Introduction
Replacing the battery on the iPhone 4S requires minimal disassembly. If your battery is swollen, take appropriate precautions.
For optimal performance, after completing this guide, calibrate your newly installed battery: Charge it to 100% and keep charging it for at least two more hours. Then use your iPhone until it shuts off due to low battery. Finally, charge it uninterrupted to 100%.
What you need
Video Overview
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Power off your iPhone before beginning disassembly.
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Remove the two 3.6 mm Pentalobe P2 screws next to the dock connector.
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Pull the rear panel away from the back of the iPhone, being careful not to damage the plastic clips attached to the rear panel.
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Remove the rear panel from the iPhone.
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Remove the following screws securing the battery connector to the logic board:
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One 1.7 mm Phillips screw
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One 1.5 mm Phillips screw
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Carefully push the pressure contact away from the battery connector until it slides free from its position.
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Remove the pressure contact.
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Use a plastic opening tool to gently pry up the battery connector from its socket on the logic board.
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Place the tip of the tool between the loudspeaker enclosure and the metal cover of the connector, and lift the bottom edge of the connector first.
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Insert the edge of a plastic opening tool between the battery and the outer case near the bottom of the iPhone.
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Run the plastic opening tool along the right edge of the battery and pry up at several points to completely separate it from the adhesive securing it to the outer case.
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Use the exposed clear plastic pull tab to peel the battery off the adhesive securing it to the iPhone.
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Remove the battery.
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