Computer goes to sleep when unplugged and won't charge...

I've only had my laptop for a year and change, and all of a sudden this evening something weird started happening. It says the battery is completely dead even though I keep it on the charger. Last night I shut it down for the first time in a few weeks (I have a nasty habit of just putting it to sleep instead of shutting it down properly). Now, this evening, if I let it go to sleep on its own (from inactivity) it refuses to wake up no matter what I do, and if I try forcing it to cut off (by holding down the power button), it will not turn back on until I attach the power cord. If I unplug it, no matter how long it's been charging, it will automatically go to sleep, and the battery recharging "restarts" from zero.
Why is this happening and what do I need to do to fix it? Please help!

A good place to post your issue is in the Macbook>Power & Batteries forum area here:
http://discussions.apple.com/forum.jspa?forumID=1169

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