Generally, Bluetooth headsets have a dedicated charger, if there is no dedicated charger, you can find a charging interface (yes. It is a small-mouth round hole, some MiniUSB universal interface) the same, and the rated output power is the same as the charger.
When charging, you should plug in all the plugs, not only more than half of them, so that the machine will be damaged for a long time. When inserting and removing the charging plug, it should be light, otherwise it will cause the plug to loose over a long time.
If the Bluetooth headset is plugged into the base or charging box, the charging time is longer than that directly charged to the Bluetooth headset.