3.3 battery system energy storage device that includes cells or cell assemblies or battery pack(s) (3.2) as well as electrical circuits and electronics Note 1 to entry: See A.3.2 and A.3.3 for further explanations. Battery system components can also be distributed in different devices within the vehicle. Note 2 to entry: Examples of electronics are the BCU and contactors. 3.4 capacity total number of ampere hours that can be withdrawn from a fully charged battery pack (3.2) under specified conditions 3.5 cell electronics electronic device that collects and possibly monitors thermal or electric data of cells or cell assemblies and contains electronics for cell balancing, if necessary Note 1 to entry: The cell electronics can include a cell controller. The functionality of cell balancing can be controlled by the cell electronics or by the BCU.