Battery charge info in status bar is incorrect!  HELP!

This issue started a day or two ago and at first I thought it was no big deal, but it's actually quite a problem! I've got a 15.4" Macbook Pro that I bought in May, and have never had any problems up until this point. But then I noticed that the icon in the status bar where it says the percentage of battery charge and says whether it's running off battery or it's plugged in - it's WRONG. It's stuck at 99% and says it's plugged in. All the time. Even when it's almost dead and not plugged in. So I can't tell how much battery charge it has left. In all of the places where you can view info about the battery, the info is wrong - it says it's fully charged, that I have a long time left, etc. but it's not true. So now it can completely out of batteries and shut down and I won't be able to tell that it's running low.
Has anyone had this problem? What do I do? Is this a software or a hardware issue? HELP!

Have you tried resetting the PRAM ?
http://docs.info.apple.com/article.html?artnum=14449

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