A battery pack system module may include a module bypass switch for allowing charge current to bypass the battery pack system module. The method uses a sterilization indicator and electronically links sterilization information with the articles subjected to the sterilization process. The cradle that has received the video recording reservation information performs a video recording reservation of the TV program on the basis of the video recording reservation information, and starts to record the TV program when a broadcast start time has come. If during the execution of the process 2, areas that can be reused become depleted, the execution of the insertion process reverts back to the process 1.