Charging method and system, charging box, and bluetooth earphones

A charging method, applied to short distance wireless earphones, comprising the following steps:

• when it is detected that the short distance wireless earphones are placed in a charging box to charge, acquiring a current battery voltage of the short distance wireless earphones according to a data acquisition cycle corresponding to a preset communication frequency, and generating a communication data packet according to the current battery voltage;
• and
• sending the communication data packet to the charging box so that the charging box determines a target charging voltage based on the communication data packet and charges the short distance wireless earphones
• wherein the step of generating a communication data packet according to the current battery voltage comprises:
• comparing the current battery voltage with a previous current battery voltage, and determining a current charging state of the short distance wireless earphones according to a comparison result;
• and
• generating a communication data packet according to the current charging state and the current battery voltage.