The housing includes an active battery module 20, a passive environmental management module 40 and cooling fans 60 to circulate air between the active battery module and the passive environmental management module. FIG. 2 shows the passive environmental management module 40 removed from the housing along with front and rear views of the active battery module 20. Cooling fans 60 include an inflow cooling fan 60a that draws cooled air from the passive environmental management module 40 into the active battery module 20. An outflow cooling fan 60c draws heated air from the active battery module 20 into the passive environmental management module 40. The cooling fans may consist of one inflow cooling fan and one outflow cooling fan. In the drawing, two smaller inflow cooling fans and two smaller outflow cooling fans are depicted. Other types and quantities of cooling fans may be provided.