A battery is provided. The battery includes a battery enclosure that includes opposing top and bottom sides in a height direction, opposing left and right sides in a width direction, and opposing front and rear sides in a length direction. A first engaging portion extends in the length direction. A first lower surface is positioned on a plane between the top side and the bottom side in the height direction. A first rib is provided between a plane of the first engaging portion and the plane of the first lower surface in the height direction. A first upper surface is positioned on a plane between the top side and the bottom side in the height direction. A first wall is provided between the plane of the first lower surface and the plane of the first upper surface in the height direction.