Battery device and loading device for battery device

摘要

A battery device (1) that prevents mistaken connection to a main apparatus (2) includes a casing (1A) housing a battery. The casing has a loading surface section (1C) on a lateral surface on its outer periphery. The loading surface section is adapted for mounting to a setting surface section (2B) of a main apparatus (2). The loading surface section (1C) of the casing has a discrimination groove (4) having an opening end opened in an abutment surface (1D) and extending from the opening end parallel to the loading direction of the device (1) on the main apparatus (2). The abutment surface (1D) is formed on the loading surface of the casing for extending in a direction at right angles to the loading surface section (1C).