Battery is Not recognized - Shows (X) out in Menu Bar

I have a White 13" Macbook. The battery is no longer working. It shows as X'ed out in the menu bar. When i plug in the Power cord it goes Green immediately. It does not charge the battery at all. The laptop runs fine off the Powercord but dies if i unplug it. I tested the power cord and battery on a similar macbook. So it seems that it would be the computer. I did try and replace the keyboard before this all when down but the battery was fine or a week or 2 before it went X'd out. Does this sound like it could be fixed by replacing the "Batter Connector" or a Logic Board issue? Reading the posts it sound like if the computer works then it would not be a logic board issue?

Any thoughts?

Thanks

Aaron