I've had my Macbook Pro for a little over a year now. I am very careful to not have it plugged in all day, in fact I take it to work and make sure it gets down to around 30 or so percent before plugging it in to charge it up. I also do full power battery cycles at least once a month (sometimes twice). At a little over a year and 215 "cycles", I am now at 92% battery health. It's a little disconcerting that i've been so careful about draining the battery and completing full battery cycles that my battery is down almost 10% health already. Is this normal? Am I doing something wrong which is killing my battery more than it should?