External battery backup unit

An external battery backup unit, comprising:

• a battery cell set, comprising a plurality of battery cells;
• a power relay receiving power from an external power source;
• a charging controller, coupled to the battery cell set and the power relay to receive the power of the external power source, monitoring a status of the battery cell set and the power relay in order to determine a charging current's amplitude;
• a voltage and current monitoring unit, coupled to the charging controller and the battery cell set, transmitting the charging current from the charging controller to the battery cell set, wherein the voltage and current monitoring unit further monitoring the status of the battery cell set in order to control a discharging current's amplitude;
• a microcontroller, coupled to the charging controller and the voltage and current monitoring unit, responding to a change of state of the charging controller, the voltage and current monitoring unit, and the battery cell set, and further generating the external battery backup unit's system information using at least one condition of the external battery backup unit, wherein the microcontroller further encapsulating the external battery backup unit's system information into a plurality of data envelopes;
• and
• a signaling coupling unit, coupled to the microcontroller, the external power source, and a backend system, transmitting power of the external power source or power provided by the battery cell set to charge the backend system via a DC power line, and further embedding the plurality of data envelopes into the transmitted power;
• wherein the backend system is charged via the transmitted power and is informed of the external battery backup unit's system information via the plurality of embedded data envelopes.