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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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Push the rear panel toward the top edge of the iPhone.
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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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If there's any alcohol solution remaining in the phone, carefully wipe it off or allow it to air dry before installing your new battery.
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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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I used "flat" 1mm screwdriver instead of 5-Point one with success.
When I put the battery in, the lead going from the battery to the plug was fully extended. You need to fold it back on itself - look at the shape of the battery you just removed.
Unfortunately, I didn't realize this until AFTER I clipped the new battery in. I tried to align the battery to where it should go while it was still connected, in the process I broke one of the soldered connections on the battery connector. Wouldn't boot up and did the continuous battery recycling.
Luckily, I was able to put the old battery back in and all was working again. I don't think I'll attempt a new battery at this point...
yes they need to add that
Tim -
Hugely disappointed. iFixit sends me a battery that has corrosion on it with a black X marked on the clip, looks like it is used? And don't even mention this small part, or the folding over. C'mon iFixit you've done great stuff this is not one of them.
Now that I put my old battery back in, my phone turns on but won't charge. Great. I have 68% until I have a dead phone, no battery. The battery I got from ifixit was a dud. This is a complex process--I've changed out displays on a laptop, hard drives, cpus. This is NOT a "moderate" job and needs major rework on their tips.