A non-limiting example hand-held electronic device includes a battery accommodating portion provided with an attaching portion which is formed in a rectangular shape in plain by longer first sides and shorter second sides, and formed with concave portions at corresponding positions on the first sides. A first battery unit is attached to the attaching portion by fitting first ends which form shorter sides of the first battery unit into the concave portions. When a second battery unit is to be attached to the same attaching portion, a second battery unit is attached within the first sides and the second sides without using the concave portions.