Having Some MAJOR Battery Issues....(HELP)

So, I just woke up, and I noticed the Battery Status Icon in my menu bar had an X in it and said "No Battery Available."

Um, No.
So I popped out the battery, rebooted, and now it shows a battery, but it says 0%. And the kicker is...

It's not charging.

Ok, first off - my Powerbook has been plugged in all the time, hasn't been on battery at all. So why did the battery drain while it was plugged in?

And second, why won't it recharge? Wtf is up with this crap?

I have the older Powerbook G4 Titanium 15" if that matters. And I don't want to spend 129 bucks on a new battery. Cause that is ridiculous.

Thanks for any ideas or help.

 

its been used a good amount.

in fact my gf was using my PB on my bed just like 2 nights ago, and when i plugged it back in it charged up.

it got used alot while i was at school, not so much since i've been home (june) but still, its not like it never ever used it.