By Jeff Suovanen • Difficulty: Moderate
Use this guide to revive your iPhone 8’s battery life and performance with a new battery. If your battery is swollen, take appropriate precautions.
This guide instructs you to completely detach the display assembly. This is intended to prevent accidental damage to the display cables. If you feel comfortable removing the battery without putting undue strain on the display cables, you can skip the steps for detaching the display.
While it’s possible to remove the adhesive strips securing the battery as soon as you open the phone, the written guide strongly recommends first removing the Taptic Engine. Pull-stretch adhesives are designed to be pulled at a shallow angle. Doing so reduces the risk of breaking the lower adhesive strips accidentally, either by snagging them on the Taptic Engine, or by pulling the strips at too sharp of an angle.
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%.
- Power off your iPhone before beginning disassembly.
- Remove the two 3.5 mm pentalobe screws on the bottom edge of the iPhone.
- Heating the lower edge of the iPhone will help soften the adhesive securing the display, making it easier to open.
- Use a hairdryer or prepare an iOpener and apply it to the lower edge of the phone for about 90 seconds in order to soften up the adhesive underneath.
- Apply a suction cup to the lower half of the front panel, just above the home button.
- Pull up on the suction cup with firm, constant pressure to create a slight gap between the front panel and rear case.
- Insert an opening pick into the gap.
- Slide the opening pick up the left edge of the phone starting at the lower edge and moving towards the volume control buttons and silent switch, breaking up the adhesive holding the display in place.
- Stop near the top left corner of the display.
- Re-insert your tool at the lower right corner of the iPhone, and slide it around the corner and up the right side of the phone to separate the adhesive.
- Gently pull up on the suction cup to lift up the bottom edge of the display.
- Pull on the small nub on the suction cup to remove it from the front panel.
- Slide an opening pick underneath the display around the top left corner and along the top edge of the phone to loosen the last of the adhesive.
- Slide the display assembly slightly down (away from the top edge of the phone) to disengage the clips holding it to the rear case.
- Open the iPhone by swinging the display up from the left side, like the back cover of a book.
- Lean the display against something to keep it propped up while you're working on the phone.
- Remove four Phillips screws securing the lower display cable bracket to the logic board, of the following lengths:
- Two 1.3 mm screws
- Two 2.8 mm screws
- Remove the bracket.
- Use the point of a spudger to pry the battery connector out of its socket in the logic board.
- Bend the battery connector cable slightly away from the logic board to prevent it from accidentally making contact with the socket and providing power to the phone during your repair.
- Use the point of a spudger to pry the lower display connector out of its socket.
- Use the point of a spudger to disconnect the second lower display cable.
- Remove the three 1.3 mm Phillips screws securing the bracket over the front panel sensor assembly connector.
- Remove the bracket.
- Use the point of a spudger to disconnect the front panel sensor assembly connector.
- Remove the display assembly.
- Remove the three screws securing the bracket next to the Taptic Engine:
- One 1.3 mm Y000 screw
- One 2.7 mm Phillips screw
- One 2.9 mm Phillips screw
- Remove the bracket.
- Gently slide an opening pick between the antenna flex cable and the top of the speaker.
- Use the point of a spudger to pry up and disconnect the diversity antenna flex cable from the logic board.
- Slide an opening pick under the antenna flex cable to hold the socket down.
- Use the point of your spudger to pry up and disconnect the antenna flex cable from its socket, using the opening pick to hold the socket down.
- Remove the Wi-Fi diversity antenna.
- Remove the two screws securing the Taptic Engine:
- One 2.1 mm Phillips screw
- One 2.1 mm standoff screw
- Use the point of your spudger to pry the antenna cable socket up and away from the connector below it.
- Use the point of your spudger to pry up and disconnect the Taptic Engine flex cable.
- Remove the Taptic Engine.
- Each piece of adhesive has a black pull-tab at the end, which is lightly adhered to the front surface of the battery.
- Peel back the first battery adhesive tab from the bottom right edge of the battery.
- Slowly pull one battery adhesive tab away from the battery, towards the bottom of the iPhone.
- Pull steadily, maintaining constant tension on the strip until it slips out from between the battery and the rear case. For best results, pull the strip at as low an angle as possible, without snagging it on any of the iPhone's other components.
- If the battery adhesive tabs break during the removal process, use your fingers or blunt tweezers to retrieve the remaining length of adhesive, and continue pulling.
- Repeat the above steps to remove the remaining three adhesive strips.
- If you removed all of the adhesive strips successfully, skip the next step.
- Pull the string from side to side in a sawing motion all along the length of the battery to separate the adhesive. Do not deform or damage the battery.
- Remove the battery from the iPhone.
- Adhere the battery, disconnect it, and continue reassembling your device.
To reassemble your device, follow these instructions in reverse order. Don't forget to reapply the display adhesive before reinstalling the display.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Check out our iPhone 8 Answers community for troubleshooting help.