I got my MBP when they were updated in June. Recently, the battery life has been extremely low. On a full charge, I get less than an hour and a half. According to Coconut, my health is at 37%. Obviously, that's not good. I calibrated it a few days ago to see if that would fix things, and it didn't. The only thing that comes to mind that might be causing this is that at least once a day I unplug it and take it to class. Could this be hard on the battery? Or do I just have a faulty battery? Thanks for any advice.