So not long ago my mom had the brilliant idea to buy wh 1000mx2 in a duty free in an european airport and lose the receipt. Because of taht the warranty was out of the question when we saw that they wouldn’t turn on so I decided to try to repair them my self and I did. I found out that there was a space between the battery and the connectors so I decided to put a piece of cardboard under the battery so the connection could be made. I am wondering if this is a viable solution, I am worried that I may cause some damages to the headphones if I leave cardboard there...