If the Bluetooth headset is charged with a fast charging head, there is no problem with charging for a short time, and there is no problem with charging one or two times, but remember to unplug it after it is fully charged. If you use a fast charging head to charge a Bluetooth headset, you can't charge it for a long time, so if it's full, put it this way. The Bluetooth headset is not much harm, because the fast charging head, when it charges, it will also determine whether the device has a fast charge.
If your Bluetooth headset is not fast charging, he determines that it is not fast charging, and it will be charged in ordinary charging mode. So it's not a bad thing.
Since the Bluetooth headset may not support the fast charge protocol, it cannot effectively fast charge when charging, just like the ordinary charger. It is recommended to use the charger provided with the Bluetooth headset or select the charger according to the charging standard required by the Bluetooth headset instruction manual.