Luckily, replacing the battery on the iPhone 4 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, calibrate your newly installed battery: Drain battery below 10%, then charge uninterrupted to 100%.
To reassemble your device, follow these instructions in reverse order. For optimal performance, calibrate your newly installed battery: Drain battery below 10%, then charge uninterrupted to 100%.
Compare your new replacement part to the original part—you may need to transfer remaining components or remove adhesive backings from the new part before installing.
'''To reassemble your device, follow the above steps in reverse order.'''
Take your e-waste to an [[E-Waste|R2 or e-Stewards certified recycler|new_window=true]].
Repair didn’t go as planned? Check out our [https://www.ifixit.com/Answers/Device/iPhone%204%20Verizon|Answers community] for troubleshooting help.