Maybe the Bluetooth headset is in self-protection mode. When the Bluetooth headset is not used for a long time, the headset itself will activate a "self-protection" function. In a closed state, it will charge for a few minutes. It can be solved;

It may also be that the charger is not plugged in properly. If it is plugged in properly, it is a problem with the Bluetooth headset indicator light, or the headset is damaged.