Disclosed are systems, methods and devices for configuring a beacon transmitter for use in positioning operations of mobile devices. An open-circuit-voltage-to-state-of-charge characteristic has a capacity decrease estimation OCV region in which a relationship between the OCV and the SOC is assumed not to change due to degradation of the secondary battery 1a since a reference time point. The system further compares the second amount of storage space to the first amount of storage space and determines whether the second amount of storage space exceeds the first amount of storage space.