A battery pack, module, and cell are all different classifications of a battery. A cell is the smallest level. It is one individual unit with a positive and negative lead with no bus bars or wires connecting it to other battery cells. A module connects battery cells in different series and parallel configurations (more on that in our certified technician course). These usually range anywhere from 2 to 6 kWh in total capacity. Lastly, a battery pack is the entire unit of battery modules, wired together to form the entire traction battery, this is the largest classification of a battery.