I didn't have any problems with my MBP 15" untill i did that battery update. I'm not imagining this. I'm very observant with my MBP, just like many of you. After doing the update just yesterday, the battery runs out more quickly. It is much hotter on the bottom (so much that my legs feel lightly sunburned). Fan runs almost all the time now! This is all new, and it never go this way. Funny thing is, i wasn't doing anything on my computer at all but watching movies with itunes. I've played quake 4, with teamspeak on, and itunes on ect. and it never ever got this hot before. I should contact apple, but there closed now. Is there a way to undo this firmware update? Did anyone have this problem?