NOVELTY - A nonaqueous electrolyte (30) comprises: a solvent; electrolyte salt; and polyacid and/or a polyacid compound. The solvent includes a halogenated cyclic carbonate, or at least one of unsaturated cyclic carbonates.    USE - In non-aqueous electrolyte battery (claimed), which is used in portable electronic devices such as camera-integrated VTRs, digital still cameras, cell phones, personal digital assistances, and laptop computers.    ADVANTAGE - The nonaqueous electrolyte improves charge and discharge cycle characteristics and suppresses gas production during high-temperature storage. The charging provides the negative electrode with a coating that originates from the halogenated cyclic carbonate (I) or in at least one of the unsaturated cyclic carbonates (II) and (III). The coating suppresses decomposition of the electrolytic solution components, and thus suppresses degradation of charge and discharge cycle characteristics. Charging also provides the negative electrode with a coating that originates from the heteropolyacid and/or heteropolyacid compound added inside the battery. In this way, decomposition of the halogenated cyclic carbonate (I) or the unsaturated cyclic carbonates (II) and (III), and gas production during high-temperature storage can be suppressed under a high temperature environment.    DETAILED DESCRIPTION - A nonaqueous electrolyte (30) comprises: a solvent; electrolyte salt; and polyacid and/or a polyacid compound. The solvent includes a halogenated cyclic carbonate of formula (I), or at least one of unsaturated cyclic carbonates of formulae (II) and (III).    X=F or Cl;    R1,R2,R4,R5,R6,R11=CnH2n+1;    n=0-4;    R3=CnH2n+1-m(X)m;    m=0-2n+1.    An INDEPENDENT CLAIM is included for a nonaqueous electrolyte battery comprising: either positive electrode (31); negative electrode (32), the nonaqueous electrolyte (where the polyacid and/or polyacid compound are contained in the battery); or a positive electrode, negative electrode and nonaqueous electrolyte that includes a solvent and electrolyte salt, where the negative electrode includes: a gelled first negative electrode coating that contains an amorphous polyacid and/or amorphous polyacid compound including at least one polyelement and second negative electrode coating that originates from the compound (I) or in the compound (II) or (III).    DESCRIPTION OF DRAWING(S) - The figure shows perspective view illustration configuration of a nonaqueous electrolyte battery.    Wound electrolyte unit (30)    Positive electrode unit (31)    Negative electrode lead (32)    Exterior member (40)    Adhesive film (41)