Good news! I got the new cell in, installed it, and it appears to be working. I took the current settings from both sides of the cell and both appear to be good. I'll run it at 100% for a couple days to make sure.
The cell came from a "pool store" shop (Amazon) that says these are new, OEM cells. The cell looks new, and looks OEM, but, it came in a box, loose, with OEM instructions and other stuff that comes with a new cell. I think maybe they take these out of new SWCGs and just sell the cell.
We'll see how long they last!