My iphone 4s battery was pretty far gone. It would deplete very fast. I use another phone but wanted to use my old one with my Uhandy Microscope attachment
I was not prepared for the tiny size of the screws. My eyes are not so good at close up work so was having a hard time focusing. I had to take frequent breaks to review the video and directions and calm my self down. I struggled with getting enough light to see what I was doing. There was a part the directions said might cause problems if fingerprints weren’t cleaned off. The photos didn’t point out what part that was and I couldn’t figure it out so omitted the cleaning. I had a bit of trouble getting the new battery connector seated in the socket and am still not sure how I got it in finally. Getting the tiny screws back in was an ordeal and I think I did strip one in the process..
Watch the videos carefully and read the directions through before beginning. Be very careful not to drop or lose the screws. They are magnetic thank goodness! You might want a magnifier and strong source of illumination.