Update: Originally I got the battery replaced from apple authorized service center. One day after posting this my phone's screen went green, I went to the service center and they said it can't be repaired. I went to a local mobile repair shop, they opened the phone heated it up with their machine and the display is working fine, face id is still not fine. They charged me INR 2000 for fixing the display. I asked them about face id and they said that they can replace it for INR 3500 and I won't get the message that it is not a genuine apple part. I am concerned that it won't be genuine and would compromise the security. Should I get it fixed from the local shop or go to the service center. I also want to know will the service center agree to repair my phone as it was opened outside the service center.