can be used with a smaller number of batteries the same is true for the retention bar for example a five battery retention bar with six slots may function with only four batteries and five side plates or with four batteries and two side plates the top extended channel frame member includes a second set of openings such as the opening 150 located along an outer arm 152 which may be used to connect the channel frame 110 to a frame member not shown of the enclosure 142 in operation a determination is made of the number of batteries to be restrained a plurality of side plates equal to the number of batteries plus one or less if the area is more stable are selected and attached to a channel frame member of appropriate length or greater length attachment is occasioned by fasteners received by the aligned openings in the channel frame member and the top flanges the channel frame member is attached to the equipment enclosure in any suitable manner well known to those familiar with equipment enclosures after the heating pad or low friction plastic sheet is installed the batteries are then inserted into the stalls created between the side plates after the batteries are in place the retention bar of at least a length to extend across all of the batteries is lowered into the front slots of the side plates with the retention bar in place the batteries are restrained from movement sideways by the side plates or very far upwardly by the step flanges top flanges or forwardly by the.