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|1. (WO2018146860) BATTERY AND CONNECTION DEVICE|
|Title:||BATTERY AND CONNECTION DEVICE|
The present invention achieves size reductions. The present invention includes: a casing having a cell accommodated therein; and a terminal portion having a connection terminal that is connected to an electrode terminal of a connection device. The casing has a top surface and a bottom surface that are located on opposite sides in the height direction, and two side surfaces that are located on opposite sides in the width direction and between the top surface and the bottom surface. In the casing, cutouts are respectively formed by stepped surfaces continuous with the side surfaces and by groove-forming surfaces continuous with the bottom surface. Guided grooves are respectively formed opening to the groove-forming surfaces. The guided grooves are located more toward the bottom surface than the stepped surfaces.