A circuit substrate, a plurality of supporting members that are arranged at intervals in a longitudinal direction of the circuit substrate and support both longitudinal ends of the circuit substrate, and a housing onto which the supporting members are fixe...

An internal resistance is maintained equal to or lower than 70 m©, and that a temperature rise of a battery during an external short circuit at an ambient temperature of 23 °C with a margin of error of plus or minus 2 °C does not exceed 45 °C.

Charging is started with charge voltage set to a first voltage value (lower than a normal charge voltage) by a charge voltage change means, the first voltage value being predetermined to ensure that secondary batteries constituting a parallel-arrangement b...