macbook battery trouble pls help

[andrewface]

my macbook battery is going funky on me...once i get to about 50% charge when running off the battery the macbook shuts down completely...when i plug in the power chord it boots up and the battery is at 0% and it begins charging again...anyone have an experience like this...any suggestions...i couldnt find anything on apple.com and I dont have apple care...thanks

edit: UPDATE: very weird i just unplugged the power chord as it was charging (said 22%) and then plugged it back in and it has jumped to 58%. Very weird...is something wrong with half of the battery..is there someway to reset it or something?
thanks

 

[motownflip]

try doing this: http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh2339.html
Hopefully this helps.

 

[Snow Flow]

sounds like the problem I had. Try it again, charge it, unplug it, and see if it shuts down at 50 again. I called apple and they said my battery was crap, though it wasn't part of the 2 recalls. They sent me a new battery, and now its all good.