Patent ID: 8883334

Claim:
A battery to hold a battery cell, the battery comprising: a first surface; an end surface approximately perpendicular to the first surface and forming a corner edge with the first surface along an edge of the first surface in a lateral direction; an output terminal provided at the corner edge formed by the end surface and the first surface, wherein the output terminal includes electrode slits that are opened to both the end surface and the first surface, and the electrode slits include electrodes to output power from the battery cell; first and second grooves provided in the first surface that extend away from the corner edge along the first surface, wherein the output terminal is provided between the first and second grooves in the lateral direction; and first and second step surfaces that extend along respective first and second lateral sides of the first surface in a longitudinal direction approximately parallel to the first surface, wherein the first and second step surfaces are stepped with resect to the first surface, and the first and second step surfaces include, respectively, first and second chamfered portions that are chamfered with respect to the first surface.