Xiaomi Mi 9T Pro Battery Replacement

Introduction

Use this guide to replace a worn-out or dead battery in your Xiaomi Mi 9T Pro.

If your battery is swollen, take appropriate precautions.

For your safety, discharge your battery below 25% before disassembling your phone. This reduces the risk of a dangerous thermal event if the battery is accidentally damaged during the repair.

You’ll need replacement adhesive to reattach components when reassembling the device.

What you need

Step 1 Heat the rear glass

Xiaomi Mi 9T Pro Battery Replacement, Heat the rear glass: step 1, image 1 of 1

Prepare an iOpener and apply it to the rear glass for at least two minutes to loosen the adhesive underneath.
A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the phone—the display and internal battery are both susceptible to heat damage.

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Step 2 Insert an opening pick

Xiaomi Mi 9T Pro Battery Replacement, Insert an opening pick: step 2, image 1 of 3

Xiaomi Mi 9T Pro Battery Replacement, Insert an opening pick: step 2, image 2 of 3

Xiaomi Mi 9T Pro Battery Replacement, Insert an opening pick: step 2, image 3 of 3

Secure a suction handle to the bottom edge of the rear glass, as close to the edge as possible.
If the rear glass is cracked, the suction handle may not stick. Try lifting it with strong tape, or superglue the suction handle in place and allow it to cure so you can proceed.
Lift the rear glass with the suction handle to create a small gap between the back cover and the frame.
If you have trouble creating a gap, apply more heat to further soften the adhesive. Follow the iOpener instructions to avoid overheating.
Insert an opening pick into the gap you created.
Slide the opening pick to the bottom right corner to slice the adhesive.
Leave the opening pick in place to prevent the adhesive from resealing.

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Step 3 Slice the adhesive

Xiaomi Mi 9T Pro Battery Replacement, Slice the adhesive: step 3, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Slice the adhesive: step 3, image 2 of 2

Insert a second opening pick at the bottom edge of your phone.
Slide the opening pick to the bottom left corner to slice the adhesive.
Leave the opening picks in place to prevent the adhesive from resealing.

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Step 4 Slice the adhesive

Xiaomi Mi 9T Pro Battery Replacement, Slice the adhesive: step 4, image 1 of 3

Xiaomi Mi 9T Pro Battery Replacement, Slice the adhesive: step 4, image 2 of 3

Xiaomi Mi 9T Pro Battery Replacement, Slice the adhesive: step 4, image 3 of 3

If the adhesive becomes hard to cut, it has most likely cooled down. Use your iOpener for one to two minutes to reheat it.
Insert a third opening pick at the bottom left corner of your phone.
Slide the opening pick along the left edge of your phone to slice the adhesive.
Leave the opening pick in the top left corner to prevent the adhesive from resealing.

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Step 5

Insert a fourth opening pick underneath the top left corner of your phone.
Slide the opening pick along the top edge to slice the adhesive.
Leave the opening pick in the top right corner to prevent the adhesive from resealing.

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Step 6

Insert a fifth opening pick underneath the top right corner.
Slide the opening pick along the right edge of the rear glass to slice the remaining adhesive.
Do not try to remove the rear glass all the way yet. It might be adhered to the phone assembly because of the adhesive around the rear camera.

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Step 7 Loosen the rear camera adhesive

Xiaomi Mi 9T Pro Battery Replacement, Loosen the rear camera adhesive: step 7, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Loosen the rear camera adhesive: step 7, image 2 of 2

Tool used on this step:

Plastic Cards

$2.99

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Carefully try to separate the rear glass from the phone assembly. If you're successful you can ignore this step. In case the rear glass sticks to the rear camera adhesive, continue with this step.
Carefully insert a plastic or playing card at the right edge of the phone where the rear camera is located.
Use the plastic card to slice the adhesive along the rear camera frame.

