I've had my Macbook since December of 2006 and have to admit that with over 744 charge cycles later the battery is doing better than i expected. With full brightness on and just surfing the web, the battery will last a good 2 hours or more, depending on what i'm doing. If it's just videos, like Hulu then the battery will last less than an hour. But I read somewhere, I think on these forums but can't find it again...that if I still have AppleCare I can ask for them to replace this old battery with a new one at no cost. I only ask cause i'm on the road a lot and hate it when my Mac is close to dying and i'm on a roll writing an essay or something important.