15 minuten - 1 uur
The phone started turning off randomly when the I still had charge on the phone (20~10%)... Looked online, and found that apple was swapping defective batteries....unfortunalty I bought the phone off ebay so I couldn't bring it in for warranty repair... found fixit.com and the decide to give it a try.
The repiar took about 20 minutes... I could have done it in about 10, if I didn't accidently disconnect an antenna connection when I was prying off the original battery.
Have good lighting !! the screws are REALLY small....
Be careful with other cables around the battery... I disconnected the antenna connection right below the 3 screen connection.
I immediately knew the problem when I reassembled the unit the first time and didn't get a network(cell) connection...
I also had a loose screw within the phone... apparently it came off one the connections on the screen side.... after seein that... I went around and made sure all the other screws within the unit was secure.
I should have replaced my scratched screen with a new one at the same time, but I wasn't sure if the my issue was a defective battery... now that I know how easy this is... I will have no hesitation in replacing the screen as well when my screen gets a little more scratched up.