Battery level management system

A battery level management method, comprising:

• outputting electric energy of a battery module and battery level information corresponding to stored electricity of the battery module;
• transmitting the battery level information to a control module and performing encoding by the control module according to the battery level information to output a control signal;
• transmitting the electric energy to a constant voltage module and outputting constant-voltage electric energy through the constant voltage module;
• transmitting the control signal to the constant voltage module and controlling turn-on and turn-off of the constant voltage module through the control signal;
• controlling, according to the turn-on and turn-off of the constant voltage module, the constant-voltage electric energy outputting different waveforms;
• and
• transmitting the constant-voltage electric energy to a computing module and performing decoding by the computing module according to the waveforms of the constant-voltage electric energy to output the battery level information.