I have been using my 17AluPB for the past several days and I love it. For basic internet surfing and word processing, I am getting about 2.5 or 3 hours on my Powerbook. Now this is not bad considering how big the screen is but the Apple ad suggests that the battery is good for 4.5 hours. Any feedback on other 17PB users is welcome. Suggestions on how to save energy? BTW.. for gamers this machine is INCREDIBLE!! I'm very happy with this computer so far.