Patent ID: 8228039

Claim:
A battery testing device that charges a chargeable secondary battery by using a charging module, comprising: an input control module that controls an input power that the charging module inputs to the secondary battery; an output control module that controls an output power that is output from the secondary battery and discharges the secondary battery; a temperature adjustment device configured to heat and cool the secondary battery, the temperature adjustment device configured to increase the temperature of the secondary battery from a first temperature of about 50° C. to a second temperature of about 150° C. for a period of about 3 hours when a battery capacity of the secondary battery falls below a threshold, wherein the temperature adjustment device judges whether the temperature of the secondary battery rises to 160° C. or more while performing adjustment to hold the temperature of the secondary battery at the second temperature, and displays a result of the judgment on an external device, wherein the input control module and the output control module are configured to cyclically perform a plurality of charge/discharge cycles, and each charge/discharge cycle includes: when the secondary battery reaches a fully charged state, the output control module starts discharging the secondary battery while the input control module stops charging the secondary battery using the charging module, and when the secondary battery reaches a predetermined charged state, the input control module starts charging the secondary battery using the charging module while the output control module stops discharging the secondary battery.