Hey guys, I received my new MBP 13' yesterday, and when I fully charged the laptop after opening it from the FedEx package, the estimated battery life at 100% was 4~5 hours. Then, I calibrated the macbook, following the instruction given on the Apple website. Right now, it's charging. However, the time keeps on changing, but right now, it's at 43%, but when I take off the battery charger, it says my battery life remains 2 hours 40 minutes. That means the battery life will be around 5 hours when the charge is done! I thought the advertised battery life was 7 hours.. Is there something wrong with my MBP 13'? Please help! Thank you!