Nonaqueous electrolyte battery and battery pack

A nonaqueous electrolyte battery, comprising:

• a positive electrode;
• a negative electrode;
• a separator sandwiched between the positive electrode and the negative electrode;
• and
• a nonaqueous electrolyte,
• wherein:
• the negative electrode comprises a spinel-type lithium-titanium composite oxide as a negative electrode active material, Li4+xTi5O12 where 0≤x≤3, having a Li-absorbing potential of 1 V vs. Li/Li+ or more;
• an electrical resistance of the negative electrode in a discharged state is within a range of 100 Ω·cm to 100000 Ω·cm;
• a pore volume ratio of pores having a pore diameter of 1 μm or more in the separator is within a range of more than 70% to not more than 78%, the pore volume ratio being determined from a cumulative pore volume frequency curve of the separator according to a mercury intrusion porosimetry;
• and
• a mode diameter in a pore diameter distribution curve of the separator according to the mercury intrusion porosimetry is within a range of 1.1 μm to 2.6 μm.