RFID Tags (IC tags) are attached to pallets for charge-discharge tests. The location of batteries in the pallet, product information, lot information, and inspection criteria for the lot are written to the RFID Tags (IC tags). In the test process, the test setup is changed based on this information. RFID Tags (IC tags) can also store process completion flags and instructions for the next process. After the charge-discharge tests are completed, sorting (ranking) information is written to the RFID Tag (IC tag). In the sorting (ranking) process, information in RFID Tags (IC tags) is read and automatically sorted by the robot.