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Hey, Thank you for your feedback. We're sorry to hear that you're facing a battery deterioration issue with your WF-1000XM4, this is not the norm as we strive to deliver the best quality possible. If after charging the headset fully, the battery level goes below 80% after 30 minutes of use, you will need to contact us to be able to tackle this matter further for you. If you require any assistance, you can contact us using this link: https://cutt.ly/q8P6ehW Maryam @Sony support UK"
No when I received them they where more than a year old, so I'm going to have a go at replacing the batteries. I updated to firmware 2.1.0 to see if that helped but it didn't.
@talabags Do you mean you bought them second hand after one year? if the headset is within 2 years you shall contact them: sony support