I have had my Pbook for a few weeks now, (15" 1.67G4, 80 gig, 1 gig ram, 128 video) and I have never had a problem with the battery life, in fact, i'm pretty impressed. But I am usually using it on battery for just typing in Word. I have never done anything that uses graphics or video. I am getting ready to take a long bus ride, and wondering how well the battery holds up to watching movies. I figure it should last a while if I turn off the airport and such.