the invention provides an electronic device including a housing having a plurality of sidewalls defining a generally rectangular cavity within the housing to support therein a predetermined number of generally cylindrical batteries . one of the sidewalls defines an aperture extending through the sidewall and opening into the cavity . a support member is mounted in the housing and includes a support portion extending into the cavity to support inserted batteries in a position transverse to at least one of the sidewalls until all of the predetermined number of batteries are inserted into the cavity .