Before replacing the battery of your iPhone 4S, you have to securely turn it off.
Maintain the power button on the top for a few seconds.
Then slide to the right to "power off" button in red.
Use a SIM card eject tool to remove the tray.
Remove the two screws circled in red located on both sides of the dock connector of your iPhone 4S.
Push the rear panel to the top.
It should move about 2mm.
Then lift it away as shown on the third picture.
With a cruciform screwdriver, remove the two screws circled in red.
Those screws maintain the battery cable to the battery connector .
Use a pair of tweezers to remove the metallic piece next to the phone's battery connector.
Use the nylon spudger to disconnect the logicboard's battery connector.
Attention : Gently pry the battery from the side as shown on the picture. Do not force it or it could damage the connector.
With a nylon spudger, gently pry to lift the left side of the battery.
Then grab the clear plastic and slowly pull to take the battery off its socket.
Be gentle when removing the battery. Apple uses quite some glue on their devices which prevents from removing it with this technique.
The battery of your iPhone 4S is now disassembled.
You can replace it by a new one.
To reassemble your iPhone 4S follow this guide in reverse order.
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