5 - 30 minuten
After some cutbacks that cost my wife her job, we decided to switch phone companies (from ultra-expensive Verizon) to cut costs. This meant we needed new phones for our new no-contract plan. We found a good deal on used iPhones, only to find (to our disappointment) that the battery on one was dying after 6 hours of standby time.
I followed the instructions in the video that goes along with this repair. They were clear and easy to follow. 15 minutes after the mail carrier left my house I had a new battery installed. I've now forgotten to charge 2 nights in a row and still have 30% battery left.
Take a picture of the orientation of the antenna connector before you disassemble; it was too small to see well in the video.
The connector on the battery needs to have a little bend in it to fit properly. The shape was already there when I got the battery, I just had to bend it a bit more. The wires should go out from the battery then immediately straight back, then turn 180 degrees and come back toward the front before connecting to the phone. That little bend will sit between the battery and the battery enclosure when everything's in place.