new MBA 2013 just two weeks ago (I sold the old one to my friend, and bought a new one (didn't buy 2014 'cause 2013 was very cheap.) According to coconut battery, battery capacity was 7300mAh two weeks ago, but now it shows only 7180. Its battery capacity is supposed to be 7150mAh but if the capacity goes down 120mAh in two weeks it won't last long. I'm charging it once a day, and unplugging it when the battery is full. I did not calibrate it when I bought it, assuming it was already calibrated. Is it a faulty battery or is it normal? It goes 12 to 16 hours with a single charge, indeed it was when it's new. It has only 11 load cycles.