early (2008)mbp shuts down when battery goes lower than 76% charged

[weemanpow3]

My MacBook Pro shuts down instantly when the bettery level goes lower than 76%. It does this on my Windows and OSX side. any ideas?

 

[Eidorian]

I've heard of this happening before with bad batteries.

 

[bov]

your battery is probably defective, go to Apple and get it replaced!

 

[weemanpow3]

I will have to buy a battery because my warranty is out.

 

[Ryox]

This happened to me, I took it to the apple store and they told me it was a defective battery. They replaced it then and there and the problems been fixed ever since.