Yes, some true wireless Bluetooth headsets have charging cases designed to allow you to put the headset into the box and charge the box at the same time. This design is called. Charging box reverse charging " . When the headset is placed in the charging case, the battery inside the charging case will charge the headset, and the charging case itself can also charge itself by connecting the charging cable.
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The advantage of this design is that when you are not using the headset, you can put the headset into the charging case for easy carrying and storage, while also charging the headset and the charging case, ensuring that the headset is fully charged the next time you use it. The function of reverse charging in the charging box has been widely adopted in some true wireless Bluetooth headsets on the market.
In theory, it is possible, but it is recommended not to use it this way, it is very unsafe, I give other companies to develop Bluetooth headphones, because of cost constraints, charging management that the choice of the program is not very good, can not guarantee security, in fact, most Bluetooth headphones are similar, therefore, when using with caution