No, the headset battery is a built-in lithium ion battery and cannot be replaced.

1. One of the earphones is out of power, resulting in only one earphone connected to the phone;
2. Due to the particularity of Bluetooth earphones, electromagnetic waves in your area may interfere with the Bluetooth connection, and the headset may only be connected to a single headset after opening the charging case;
3. The earphone is in poor contact with the charging case, causing the earphone to fail to receive the power-on command from the charging case, and it cannot be automatically connected or only connects to one ear.
Solution:
1. Charge both earphones and make sure that both earphones are charged;
2. Try to stay away from microwave ovens, railway stations and other objects with large electromagnetic interference;
3. Check whether the golden yellow contacts of the earphone or the charging case are dirty. If so, use a soft cloth dipped in a small amount of medical alcohol to wipe the metal contacts of the earphone and the charging case. Be careful not to use water and corrosive liquids to wipe the metal contacts, and do not wipe them too hard to avoid water in the earphones or deformation of the contacts.
4.Try to put both earbuds back into the charging case, close the charging case lid and wait 5 seconds before taking them out and putting them back on.