I think the battery is probably a bad one, ask Apple if you can get a replacement battery. Just say it doesn't hold a charge, and they should give you another battery. They did for me. ![]()
This MacBook is about 5 months old but I have recently seen its battery life drop from an average of 5 hours per charge to a pretty indecent 3 hours.
Not sure what to do about this... even on minimal usage - Safari, Mail, MSFT Messenger - the laptop has lost 2 hours per charge. It is annoying and I am not using the maching more than before.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic