Patent ID: 8617741

Claim:
A battery comprising: a case having a width, a thickness, and a length, the case including a body section and a bottom section, the bottom section provided in a middle of the body section in a width direction and at one end of the body section in a thickness direction, the bottom section having a width which is smaller than the width of the body section; a battery cell housed inside of the case; a power supply terminal configured to supply an operating current to external electronic equipment from the battery cell; a bottom surface formed at one of surfaces of the bottom section in the thickness direction; locking pieces projecting from both side ends in the width direction of the bottom section such that a distance between tips of locking pieces positioned on opposite sides in the width direction is greater than the width of the bottom section and smaller than the width of the body section; and recessed portions opened to both sides in the length direction, the locking pieces hanging over the recessed portions.