They are a new pack, and I have a pretty solid 4-step right now that doesn't heat anything else.

I matched these cells myself. It is only a 4-cell pack, but they are all from different battery packs that I purchased. They were all over 1.215 and 505s, IB cells. Anyway, I am bummed about that cell. I am gonna try to revive it, but I ain't keeping my hopes up. It peaked much too early.