Mount ID Tags to the pallets holding the rechargeable batteries for charge/discharge inspection. Write product information, lot information, and inspection conditions for each lot to the ID Tags. Change the inspection process according to this information. In addition, store process completion flags and instructions for the next process to enable process history management. When the charge/discharge inspection is finished, write classification information based on the inspection results to the ID Tags. ID Tag memory capacity is limited and so associate addresses in memory with the locations of the batteries in the pallets beforehand. To classify the batteries, read the classification information stored in the ID Tags, and perform sorting (automatically) with a robot.