First boot up of my 13" MBP showed a 5:15 battery life. After calibrating the battery, I saw 4:02, and then a second later it dropped to 99% and I got 3:37. My brightness was at half, Safari was the only app open, just sitting plainly on Apple.com. Bluetooth was off. Wifi was on. Backlit keyboard was off. Now my battery health (iStat Pro) indicates my battery health is at 99%. After a few hours! Is something wrong with the MBP or is this just a software glitch after calibrating?