How to change the battery and where can I get the battery

@rahulrahul3184 since iFixit does not yet have a guide for this, use something like this video The battery is in the right speaker shell. Once you have it apart, check the number on the battery. Use that to find the replacement.

While you work on your headphones, 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 a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!