I took my rMB in to the Genius Bar and they ran a test on it and it came back the battery is not function properly. The Genius said the specs are after a 1000 charges the battery would be 80% not 81% after 34 charges like mine. So they are replacing my battery. What's strange is two weeks ago it was 98% after 26 charges. In 14 days it went from 98%-81%.