TECHNOLOGY FOCUS - ELECTRONICS - Preferred Configuration: The battery configuration comprises a liquid motivating system including a pump pumping liquid continuously through the battery case, where the liquid includes a paraffin material. The battery configuration also comprises a set of spacers that, with the battery cells, define parallel flow channels along individual ones of the battery cells, where the spacers define a bottom channel, a top space, and where the parallel flow channels extend between the bottom channel and the top space; and a circuit board in the case that is also flooded by the liquid. Alternatively, the temperature-controlled battery configuration comprises: a set of standard lithium-ion cell packs with conductor tabs for accessing electrical power stored in the cell packs; at least one spacer between and separating adjacent ones of each of the cell packs, the spacer having a perimeter that holds at least a part of a weight of the adjacent cell packs and that defines with the adjacent cell packs a set of channels; positive and negative electrical conductors connecting the conductor tabs; and a casing containing the cell packs, spacers, conductors and being adapted for connection to a pump and heat exchanger; electrically-insulating thermally-conductive fluid, the case including an inlet and outlet connected to the channels for passing the electrically-insulating thermally-conductive fluid through it. Likewise, the configuration comprises a system having a pump and lines filled with the electrically-insulating thermally-conductive fluid for pumping through the inlet and the channels past the cell packs and through the outlet, where the fluid is a liquid, and where the system includes a heat exchanger to remove or supply heat to the liquid. The system is configured to selectively heat or cool the liquid. The battery configuration as well includes slugs that are electrically-conductive-and-thermally-conductive and others that are electrically-insulating-and-thermally-conductive; end spacers for clamping together a stacked arrangement of cells and spacers; and the circuit board positioned in the casing and operably connected to the system for controlling a temperature of the fluid, where the circuit board includes temperature and voltage sensors. Also, the circuit board includes thermistors and spring contacts mounted to an underside of the circuit board. The spacers and cells define channels for directing flow of the fluid. In a second alternative case, the temperature-controlled battery system comprises: the battery including the casing with an inlet and an outlet, and the set of standard Lithium-ion cell packs with channels between it positioned in the casing, the channels being adapted to communicate an electrically-insulating thermally-conductive fluid from the inlet past the cell packs to the outlet for controlling a temperature of the cell packs including directly impinging the fluid against outer surfaces of the cell packs; the pump; the heat exchanger; and fluid lines operably connecting the pump, the inlet, the outlet and the heat exchanger; the lines being filled with the thermally-conductive fluid.