Charging devices and related management systems and methods for charging fee management

A management system, comprising:

• a computer device;
• and
• a charging device for output power to an electric vehicle for a charging process, wherein the charging device can be operated in a plurality of operation modes, and the charging device connects to the computer device via a network, comprising:
• a communication unit receiving a charging request corresponding to an electric vehicle via the network;
• and
• a processing unit coupled to the communication unit, transmitting the charging request to the computer device when the communication unit received the charging request, such that the computer device, in response to the charging request, instructs the processing unit to perform a charging process for the electric vehicle, and calculates a charging fee for the charging process, wherein the charging fee is calculated based on charging data generated during the respective operation mode of the charging device and a respective charging method for each operation mode.