Hey guys. I got my first mac, my 13'' MBP 2 days ago and I've calibrated the battery overnight - PA until 100% and 2 hours more aprox., then have it on using the battery until it goes to the "empty" reserve battery. When I woke up it was on that reserve. I put the power adapter until full, waited 10 minutes afterwards, and now it is giving me some VERY weird readings: I've gotten 10h54min, and it is unstable. Now that I'm writing it is giving me 11:13. How is this possible? Should I re-calibrate it? It is altering from 11:33 to 7 hours something. I smell weirdness.