(JP10233217-A)      A binder for rechargeable batteries with non-aqueous electrolyte comprising (a) a anode depolarising mix consisting of anode active material, electroconductive agents and a binder; and/or (b) a cathode depolarising mix consisting of cathode active material and a binder, comprises a bi-copolymer comprising 50-80 mol.% fluorovinylidene, and 20-50 mol.% tetrafluoroethylene.    The depolarising mix is also claimed.    USE -   The batteries are used for audio tape recorders, cameras, mobile phones, etc.    ADVANTAGE -   The binder is soluble in general purpose organic solvents, does not swell in a non-aqueous electrolyte. The battery performance is improved.    (EP964464-A1)      A binder for rechargeable batteries with non-aqueous electrolyte comprising (a) a anode depolarising mix consisting of anode active material, electroconductive agents and a binder; and/or (b) a cathode depolarising mix consisting of cathode active material and a binder, comprises a bi-copolymer comprising 50-80 mol.% fluorovinylidene, and 20-50 mol.% tetrafluoroethylene.    The depolarising mix is also claimed.    USE -   The batteries are used for audio tape recorders, cameras, mobile phones, etc.    ADVANTAGE -   The binder is soluble in general purpose organic solvents, does not swell in a non-aqueous electrolyte. The battery performance is improved.    (CN1240053-A)      A binder for rechargeable batteries with non-aqueous electrolyte comprising (a) a anode depolarising mix consisting of anode active material, electroconductive agents and a binder; and/or (b) a cathode depolarising mix consisting of cathode active material and a binder, comprises a bi-copolymer comprising 50-80 mol.% fluorovinylidene, and 20-50 mol.% tetrafluoroethylene.    The depolarising mix is also claimed.    USE -   The batteries are used for audio tape recorders, cameras, mobile phones, etc.    ADVANTAGE -   The binder is soluble in general purpose organic solvents, does not swell in a non-aqueous electrolyte. The battery performance is improved.    (US6265107-B1)      A binder for rechargeable batteries with non-aqueous electrolyte comprising (a) a anode depolarising mix consisting of anode active material, electroconductive agents and a binder; and/or (b) a cathode depolarising mix consisting of cathode active material and a binder, comprises a bi-copolymer comprising 50-80 mol.% fluorovinylidene, and 20-50 mol.% tetrafluoroethylene.    The depolarising mix is also claimed.    USE -   The batteries are used for audio tape recorders, cameras, mobile phones, etc.    ADVANTAGE -   The binder is soluble in general purpose organic solvents, does not swell in a non-aqueous electrolyte. The battery performance is improved.