Macbook shuts down unexpectedly when battery reaches 20% and unplugged

I noticed this behavior after installing the Bonjour Update 2010-001 (version 1.0) and the Remote desktop client update (version 3.3.2) last night. Upon reaching 20% of battery capacity, the macbook shuts down, and will not restart until it is plugged in. There is no warning, it just turns off.
Does anyone know what's going on?
Message was edited by: incomethax

Wow! I recently had this same EXACT problem and called Apple Care about it last week and said that they cannot do anything about it since my battery cycle is too high ( only 315) ! MacBook is the same model as yours. I finally brought mine in today at a local genius bar (Otay Ranch) and they replaced the battery even though My Mac's just a little over a month its 1 year warranty. I will now calibrate this battery and see if the same problem persists. When I called about this problem, the Apple Care rep says that he has never seen this problem before but now I just saw this and glad that I wasn't the only one, maybe its a faulty design on the first generation Unibody with removable batteries (Late 2008)

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Macbook shuts down unexpectedly when battery reaches 20% and unplugged

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