The battery of my iPhone 4S, after 3 1/2 years, is discharged more quickly. I installed the new battery easily AKKU KING seems very well hold. We'll see in the long term but I am confident. I will amend my appreciation, if any. Fast shipping with two small screwdrivers needed for the 2 types of screws to remove and with a small plastic spatula to lift the relevant switch of the battery. I had watched before (via Google on Youtube) videos showing the replacement of the battery on an iPhone 4S: 2 screws to undo to open the iphone, then inside removing 2 screws to release the battery switch The spatula to easily remove the switch and help lift the battery retained by some adhesive. Up remembering to put a small removable parts ("battery ground strap") under the right screw and the plate of the switch ... It's simple with some order and precision, after having watched the videos. Warning: the battery of the iPhone 4S does not fit iPhone 4.
