Battery

A battery (20) includes a metallic outer can (1), a wound electrode group (2), a positive electrode-lead (3), a negative electrode-lead (4), a positive electrode insulating cover (25), and a negative electrode insulating cover (26). The negative electrode insulating cover (26) is formed using an insulating material selected from polypropylene, polyimide, polyphenylene sulfide (PPS), and polyester (PET).