[Problem] To reduce user effort when exchanging a battery and make it possible to ensure adequate user authentication-related security. [Solution] The present invention includes: a battery pack 2; a battery exchanger 3 that houses and charges the battery pack and that allows the charged battery pack to be loaned to users; a management server 4 that manages a battery exchange using the battery exchanger; and a registration device 5 that acquires facial images for registration which are used for user facial authentication. The registration device acquires the facial images for registration and specific information, which is information other than the facial images and is used to specify the users. The management server: acquires specific information for each user from the registration device to perform user management; performs facial recognition to determine whether a person of interest is a legitimate user by checking a facial image for authentication, which is acquired from a captured image of the person visiting for battery exchange, against the facial image for registration; and determines the legitimacy of the battery exchange on the basis of the result of this facial recognition.