Lipped retention member for retaining a battery array and retention method using lipped retention member

A method of retaining, comprising:

• providing a plurality of battery cell frames disposed along an axis within an enclosure, each frame within the plurality of frames including a frame foot that projects laterally outward;
• holding the plurality of battery frames relative to a floor of the enclosure using a retention member extending axially alongside of the plurality of battery frames, the retention member including a lip that projects laterally inward across the frame feet such that the frame feet are held between the lip and a floor of the enclosure;
• securing an axial end portion of the retention member directly to an endplate retention flange of an endplate that is disposed at an axial end of the plurality of battery cell frames, the endplate retention flange projecting laterally outward to laterally overlap with a portion of the retention member;
• and
• securing the endplate retention flange directly to the axial end portion of the retention member using a mechanical fastener that extends through an aperture in the endplate retention flange to engage a bore provided by retention member, the bore opening to an axially facing surface of the retention member, wherein the axially facing surface faces axially along the axis of the plurality of battery cell frames.