iPhone 12 Battery Replacement

If your iPhone 12 is struggling to hold a charge, shutting down unexpectedly, or showing a "Service" warning under Battery Health, it is time for a replacement. This guide will walk you through the process of opening the phone, safely removing the old battery, and installing a fresh one. Expect a delicate procedure that requires patience, a steady hand, and careful handling of the fragile OLED screen.

1. 1

   Discharge and Power Down

   • Before starting, drain your iPhone 12 battery below 25% to minimize the risk of a thermal event if the battery is accidentally punctured.
   • Power off the device completely and unplug any cables.
2. 2

   Remove the Pentalobe Screws

   • Locate the two 6.7 mm pentalobe screws on either side of the Lightning port at the bottom edge of the phone.
   • Use a P2 pentalobe screwdriver to remove them, keeping them safely organized for reassembly.
3. 3

   Heat and Soften the Adhesive

   • Use a heat gun, hair dryer, or heated gel pad to warm the bottom edge of the iPhone for about 1 to 2 minutes.
   • This softens the strong waterproof adhesive securing the display to the frame, making it easier to separate.
4. 4

   Slice the Screen Adhesive

   • Apply a suction cup near the bottom edge of the screen and pull up with steady pressure to create a small gap.
   • Insert a thin plastic opening pick into the gap and slide it carefully around the bottom and sides to slice through the adhesive, taking care not to insert the pick more than a few millimeters to avoid damaging internal cables.
5. 5

   Open and Prop the Display

   • Gently swing the display open from the right side, using the left edge as a hinge (the display cables are on the left).
   • Prop the screen up at a 90-degree angle using a sturdy object to prevent strain on the delicate ribbon cables.
6. 6

   Remove the Bracket and Disconnect the Battery

   • Use a Y000 tri-point screwdriver to remove the screws securing the metal cover plate over the battery and display connectors.
   • Carefully lift the bracket out, then use a plastic spudger to gently pry the battery connector straight up from its socket on the logic board to cut all power.
7. 7

   Disconnect and Remove the Screen

   • Use your spudger to disconnect the display and digitizer cables, as well as the front sensor assembly connector.
   • Once all three cables are free, lift the display assembly away from the frame and set it in a safe, dust-free spot.
8. 8

   Remove the Lower Components

   • To gain clear access to the battery pull tabs, unscrew and remove the loudspeaker and Taptic Engine at the bottom of the phone.
   • This step significantly reduces the chances of tearing the adhesive strips during battery removal.
9. 9

   Pull the Adhesive Strips and Extract the Battery

   • Locate the four black adhesive pull tabs on the edges of the battery.
   • Grasp each tab with tweezers and slowly pull them out horizontally, keeping them flat and low to the frame to avoid tearing them.
   • If any tear, apply a few drops of 90%+ isopropyl alcohol under the battery, wait 2 minutes, and gently pry it up with a plastic card.
10. 10

    Install the New Battery and Reassemble

    • Clean any remaining adhesive from the frame, apply new adhesive strips to the back of the new battery, and press it firmly into place.
    • Reinstall the Taptic Engine, loudspeaker, apply a new display adhesive gasket to the frame, reconnect all cables (battery last!), screw the bracket back on, and seal the phone.

Device