The components are installed within a five-sided box-like housing tray 14a, that is covered with a housing lid 14b and sealed with a housing sealing gasket 14c. The first exterior wall 28 includes a handle and electrical connectors 30. The connectors include high voltage power connectors and low voltage monitoring and communications connectors. A charging power input 30a draws power from the craft electrical bus, and when such mains power is A.C. the input power is coupled to the chargers. The chargers operate as an A.C. to D.C. rectifier to charge the battery cells. An engagement power output 30b delivers energy from the battery cells of the power storage cartridge. Additional connectors include a CANbus diagnostics connector 30c and an Ethernet communications connector 30d. As can be seen in FIGS. 2 and 3, the cartridge is sealed except for the overpressure relief port. High voltage battery connections and low voltage communications connections are all located on the front panel. Accordingly, when the cartridge is mounted into the rack, no electrical connections are made, just thermal contact between the back plate and the exterior cold plate of the platform or craft.