Hi guys, I just bought a used MBA 2011. Great, except concerning the battery, which gets depleted really fast. I ran Coconut battery in order to check its state, and it says that the battery is in good shape. This is strange. Any idea ? Here is a picture so that you can see what I mean... It says "3:39 left" on the top, with 91 % of the charge. Yet the battery's health is great.