A battery pack including: a nonaqueous electrolyte secondary battery including an external connection terminal; and a discharge control mechanism which controls discharge of the nonaqueous electrolyte secondary battery when a surface temperature of the nonaqueous electrolyte secondary battery exceeds a discharge control temperature T.sub.1 (.degree. C.) represented by T.sub.1=T.sub.0+QA (1) where T.sub.0 is an ambient temperature in a range of 0 to 60.degree. C., Q is 8 (.degree. C./C), and A is a discharge rate (C) of the nonaqueous electrolyte secondary battery in a case where a current required for discharging a nominal capacity of the nonaqueous electrolyte secondary battery in one hour is 1C, and is within a range of 4C to 7C.

 
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