Introduction
Your iPhone 4 won't hold a charge? Replace the battery! Luckily, replacing the battery on the iPhone 4 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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Your iPhone 4 rear cover may have either two #000 Phillips screws or Apple's 5-Point "Pentalobe" screws (second image). Check which screws you have, and ensure you also have the correct screwdriver in order to remove them.
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Remove the two 3.6 mm Pentalobe or Phillips #000 screws next to the dock connector.
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Pinch the rear panel with your fingers and lift it away from the iPhone. Alternatively, use a Small Suction Cup .
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Remove the single 2.5 mm Phillips screw securing the battery connector to the logic board.
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Use a plastic opening tool to gently pry the battery connector up from its socket on the logic board.
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Remove the metal clip covering the antenna connector.
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Use the clear plastic pull tab to gently lift the battery out of the iPhone.
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Before reconnecting the battery connector, be sure the contact clip (shown in red) is properly positioned next to the battery connector.
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