When I acquired this mid-2014 ex-Apple executive MBA, its battery was at 87% of its original capacity. I've been using a $15 app called FruitJuice to monitor & correct my battery usage. Today's target is 1 hr & 51 minutes on battery (34 minutes use so far) to keep the battery in its best condition. After using the app for about 6 weeks, the battery has reached 92%.