https://support.apple.com/macbookpro15/batteryexchange/index.html Just saw this on TUAW and my mbp battery is in the program. I've had no issues but a free new battery is a free new battery. Check yours out!
I heard about this one when they showed it, and I'd reccomend that everyone does what they say! Somebodies PB G4 had a 6 foot flame shoot up when they came back from the kitchen!
Its not due to a safety issue its down to performance I think, well thats what they say in the article. They normally say don't use the battery if its down to safety, but they've not in this case they've said the oppposite.