Introduction
Use this guide to replace the battery in your Xiaomi 12.
Allow your phone's battery to fully drain before starting repairs before disassembling your phone. This reduces the risk of fire if the battery is accidentally damaged during the repair. If your battery is swollen, take appropriate precautions.
You'll need replacement adhesive for the rear glass and the battery in order to complete this repair.
Retaining water resistance after the repair will depend on how well you reapply the adhesive, but your device will lose its IP (Ingress Protection) rating.
What you need
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Unplug any cables and fully shut down your phone.
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Prepare an iOpener and apply it to the rear glass for two minutes to loosen the adhesive underneath.
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Apply a suction handle to the center of the rear glass's bottom edge, as close to the edge as possible.
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Pull up on the suction handle with strong, steady force to create a gap between the rear glass and frame.
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Insert an opening pick where the charging port is located.
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Slide the opening pick to the bottom right corner of the rear glass to slice its adhesive.
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Leave the opening pick in place to prevent the adhesive from resealing.
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Insert a second opening pick at the bottom right corner and slide it to the bottom left corner of the rear glass to slice the adhesive.
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Leave the opening pick in place to prevent the adhesive from resealing.
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Insert a third opening pick under the bottom left corner of the rear glass.
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Slide the opening pick along the left edge of the rear glass to slice the adhesive.
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Leave the opening pick in the top left corner to prevent the adhesive from resealing.
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Insert a fourth opening pick under the top left corner of the rear glass.
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Slide the opening pick along the top edge of the phone to slice the adhesive.
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Leave the opening pick in the top right corner to prevent the adhesive from resealing.
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Insert a fifth opening pick under the top right corner of the rear glass and slide it to the bottom right corner to slice the remaining adhesive.
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Remove the rear glass.
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This is a good point to power on your phone and test all functions before sealing it up. Be sure to power your phone back down completely before you continue working.
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During reassembly, secure the rear glass with pre-cut adhesive or double-sided tape after cleaning the relevant areas with high-concentration isopropyl alcohol (>90%) and a lint-free cloth.
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After installing the rear glass, apply strong, steady pressure to your phone for several minutes to help the adhesive form a good bond—a stack of heavy books works well.
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Insert an opening pick under the bottom right corner of the charging coil.
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Slide the pick toward the charging port to separate the adhesive.
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Insert a pick under the bottom left corner of the charging coil and separate its adhesive.
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An orange water damage indicator sticker covers a screw on the top edge of the motherboard cover. Pierce through it with your screwdriver or use tweezers to remove it.
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Use a Phillips screwdriver to remove the four 5.4 mm-long screws securing the flash connector cover.
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Use tweezers or your fingers to remove the flash connector cover.
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Use the flat end of a spudger to pry up and disconnect the the flash press connector.
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Use a Phillips screwdriver to remove the seven screws securing the motherboard cover:
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Five 5.4 mm-long black screws
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Two 4.4 mm-long silver screws
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Insert an opening pick under the bottom right corner of the motherboard cover and pry it up.
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Slide the pick up along the right edge of the motherboard cover.
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Twist the pick to release the remaining clips.
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Use the flat end of a spudger to disconnect both battery cables by prying the connectors straight up from their sockets.
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Use the flat end of a spudger to pry up and disconnect the interconnect cable press connector.
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Flip the interconnect cable over the bottom of the phone to access to the battery.
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Use a pair of blunt nose tweezers or a clean fingernail to peel up the orange pull-tab labeled "A".
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Grip both sides of the pull-tab labeled "A" and pull up to lift the battery out of its recess.
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Peel the battery off of the remaining adhesive and remove it.
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Use tweezers or your fingers to remove the old adhesive from the frame.
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Use high-concentration isopropyl alcohol (>90%) and a lint-free cloth to remove any remaining adhesive residue.
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Temporarily connect the replacement battery's cables to the motherboard and lay the battery in its recess to ensure proper fit and orientation.
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If your replacement battery isn‘t already equipped with adhesive, apply double-sided tape such as Tesa Tape directly to the battery recess where the old adhesive was.
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Lay the replacement battery in its recess and press down firmly on the entire surface of the battery to secure it.
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To reassemble your device, follow these instructions in reverse order.
For optimal performance, calibrate your newly installed battery after completing this guide.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting, or ask our Xiaomi 12 answers community for help.
To reassemble your device, follow these instructions in reverse order.
For optimal performance, calibrate your newly installed battery after completing this guide.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting, or ask our Xiaomi 12 answers community for help.
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