No battery detected but computer runs on the battery!

There is an X on the battery icon. When I check the power info, it states that there is no battery installed. However, when I unplug the power cord, the laptop obviously runs off the battery. I did remove the battery and leave it out a few minutes and then put it back in. No change in the icon.
Why is the battery not being detected but it is obviously charged and able to be used? Any ideas? My MacBook Pro is about 3 years old.

The battery is rarely ever used on this laptop. It sits on the desk and is only used there so I doubt the battery has gone through many cycles at all.
That is a big clue. More batteries in MBPs have problems from lack of use than nearly daily use. Please see this Apple article:
http://www.apple.com/batteries/notebooks.html
noting the section:
For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her MacBook Pro on the train, then plugs it in at the office to charge. This keeps the battery juices flowing.
Also review this excellent user tip:
http://discussions.apple.com/thread.jspa?threadID=1764220
At this point, you can help people help you by posting your battery stats. Do "About this Mac..." then click "More info..." This launches System Profiler, or "SP." In the left-hand pane, single-click "Poweer" and a bunch of power-related info shows up in teh main pane. Under "Battery Information are a number of things. Copy and everything in that section EXCEPT the battery serial number and paste into a reply to your own post. Then people can give you an idea of how to proceed, as that info pretty much tells all about the condition of the battery.

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Attachments:
Attractive Force XML.vi ‏23 KB

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