Patent ID: 8563167

Claim:
A battery comprising: a case having a width, a thickness, and a length; a battery cell housed in an inside of the case; a battery-side terminal disposed on a side surface at one end of the case in a length direction and electrically connected to the battery cell; an engaging piece disposed at the one end of the case at which the battery-side terminal is positioned such that the engaging piece extends from an upper portion of the one end of the case in a length direction a same distance away from the one end of the case as a lower portion of the case at the one end extends in the length direction such that an edge of the engaging piece at the one end of the case in the length direction is even with an edge of the lower portion of the case in the length direction at the one end of the case, the engaging piece also located at an edge of the case in a width direction; and a second engaging piece disposed at the one end of the case at which the battery-side terminal is positioned such that the second engaging piece extends from the upper portion of the one end of the case in the length direction the same distance away from the one end of the case as a lower portion of the case at the one end extends in the length direction such that an edge of the second engaging piece in the length direction at the one end of the case is even with the edge of the case in the length direction at the one end of the case, the second engaging piece located at an edge of the case in the width direction on an opposite side of the case in the width direction from the engaging piece.