same issue on a 2007 macbook pro. took it to local apple store (pacific centre - vancouver) and was told that "it is normal that the battery swells, potential breaks other stuff in the process & gets jammed in the laptop". Total BS. Had previous good experience with apple and store but this one definately a case of apple being evil.
Calling applecare to see where that goes and also just ordered a replacement from battdepot ($57 CAD all in with 1 year guarantee). $129 for a battery? No thanks Apple.
I've given up on this for now. While I don't need to take my MacBook out so much I'll just run it on mains. Maybe eventually I'll buy a 3rd-party replacement. I don't want to spend too much as I hope to get a new Mac in the not too distant future -- although with Apple's obsession with the iPhone and iPad I'm a little concerned about their long term plans for the Mac. Still, that's another discussion.
I have ordered a 'fake' battery on amazon for £22. It arrived already SWOLLEN!
have ofcourse returned it and was duely reimbursed.i have since heard nasty things about these cheap chinese fakes and as i refuse to fork out over £100 for the original, for the moment i am connected to mains only.
Still, this does not exepmt Apple from responsibility and being well aware of the problem, Apple should offer a replacement battery for a reasonable price (around £30 i reckon)