Apple Site says that the battery lasts 5 hours. My battery lasts around 3-3h30. This is when the brightness and volume is at 50 % and I am just watching a film or surfing the web. What about the rest of you, Alu Macbook owners, what kinda of battery life do you have.. P.S. I have calibrated the battery and I use it correctly. Also I have checked and my battery is not faulty.