Nonaqueous electrolyte battery, battery pack and positive electrode

A battery pack comprising:

• a terminal to be connected to an external device;
• and
• at least one nonaqueous electrolyte battery,
• wherein, the nonaqueous electrolyte battery comprises,
• a positive electrode comprising a positive electrode active material containing LixNi1−a−bCoaMnbMcO2 (0.9<x≤1.25, 0<a≤0.4, 0≤b≤0.45, 0≤c≤0.1, and M represents at least one element selected from the group consisting of Mg, Al, Si, Ti, Zn, Zr, Ca, and Sn);
• a negative electrode;
• a separator, disposed between the positive electrode and the negative electrode, comprising polyester, in which a pore volume in a pore size distribution according to a mercury intrusion porosimetry is in a range of 0.9 cm3/g to 3 cm3/g, and an air permeability value according to a Gurley method is in a range of 2 sec/100 ml to 15 sec/100 ml;
• and
• a nonaqueous electrolyte.