A remote battery charging system comprises an identifier for identifying different battery types within a device to a switch for allowing or disallowing charging of the battery. While a wireless base station 1 that transmits and receives a distance-measuring signal to and from a terminal 2 to be measured by wireless communication is disposed at each corner forming an equilateral triangular, the length of each side of the equilateral triangle is made to be a maximum communication distance of the wireless base station 1. The substrate preferably includes meta-materials. Examples include video and voice wherein a collision may result in degradation of signal quality at the receiving end.