I just cut off the heat shrink if it has any, remove tape that is holding the multi-cells togehter.
Then take a strong solder iron, and detach the cell, and balance wires from the main pack.
many of the cells are double sided taped to the next, so you need to run something between them that will not pull the covering of the cells away from the main cell body.
The cell looks to be covered in a thick aluminum foil like covering.
I took a plastic putty knife, and ran between the cells as I pulled.
Then there are pieces of thick silicone type rubber that keep the tabs of the cells from touching each other.
you will need to remove them, and reinstall them as you reconfigure them.
You will need to reinstall your main battery wires, and properly reinstall in the correct order you balance wires.
You will need some tape to hold the cells, and silicone tabs back in place,
and if you have it a piece of heat shrink to cover the battery.
If it was in a hard case, you will need to fill the case with a soft foam to take up the space of the missing cell, or trim the case down to make up the diffference of the missing cell.
