Full Battery charge lasts 10-15 minutes.

Hi,
Macbook says it is "charged" but when I unplug the adapter it runs for about 10-15 minutes then turns off and the battery level goes back to one light (low level) so then I have to recharge for over an hour for a full charge and the same thing happens again. I've seen other post about doing a "full-cycle" charge and resetting one thing or another but I'm not clear what all that entails so any help addressing this issue would be appreciated. thanks.
Peyman
Message was edited by: Pey

Have you tried calibrating the battery?
http://support.apple.com/kb/HT1490

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