A battery charging state of transmission and external charging system

A communicating portion of a battery charge status transmission device (4) of a load device (3) acquires the load status information of each vehicle loaded from the outside (1). A communicating portion with the terminal transmits the state information of load to a position of device management information (5). The load state information are grouped for transmission to reduce the number of transmissions, the communication traffic volume and the cost of communication with the management station device (5) and the operational load of the device management position (5).