Seriously? I just bought a new battery for my 2.16ghz Rev A MBP, and the max I get on my battery is 2:10 when I first unplug it. I've calibrated once, reset my SMC, and always have my screen on the first notch. BT is off. It's at 75% after 25 minutes of usage. Is this all I can expect? Apple advertises 4 hours and I know that;s never right, but half that? Really? I might as well buy a desktop if I can hardly use it in more than one class during the day.