| 摘要 |
PROBLEM TO BE SOLVED: To provide accurate real-time information easily, efficiently, and inexpensively. SOLUTION: This relates to a battery pack in the portable remote terminal device 10 of a radio communication system. The battery pack is provided with one or more secondary battery cells 2, a reference time circuit generating relative reference time information cv, an identifying circuit 5 delivering the battery pack 1 with specific identifying information ID assigned thereto, and an interface circuit 6 delivering the portable remote terminal device 10 connected thereto with the specific identifying information ID and the relative reference time information cv and updating the real-time information of the portable remote terminal device 10 based on the specific identifying information ID and the relative reference time information cv. Furthermore, this relates to the portable remote terminal device 10 of the radio communication system. The portable remote terminal device 10 is provided with an interface circuit 11 receiving the specific identifying information delivered from the battery pack 1 connected with the portable remote terminal device 10, a real-time circuit generating real-time information delivered to the portable remote terminal device 10, and a control circuit 12 determining whether the battery park 1 connected based on the received specific identifying information ID was connected previously and updating real-time information based on the accurate time information tm in response to the determination result. |
