Use a Y000 screwdriver to remove the eight screws securing the battery connector cover:

Six 1.3 mm-long screws

One 1.6 mm-long screw

One 1.9 mm-long screw

Throughout this repair, keep track of each screw and make sure it goes back exactly where it came from to avoid damaging your iPhone.

During reassembly, this is a good point to power on your iPhone and test all functions before you seal the screen in place. Be sure to power your iPhone back down completely before you continue working.