Introduction
This is a prerequisite-only guide! This guide is part of another procedure and is not meant to be used alone.
Use this guide to disconnect the battery in the Xiaomi 12.
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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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Use a Phillips screwdriver to remove the four 5.4 mm-long screws securing the flash connector cover.
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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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To reassemble your device, follow these instructions in reverse order.
Repair didn’t go as planned? Try some basic troubleshooting, or ask our Xiaomi 12 answers community for help.
