Why do my headphones keep on turning off after a few seconds?

@hihi33477 does it charge? It is either the charging connector that does no longer make connection to allow the battery to get charged or it is the battery (most likely). Change the battery first and see if that fixes it.

Since iFixit does not yet have a guide for this, try something likehttps://www.youtube.com/watch?v=Igbxbpql...

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.