Because one earbud acts as the primary earbud and the other as the secondary earbud, a 10 - 20% difference in battery level and a playback time difference of less than 1 hour are normal.

If the battery level difference exceeds 20% or the playback time difference exceeds 1 hour, try the following:

1. Make sure you've removed the protective film from the earbuds.

2. Clean the charging contacts on the case and earbuds with a clean cloth or cotton swab lightly moistened with rubbing alcohol to ensure proper contact.

3. Make sure the charging case has sufficient charge.

4. Test the battery life during music playback.

If you encounter any other issues or your issue has not been resolved, please contact us for further assistance.