The remaining battery charges of the left and right WF-1000XM4 earbuds are significantly different

While it is normal for the battery consumption rate to vary somewhat between the left and right earbuds due to function settings and conditions of use, a significant difference between the earbuds, when regularly used together, should not occur.

As a first step, check these articles to make sure you are charging the earbuds properly:

• The WF-1000XM4 charging indicator flashes red during wireless charging
• The headphones do not charge (WF-1000XM4)

If the issue still occurs, try the following:

1. Fully charge the earbuds.
2. Launch the Sony | Headphones Connect app, and connect the device and the headphones via Bluetooth®.
3. Make the following settings on the Sony | Headphones Connect app, and play any music:
   • Volume: Middle
   • CODEC: AAC
   • DSEE Extreme: OFF
   • Noise Canceling: ON
   • Other settings: OFF

   Note: The CODEC depends on the music files you are playing. You can check the CODEC using the Sony | Headphones Connect app.

4. Play the music on the connected device, and check to see if the music plays for more than 3 hours.

If the steps in these articles do not remedy the issue, please contact our Product Support team for further assistance.