Skip to main content

Phone · Apple · iPhone 12

Apple iPhone 12 Battery Replacement

Battery Replacement guide for the Apple iPhone 12

Moderate
~35 min
18 steps

Before you begin

Tools

  • P2 Pentalobe screwdriver
  • Y000 tri-point screwdriver
  • Heat gun or hair dryer
  • Suction cup tool
  • Plastic prying tools
  • Spudger tool
  • Tweezers

Parts / materials

  • Replacement battery
  • Battery adhesive removal strips
  • Isopropyl alcohol
  • Display frame adhesive seal

Safety

  • Discharge the battery below 25% before starting to minimize risk of thermal events.
  • Disconnect the battery before unplugging or connecting any internal cables.
  • Wear safety glasses to protect eyes from potential glass fragments.

Overview

# Apple iPhone 12 Battery Replacement Repair Guide Action-specific battery replacement walkthrough for the Apple iPhone 12. About 35 minutes across 18 steps. This DIY guide walks through battery replacement on the Apple iPhone 12 (iPhone series phone). Before you open the device, confirm the exact model number on the Apple settings screen or rear housing so your replacement part matches the iPhone 12 specifically—not a similar iPhone sibling. Most DIY techs finish this Apple iPhone 12 battery replacement in about 35 minutes when parts and tools are ready. Difficulty is rated intermediate for this model. Recommended tools for this Apple iPhone 12 job: P2 Pentalobe screwdriver, Y000 tri-point screwdriver, Heat gun or hair dryer, Suction cup tool, Plastic prying tools, Spudger tool, Tweezers. Parts and supplies: Replacement battery, Battery adhesive removal strips, Isopropyl alcohol, Display frame adhesive seal. Power the iPhone 12 off completely, remove SIMs/SD cards if present, and work on a clean, well-lit surface with a magnetic mat for screws. If a step feels wrong for your Apple iPhone 12, stop and compare the connector layout to the photos in this guide. When you prefer a same-day pro repair in Seattle instead, LML Repair can handle battery replacement for this model with tested parts and a workmanship warranty.

Step-by-step

  1. 1

    Power Off Device

    1 min

    Press and hold the side button and volume down button until the power slider appears. Slide to power off the iPhone completely.

  2. 2

    Remove Pentalobe Screws

    2 min

    Use a P2 Pentalobe screwdriver to remove the two 3.4 mm screws located on the bottom edge of the iPhone.

  3. 3

    Heat Bottom Edge

    2 min

    Apply heat from a heat gun or hair dryer to the bottom edge of the frame for two minutes to soften the display adhesive.

  4. 4

    Attach Suction Cup

    1 min

    Press a suction cup handle onto the lower half of the glass display, just above the bottom speaker port.

  5. 5

    Insert Opening Pick

    2 min

    Pull up firmly on the suction cup to create a slight gap, then insert an opening pick under the lower display edge.

  6. 6

    Slice Screen Adhesive

    3 min

    Slide the pick around the bottom corner and up the sides of the phone to cut through the perimeter water-resistance seal.

  7. 7

    Open Display Assembly

    2 min

    Swing the display open from the left edge like a book cover, resting it vertically against a sturdy support.

  8. 8

    Unscrew Lower Bracket

    3 min

    Use a Y000 tri-point screwdriver to remove the four screws securing the lower display logic board cover.

  9. 9

    Remove Lower Bracket

    1 min

    Use tweezers to lift and remove the metal lower display bracket from the device frame.

  10. 10

    Disconnect Battery

    1 min

    Use the flat edge of a spudger to pry the battery press connector straight up out of its socket.

  11. 11

    Disconnect Display Cables

    2 min

    Use your spudger to disconnect both the display cable and the touch screen press connector.

  12. 12

    Unscrew Upper Bracket

    2 min

    Remove the three Y000 tri-point screws holding the upper front sensor assembly connector bracket in place.

  13. 13

    Disconnect Front Sensors

    1 min

    Disconnect the front sensor and earpiece cable connector using the tip of a spudger.

  14. 14

    Remove Display

    1 min

    Lift the display assembly away from the rear enclosure and place it flat on a clean surface.

  15. 15

    Peel Adhesive Tabs

    2 min

    Use precision tweezers to unstick and peel back the black adhesive pull-tabs located at the top and bottom edges of the battery.

  16. 16

    Pull Stretch Adhesive

    4 min

    Slowly pull each adhesive tab outward at a low angle until the strip stretches out completely from under the battery.

  17. 17

    Remove Old Battery

    2 min

    Lift the battery out of the frame; if stuck, apply a few drops of isopropyl alcohol underneath to dissolve remaining adhesive.

  18. 18

    Install Replacement Battery

    3 min

    Apply new adhesive strips to the back of the replacement battery and press it firmly into position inside the rear case.

After your Apple iPhone 12 battery replacement

Power the iPhone 12 back on and test the battery replacement function before you put every screw away. Check touch/display response, charging, cameras, buttons, and wireless as relevant to this repair. If something fails after closing the device, reopen carefully and reseat the connectors for this Apple iPhone 12 job before assuming the part is defective. Keep leftover adhesive and screws labeled in case you need a second pass.

Keep learning

Explore more Apple iPhone 12 repair context in the encyclopedia, or open related DIY guides.

logo_footer

Stay in the loop

Get new guides, reviews, and repair news.

© 2026 LML Repair. All rights reserved.