CMU01-H (Canion cell#8) is the lowest voltage cell in the pack, marked as B- and you can see a long white buss bar connection from that cell over to the middle section of the pack in the picture below.
CMU12-A (Canion cell#85) is the highest voltage cell in the pack, marked as B+
Link to a cell replacement video from the Canion developers:
https://youtu.be/YcL4UvGvWkA