It's not necessary to remove the battery in order to replace the front-facing camera; you can safely ignore the fact that the battery is missing in these images.

Use your spudger to pry up the front-facing camera and make sure it separates safely from the frame.

Peel back and remove any tape covering the front-facing camera's flex cable connector.

Pry up with your spudger or other ESD-safe tool to flip open the locking flap on the front-facing camera's ZIF connector.

Gently pull the camera's flex cable free from the ZIF socket.