As you can see, I've had my MBA about a year and have logged 49 charge cycles. About a week ago, I noticed my battery draining more quickly than usual. The capacity has dropped from 96 to 90% (actually it's down to 88 now...) in a very short time. I know this can be normal, but it also coincides with poorer real-life battery performance. The only variables in this time period are Mavs and a new charger that replaced a failing original. Could either one of those things be responsible? <90% capacity on an MBA with <50 cycles worries me a a bit.