3S Zippy K 4300 cell

[Raze ST Truggy]

One of the cells on my zippy pack puffed on me and I was wondering if someone could give me a couple tips on taking the bad cell out of the pack. Or if I have any other options. the voltage hasn't dropped but the one cell is definatly puffed. Funny thing is that it happed while the pack was just sitting in a box on my dinning room table. thanks Is it worth trying to charge it/ discharge it a few times to try and get it to un-swell?

-Brian