Patent ID: 7700224

Claim:
A battery, comprising: a case of a flattened substantially rectangular plate shape having an upper face and a lower face positioned at the opposite ends in a thicknesswise direction, left and right side faces positioned at the opposite ends in a direction of a width having a greater dimension than the thickness and a front face and a rear face positioned at the opposite ends in a forward and backward direction of a length having a greater dimension than the width; a battery cell accommodated in an inside of said case; and a connector section provided on the front face of said case, wherein each of said left and right side faces of said case includes a locking recess for lockably engaging with a spring for biasing said case, and wherein a projecting wall is provided on each of said left and right side faces, the projecting wall projects outwardly from the left and right side faces in a widthwise direction and extends at least substantially an entire length of a lengthwise direction of the case, and wherein the locking recesses are grooves disposed on an outer edge of the projecting wall.