I finished populating one BMS PCB so it can handle 12 cells. The BMS is designed so that I may use it on battery boxes with as few as four cells and as high as 20 (the front battery box has 20 cells).
I have a battery test stand that uses AA sized lifepo cells in regular old AA battery holders. This makes it easy to populate it with as many cells as I need for testing the BMS.
Here it is charging for the first time.