Please try the following troubleshooting steps:

- Fully charge both earbuds and use them at the same time to test how long the batteries last. 

- Test the side with problems separately to see how long it can last with a full charge.

If you have additional questions, please contact us at service@soundcore.com for further assistance. Make sure to mention that you have tried the steps in this FAQ so our agents do not ask you to repeat these steps.