Patent ID: 7306878

Claim:
A battery apparatus comprising: a case having a width, a thickness, and a length; a battery cell accommodated inside the case; a battery-side terminal provided on an end surface positioned at one of ends of the case in a length direction and electrically connected to the battery cell; at least one locking piece on each of two lateral sides of the case and extending a distance in the width direction from the case, each locking piece forming a locking recess between the locking piece and an overhanging surface of the case; and a strengthening projection located in each locking recess and extending from each respective locking piece to the overhanging surface of the case, each strengthening projection extending from the case in the width direction a shorter distance than the distance the respective locking piece extends from the case in the width direction, wherein a bottom surface positioned on one side of the case in the thickness direction is aligned with an attachment surface of a battery attachment section of an electronic device to attach the battery apparatus by sliding the case along the length direction thereof, and the battery-side terminal comes in contact with an attachment section-side terminal of the battery attachment section.