Abstract: A battery mount from which a battery device is attachable and detachable results in a configuration that enables easy attachment and detachment of a battery having various shapes. The battery mount includes: connection terminals configured to fit to external terminals of the battery and having a shape along which the external terminals are slidable in at least one direction; and a lever rotatable about a fulcrum and located at a side at which the connection terminals are located when seen from the battery in a state where the external terminals are fitted to the connection terminals. The external terminals are configured to be elastically deformable to fit to the connection terminals by sandwiching the connection terminals therein.

Abstract: In a battery mounting unit to/from which a battery device is attachable and detachable, a configuration that enables easy attachment and detachment of the battery device having various shapes is obtained. A battery mounting unit 1 includes: connection terminals 13 configured to fit to external terminals 110 of a battery device 3 and having a shape along which the external terminals 110 are slidable at least in one direction; and a lever 30 rotatable about a fulcrum and located at a side at which the connection terminals 13 are located when seen from the battery device 3 in a state where the external terminals 110 are fitted to the connection terminals 13. The external terminals 110 are configured to be elastically deformable to fit to the connection terminals 13 by sandwiching the connection terminals 13 therein.

Abstract: A sealed battery with a cleavage groove is provided. A cleavage groove (41) is provided on a flat section (13) of the battery case (2) to form a cleavage line intersecting a ridge line (L) formed on the flat section of the battery case when the battery case swells up due to an increase in internal pressure. The cleavage line is, as viewed in a side view, a curved line made up of a first curved segment (42) curved to protrude in one direction and a second curved segment (43) curved to protrude in a direction forming an angle of 90 degrees or larger with the direction in which the first curved segment protrudes, the first and second curved segments being connected with each other. At least one of the first curved segment and the second curved segment intersects the ridge line.