First, you can confirm that the charging cable is properly plugged into the headset and charging device, and check for damage.
Second, try to use another device or charger for charging to rule out the possibility of device failure. If the problem still exists, it may be a fault inside the headset, it is recommended to contact after-sales service or seek professional maintenance help. In addition, clean the charging interface in time to avoid dust or dirt affecting the charging effect. I hope the above suggestions can help you solve the problem.
The data cable is not connected, replace the data cable