During the past year I would go to take a photo with my 4s and the battery read 45-60 %. As soon as I would take the 1st photo the battery would die! I an confident the battery replacement will eliminate this from happening. Battery has been replaced and is now recharging. What I did use was a toothpick to align the upper screw socket with the metal connections. The replacement took 20 minutes as I took my time and paid attention to the task at hand. Do read all of the help before you start.
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