It is estimated that the power management circuit of the headset turns the voltage and current in the process of conversion, because of the heat emitted by the work. It does not rule out the reason of excessive charging current. Stop charging and wait for cooling.
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When charging, part of the electric energy will be converted into heat; When the current passes through the conductor, it will also generate some heat, and a slight scalding is a normal phenomenon, please rest assured. If you feel the hot situation is particularly obvious, it means that your charging current is too large, you need to change the charger, or it is estimated that the internal circuit is faulty, the charging current of the Bluetooth headset is generally not more than one hundred or two hundred mA, the current is not large, and it will not lead to fever.
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Charge it. If it breaks, it doesn't work. If it works, keep using it. I can't fix this myself