[BrianG]

I'd shoot for 0.01-0.05v between cells. 0.1v is too much.

To measure each cell:
Cell 1-Red probe to red wire and black probe to 1st black wire next to the red one.
Cell 2-Red probe to 1st black wire next to the red one and black probe to 2nd black wire.
Cell 3-Red proble to 2nd blac wire and black probe to 3rd black wire.
And so on...