Nonaqueous electrolyte battery

A nonaqueous electrolyte battery using an aqueous sealant composition in which a sealant layer formed from the aqueous sealant composition is provided between an insulating gasket attached to an opening of a metal container housing a power generating element and the metal container, and/or between the insulating gasket and a sealing body, wherein

• the aqueous sealant composition comprises an aqueous dispersion in an amount of 70 mass % or more and 97 mass % or less by mass of solid content, wherein the aqueous dispersion comprises an olefinic polymer as a main component, and a water-soluble polymer in an amount of 3 mass % or more and 30 mass % or less by mass of solid content,
• the aqueous dispersion comprises an olefinic polymer as a main component,
• the olefinic polymer is a modified olefinic polymer, and
• the modified olefinic polymer is a partial copolymer of a polymer selected from a group consisting of polyethylene, polypropylene, polybutene and ethylene-propylene polymers, and a polymerizable unsaturated organic acid selected from a group consisting of maleic anhydride, acrylic acid, methacrylic acid and esters thereof.