1. May not be charged
2. Due to long-term use or placement of unused Bluetooth headphones, the battery may enter low power protection mode, resulting in failure to charge normally.
This is designed to protect the battery from excessive discharge.
3. To solve this problem, try the following:
a. Make sure the charging port and cable of the Bluetooth headset are well connected and not loose or damaged.
b. Try using different charging cables and chargers to eliminate problems with charging devices.
c. If the Bluetooth headset has a removable battery, try removing and reinstalling the battery, and then try charging it again. d. If the above methods are ineffective, you may need to contact the Bluetooth headset after-sales service or professional maintenance personnel to repair or replace the battery.