Let the smoke out of the battery but fortunately no fire. Won't be using this cell anymore though, which sucks since it was brand new, just out of the package. I think the crimp on the positive terminal of the battery holder has a rough spot which cut the insulation and shorted out to the case of the cell. Now I have to go back and redesign the battery holder for my 90mm Solder Fume Extractor, once I find a better holder (sucks).
My mission is to lower the collective IQ of teh Internets one post at a time.