Hello MarcinBalcerzyk,
Welcome to Microsoft Community.
If the Surface Earbuds you're using were purchased in 2020, they've been in use for almost four years.
The Surface Earbuds is just like any other electronic device, with continuous use, the battery will indeed be constantly worn. So if you need to replace the battery or repair the Earbuds, I can direct you to the Surface Earbud support team.
As for your third point here, I actually recommend that you try using one headset at a time, so that you can charge one headset while continuing to participate in a meeting with the other:
Charge Surface Earbuds - Microsoft Support
Here are specific steps to contact live support:
- Use your personal Microsoft account (not your organization account) to access the following links:
- Type Surface Earbuds, press Enter, and click "Contact Support" at the bottom:
- Select from the screenshot below and click Confirm:
- You will see contact options for Chat support and Phone support, please contact them during business hours:
I wish you all the best.
Best Regards,
Mitchell | Microsoft Community Support Specialist