Originally Posted by Duster_360

The cell that puffed is prob a weak cell and is struggling under the amps your ride is pulling. If its the puffed cell is returning to normal, its right on the edge of going bad. Ck voltage with dvm and then again early in a run. You'll prob see its dropped relative to other cells.

I'm guessing MA is not going to do anything for you except offer to sell you another.