A housing for an electrical power storage device is described herein. The housing includes a compartment having a base, a first wall extending from the base, and a second wall extending from the base. The housing also includes a first apron portion and a second apron portion to be used as part of a hold-down assembly for holding down the housing. The first apron portion and the second apron portion are positioned on the first wall and the second wall, respectively, between 15% and 85% of a height of the first wail and second wall from the base to a top of the first wall and the second wall.