NOVELTY - A nonaqueous electrolyte battery (20) comprises a positive electrode comprising a positive electrode current collector and a positive electrode layer formed on at least one surface of the positive electrode current collector; a negative electrode comprising a negative electrode current collector and a negative electrode layer formed on at least one surface of the negative electrode current collector; a separator interposed between the positive electrode and the negative electrode; and a nonaqueous electrolyte.    USE - The nonaqueous electrolyte battery is used as power source for vehicles.    ADVANTAGE - The present invention provides a schematic cross sectional view of a flat nonaqueous electrolyte battery.    DETAILED DESCRIPTION - A nonaqueous electrolyte battery (20) comprises a positive electrode comprising a positive electrode current collector and a positive electrode layer formed on at least one surface of the positive electrode current collector; a negative electrode comprising a negative electrode current collector and a negative electrode layer formed on at least one surface of the negative electrode current collector; a separator interposed between the positive electrode and the negative electrode; and a nonaqueous electrolyte. The negative electrode layer comprises a negative electrode active material which can absorb and release lithium ions at a negative electrode potential of 0.4 V (V.S. Li/Li+) or more. The nonaqueous electrolyte battery satisfying the following equations (I) and (II): 1 less than or equal to Q2/Q1, and 0.5 less than or equal to C/A less than or equal to 0.999. A part of the negative electrode layer opposed to the positive electrode through the separator is a negative electrode opposed part. A part of the positive electrode layer opposed to the negative electrode through the separator is a positive electrode opposed part.    Q1 = increment of capacity at the negative electrode opposed part when the negative electrode opposed part which is fully charged is applied a potential shifted to a reducing side by 0.05 V from an open circuit voltage OCV1 between the negative electrode opposed part and metal lithium;    Q2 = increment of capacity at the positive electrode opposed part when the positive electrode opposed part which is fully charged is applied a potential shifted to an oxidizing side by 0.05 V from the open circuit voltage OCV2 between the positive electrode opposed part and metal lithium;    A = area of an opposed region comprising the negative electrode opposed part and unopposed part of the negative electrode layer; and    C = area of an opposed region comprising the positive electrode opposed part and unopposed part of the positive electrode layer.    INDEPENDENT CLAIMS are:    (1) a battery pack comprising the battery; and    (2) a vehicle comprising the battery pack.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic cross sectional view of a flat nonaqueous electrolyte battery.    Positive electrode terminal (1)    Negative electrode terminal (2)    Wound electrode group (6)    Container (7)    Nonaqueous electrolyte battery (20)