Big problem with macbook battery: keeps disconnecting

Here's what i posted on another mac forum i go on. i noticed some people with the same problem on here but thought i'd post as they aren't all exactly the same:
just to fill you in first, i have a dec 07 2.2Ghz macbook which is totally stock and i have applecare
i noticed this last nite, suddenly my screen went off. i was confused and pressed a key on the keyboard and it came back up, thn went back off again. it did this a few times, until i noticed the battery icon had a little 'x' in it. when i plugged in the power supply it stopped doing it, but when i disconnected the power it did it again. i turned it off, removed the battery, put it back in and carried on as normal for a few hours, then went to bed.
i get up this mornin and start surfing the net and 10 minutes in it disconnects again :s i scrolled over the battery with the 'x' in it this time and it says something like 'no battery available'. now the strange this is i've been writing this for about 5 mins and it keeps coming up with the battery not available, but seems to stay on :s
anyone know what this could be? warped battery or something?
i was planning on ringing apple up sometime anyway, as i discovered a massive heat crack the other day so will probably give them a ring in the next couple of days when i get the chance.
thanks for any help

I have just joined this forum to research this very issue. In the past 2-3 days I have encountered the same problem with my 2 gig macbook (purchased feb. 2007. It will not function with battery only, even though all 4 test LED's are green. Just before it stopped functioning on battery I noticed an 87% charge indication.
In the previous 2 weeks I have also encountered an intermittent wireless internet connectivity, which is now to the point that it is just easier to plug in to the net to get reliable coverage, and even that can be slow.
First things first, is there any easy solution to the power issue?

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