Electronic device and charging method thereof

An electronic device, comprising:

• a battery module;
• a power supply, configured to provide a supplied power;
• a power controller, electrically connected between the battery module and the power supply, to obtain an initial battery capacity of the battery module and a current time when the power supply is connected to an external power supply, and to control the power supply to charge the battery module;
• and
• a processor, electrically connected to the power controller, the processor is configured to set a preset target battery capacity and a charging completion time, and to obtain a charging battery capacity according to the preset target battery capacity and the initial battery capacity, to obtain a charging time interval according to the charging completion time and the current time, to calculate a battery capacity difference according to the charging battery capacity and the charging time interval, to convert the battery capacity difference into a charging power according to a power conversion equation, and to transmit the charging power to the power controller, and then the power controller converts the supplied power provided by the power supply to a charging voltage or a charging current according to the charging power, to charge the battery module to the preset target at a charging end time of the charging time interval.