Nonaqueous electrolyte battery, battery pack and vehicle

A battery pack comprising a nonaqueous electrolyte battery,

• wherein the nonaqueous electrolyte battery comprises:
• a positive electrode containing a positive electrode active material represented by the formula LixCo1-yMyO2 (M is at least one selected from the II group to XIV group metals except for Co, 0≦x≦1.1, 0≦y<0.5);
• a negative electrode containing a negative electrode active material which is a lithium-titanium composite oxide having a spinel structure;
• and
• a nonaqueous electrolyte containing a nonaqueous solvent containing γ-butyrolactone, 0.01 to 0.5% by weight of a first lithium salt which is dissolved in the nonaqueous solvent and is at least one of lithium salts represented by the following chemical formula (1) or (2), and 1 to 2.5 M/L of a second lithium salt which is dissolved in the nonaqueous solvent and is at least one selected from the group consisting of LiBF4 and LiPF6.