Battery, method of manufacturing battery, battery pack, electronic device, electric vehicle, capacitive storage device, and power system

A battery including cladding members in which a metal layer, an external resin layer, an inner resin are laminated; an electrode body which includes a positive electrode and a negative electrode; electrolyte which is accommodated in the cladding member; a positive electrode lead which is electrically connected to the positive electrode; and a negative electrode lead which is electrically connected to the negative electrode, the thickness of the heat sealed portions of both end portions of the positive electrode lead is formed larger than the thickness of the heat sealed portion on a center line in a width direction of the positive electrode lead, and the thickness of the heat sealed portions of both end portions of the negative electrode lead is formed larger than the thickness of the heat sealed portion on a center line in a width direction of the negative electrode lead.