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Intro History: iPhone 4S Battery Replacement

Edit by Jeff Suovanen —

Edit approved by Jeff Suovanen

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After
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Introduction
Replacing the battery on the iPhone 4S requires minimal disassembly. If your battery is swollen, [https://www.ifixit.com/Wiki/[What_ to_ do_ with_ a_ swollen_ battery|take appropriate precautions|new_window=true]].
For optimal performance, after completing this guide, calibrate your newly installed battery: DrainCharge 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 below 10%. Finally, then chargecharge it uninterrupted to 100%.
[video|https://www.youtube.com/watch?v=i196dj1cZls]
Conclusion
To reassemble your device, follow these instructions in reverse order.
If your iPhone reboots constantly after the replacement, you need to do a "Hard Reset" by holding down the Home- and Sleep-Button for about 10 seconds (until the device restarts).
If you have WiFi and/or Cellular connection problems with the new battery, try restoring the device using iTunes.
For optimal performance, calibrate your newly installed battery: Drain battery below 10%, then charge uninterrupted to 100%.
Repair didn’t go as planned? Check out our [https://www.ifixit.com/Answers/Device/iPhone%204S|Answers community] for troubleshooting help.