I've seen it say after a full charge that it will last around 4.5 hours. but just now when i fully charged it and took the cord out..it said it only has 2 hours?! all i have running on it is safari. i checked for other programs running, but nothing. my computer is only 3 months old. surely the battery can't be getting stuffed already? i always fully charge it, then let it run down again, then fully charge it. sometimes tho i have left the charger in while its already charged up. could that be the problem? ps i did search the forums for a similar subject but couldn't find anything. http://www.apple.com/batteries/notebooks.html i have been reading this..but yeh. Nevermind.. its all of a sudden gone back up to 4 hours. it's so weird.