My Biology class was 1.5 hours and I had less than 20% on my new MBP to type notes in a class where the teacher tests on what she says and talks very quickly. The MBP said 20% = 2 hours w/o wi-fi. I couldn't believe it, and I can lift it with 2 fingers, it's the perfect college laptop (besides a netbook, which isn't all that powerful)! Do you guys think that the battery is definitely a big selling point of the MBP? That was one of the biggest reasons I bought it and it's serving its purpose!