The battery cover on all 4 sets of my UConnect headphones broke. I designed a fix for them, and tested them with my family for a number of months to verify they work. If you're looking for a fix, I've listed them for sale on Etsy.

 

The website is:

https://www.etsy.com/shop/middlejtechnologies/

 

Here is a video that show you how to replace the door yourself.