How do I replace the battery?

@ibisko since iFixit does not yet have a specific guide for this, use something like this video It's a complete teardown so it shows many steps that you will not need to do. It looks like you can remove teh battery without removing the circuit boards for as long as you make sure to disconnect the flex cables. Once you have that done you should be able to remove the battery as shown at the 5:00min mark

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 who has the same issues with their device. 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!