Losing power when taken off the chord...

My MacBook turns completely off every time I take it off the power cord. Once I plug it back in, it easily come back on. Is this a battery issue? I am unsure of where to even start troubleshooting. Help!

Have you done the update.
http://www.apple.com/support/macbook_macbookpro/batteryupdate/
Try the solutions and if that doesn't work contact the apple number in the update.
Mort

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