To start the rebuild/repair, pull off the wrapper from the pack. It should come off in one piece. Save it for replacement after the repair.
There are two clips holding the terminal end on the pack, pry them up (Not to hard, you need this piece intact.) I had to use a small flat blade for this step.
Pull the terminals and batteries out. Clip the wires as close to the terminals as possible. I had four packs and only two good batteries. In this case I removed only the bad cell from one and a good cell from another to take its place.