Bluetooth headphones usually use a Micro USB or USB-C interface to charge, and the phone's direct charge cable is usually used for mobile phone charging, so you can not directly use the phone's direct charge cable to charge the Bluetooth headset. Even if connected directly, there may be compatibility issues or the risk of excessive current causing damage to the headset. Therefore, in order to ensure the normal use of Bluetooth headphones and extend their life, it is best to use the charging cable or charger that comes with the headset to charge.