NOVELTY - The lithium/iron disulfide electrochemical battery cell comprises a housing including a positive and a negative terminal, a non-aqueous electrolyte, and a spirally wound electrode assembly disposed within the housing. The housing comprises a negative electrode consisting of lithium or a lithium alloy, a lead electrically connecting the negative electrode to the negative terminal, a positive electrode including iron disulfide coated onto a metal foil that is electrically connected to the positive terminal, and a macroporous membrane comprising a single layer.    USE - The lithium/iron disulfide electrochemical battery cell is useful as portable power sources in high power devices such as photoflash and digital still camera.    ADVANTAGE - The lithium/iron disulfide electrochemical battery cell has high discharge capacity and energy density and improved reliability, and provides good resistance to internal short circuits.    DETAILED DESCRIPTION - The lithium/iron disulfide electrochemical battery cell comprises a housing including a positive and a negative terminal, a non-aqueous electrolyte, and a spirally wound electrode assembly disposed within the housing. The housing comprises a negative electrode consisting of lithium or a lithium alloy, a lead electrically connecting the negative electrode to the negative terminal, a positive electrode including iron disulfide coated onto a metal foil that is electrically connected to the positive terminal, and a macroporous membrane comprising a single layer and amorphous, biaxially-oriented polyethylene with a dielectric breakdown voltage of greater than 2400 volts and a ratio of transverse tensile stress/machine direction tensile stress of greater than or equal to 10/13. A size of iron disulfide is less than or equal to 62 microns. A Brunauer, Emmett and Teller (BET) specific surface area and a thickness of the membrane are 15-40 m2/g and 10-20 microns respectively. A ratio of transverse tensile stress/machine tensile stress is greater than or equal to 12/15. The transverse tensile stress/machine tensile stress is 10/13 to 12/15.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of an electrochemical battery cell.    Cell cover (14)    Gasket (16)    Anode (18)    Cathode (20)    Separator. (26)