Battery shows "calculating" with green ring

Greetings,
A few days ago my 1.5 year old battery on my PowerBook G4 was working just fine, holding a charge for several hours. Then I let the sleep drain the battery. Now all I get is the battery showing no green LED's, Calculating charge, and a Green ring on the charger. Same with my iBook charger. Any suggestions?

Just want to give Apple a 5 Star rating. I called Apple Customer Support and spoke with the representative who recommended I make an appointment at a Apple Store. He made the appointment after asking me a few questions.
At the store I had to wait for my turn about 20 minutes but the Tech checked out my PowerBook G4 and gave me a NEW BATTERY - NO Charge. Needless to say my next Computer WILL be and Apple.

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