This study proposes a systematic research of charging from cell phone's battery power to wireless headset and an innovative design of this charging module. This module included a charging circuit and a holder for wireless headset so that the wireless headset can be attached to the cell phone during the charging process or when it is not in use. In addition, the average efficiency of most currently available chargers is lower than 50 %. The design of the new charging circuit in this study aimed to improve this issue. Test results show that this design of a power management circuit using cell phone battery can raise the power transfer rate to be more than 65.7% and conclude that this is a more power-saving method.