It may be caused by damage to the charging bin of the Bluetooth headset. In this case, you can check whether the Bluetooth headset charger is damaged. If you find damage, you can change the charging bin to charge the Bluetooth headset to try. Bluetooth headset charging should try to use the original charging bin, so as to better protect the battery of the Bluetooth headset, and power is easier to import into the battery inside the headset.
It is usually because the internal wiring iron of the headset is in poor contact, so it can not be charged. Use an electric pen to check whether there is current through the headset, if not, you need to change the iron sheet inside