Abstract: A charging management system is provided based on communications between a charging device and a reporting device. The charging device may interface with the reporting device via a multi-contact surface, a conventional plug, or otherwise, the reporting device may typically comprise a portable, rechargeable device such as a smartphone, smart watch, camera, etc. Communications between the between the charging device and the reporting device take place via the same pair of power lines as are used for providing power from the charging device and the reporting device, by means of a non-volatile memory in the reporting device, which is accessed sequentially by one device or the other, and used to store information to be retrieved by the other to retrieve when activated. This exchange of information may implement a negotiation of a mutually acceptable power supply configuration, an authentication of a particular reporting device, etc.