Yes, that's right. We found this site - Amperex Technology Limited. But there are no links to the store or to parts (cells). someone tried to write to them, this was answered - "...we do not conduct retail sales of our products..."The maker of the inspire 1 battery if anyone was curious
The cells themselves can be composed and the controller should recognize them, but the point is in their sizes. You need to either look for cells by size or make a new package based on these sizes, but then you can increase the capacity of the cell to the desired power.