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Step 8 Remove the rear glass

Xiaomi Mi 9T Pro Battery Replacement, Remove the rear glass: step 8, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Remove the rear glass: step 8, image 2 of 2

Remove the rear glass.
Apply new adhesive where necessary after cleaning the relevant areas with isopropyl alcohol (>90%).
Secure the new rear glass with pre-cut adhesive or double-sided adhesive tape. 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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Step 9 Unfasten the motherboard cover screws

Xiaomi Mi 9T Pro Battery Replacement, Unfasten the motherboard cover screws: step 9, image 1 of 1

Use a Phillips screwdriver to remove the twelve screws securing the motherboard cover:
Eleven 3.9 mm-long Phillips screws
One 2.3 mm-long Phillips screw

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Step 10 Pry up the motherboard cover

Xiaomi Mi 9T Pro Battery Replacement, Pry up the motherboard cover: step 10, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Pry up the motherboard cover: step 10, image 2 of 2

Insert the tip of an opening pick underneath the left edge of the motherboard cover.
Flip the opening pick sideways to pry up the motherboard cover.

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Step 11 Remove the motherboard cover

Xiaomi Mi 9T Pro Battery Replacement, Remove the motherboard cover: step 11, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Remove the motherboard cover: step 11, image 2 of 2

Use a pair of tweezers or your fingers to remove the motherboard cover.

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Step 12 Disconnect the battery cable

Xiaomi Mi 9T Pro Battery Replacement, Disconnect the battery cable: step 12, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Disconnect the battery cable: step 12, image 2 of 2

Use a spudger to disconnect the battery cable by prying the connector straight up from its socket.

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Step 13 Disconnect the interconnect cable

Xiaomi Mi 9T Pro Battery Replacement, Disconnect the interconnect cable: step 13, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Disconnect the interconnect cable: step 13, image 2 of 2

Use a spudger to disconnect the interconnect cable by prying the connector straight up from its socket.

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Step 14 Free the battery

Xiaomi Mi 9T Pro Battery Replacement, Free the battery: step 14, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Free the battery: step 14, image 2 of 2

During the following step do not fold the cable sharply and only bend it to avoid cable damage.
Fold the interconnect flex cable towards the charging port in order to get free access to both battery pull tabs and the battery.
You might want to use a small piece of tape to temporarily stick the cable onto your working surface to avoid accidentally damaging it during the battery removal.

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Step 15 Peel off the battery pull-tabs

Xiaomi Mi 9T Pro Battery Replacement, Peel off the battery pull-tabs: step 15, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Peel off the battery pull-tabs: step 15, image 2 of 2

Take care not to puncture or bend the battery with your tool—a punctured or bent battery may leak dangerous chemicals or cause a thermal event.
Use a pair of blunt nose tweezers or a clean fingernail to peel the orange adhesive strip labeled with a 1 off the battery.

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Step 16

Xiaomi Mi 9T Pro Battery Replacement: step 16, image 3 of 3

Repeat the previous pull-tab procedure on the other two pull-tabs.
Use a pair of blunt nose tweezers or a clean fingernail to peel the orange adhesive strip labeled with a 2 off the battery.
Peel the orange adhesive strip labeled with a 3 off the battery

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Step 17 Lift the battery

Xiaomi Mi 9T Pro Battery Replacement, Lift the battery: step 17, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Lift the battery: step 17, image 2 of 2

Grab the pull-tab end labeled with a 3 and pull up on the orange adhesive strip to lift the battery out of its recess and swing it up to an upright position.
Although these adhesive tabs are supposed to make the battery removal easier, they may require some force. If you're having trouble removing the battery, you can apply a heated iOpener to the center of the display to loosen the adhesive underneath.

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Step 18 Remove the battery

Xiaomi Mi 9T Pro Battery Replacement, Remove the battery: step 18, image 1 of 2

Xiaomi Mi 9T Pro Battery Replacement, Remove the battery: step 18, image 2 of 2

Peel the battery off the remaining adhesive.
Remove the battery.
Do not reinstall a damaged or deformed battery, as doing so is a potential safety hazard.
Secure the new battery with pre-cut adhesive or double-sided adhesive tape. In order to position it correctly, apply the new adhesive into the device at the places where the old adhesive was located, not directly onto the battery. Press the new battery firmly into place.
During reassembly, temporarily reconnect the battery to the motherboard to help align it correctly. Disconnect the battery after it is seated.

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Conclusion

If possible, turn on your device and test your repair before installing new adhesive and resealing.

Compare your new replacement part to the original part—you may need to transfer remaining components or remove adhesive backings from the new part before installing.

To reassemble your device, follow these instructions in reverse order. During reassembly apply new adhesive where necessary after cleaning the relevant areas with isopropyl alcohol (>90%).

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 Answers community for help.

22 other people completed this guide.