You start with a cell, or combination of cells. These could be ... hazardous chemicals inside the battery. The circuit symbol for a battery is made by joining two or more cell symbols.

If it's 6s and you've got 6 nacelles, you've got the the perfect setup to do just 6 larger individual cells (preferably with a PCB protection circuit, either on the cells or installed in the craft ...

packaged together and welded in series and parallel, attached to a battery management system (BMS). A "dead" e-bike battery may only have two or three truly dead cells inside, while the remainder ...