Xiaomi Redmi Note 9 Battery Replacement

Introduction

Use this guide to remove or replace the battery on your Xiaomi Redmi Note 9.

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 Eject the SIM card tray

Xiaomi Redmi Note 9 Battery Replacement, Eject the SIM card tray: step 1, image 1 of 3

Xiaomi Redmi Note 9 Battery Replacement, Eject the SIM card tray: step 1, image 2 of 3

Xiaomi Redmi Note 9 Battery Replacement, Eject the SIM card tray: step 1, image 3 of 3

Insert a SIM card eject tool, a SIM eject bit, or a straightened paper clip into the hole on the SIM tray located at the left edge of the phone.
Press directly into the hole to eject the SIM card tray.
Remove the SIM card tray.

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Step 2 Heat the back cover

Xiaomi Redmi Note 9 Battery Replacement, Heat the back cover: step 2, image 1 of 1

The back cover of the Redmi Note 9 is held in place by plastic clips and adhesive. It might require some force to release the plastic clips.
Prepare an iOpener and apply it to the back cover 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 3 Insert an opening pick

Xiaomi Redmi Note 9 Battery Replacement, Insert an opening pick: step 3, image 1 of 3

Xiaomi Redmi Note 9 Battery Replacement, Insert an opening pick: step 3, image 2 of 3

Xiaomi Redmi Note 9 Battery Replacement, Insert an opening pick: step 3, image 3 of 3

Secure a suction handle to the bottom edge of the screen, as close to the edge as possible.
If the screen 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 phone assembly with the suction handle to create a small gap between the assembly and the back cover.
In case 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 in a steep angle into the gap you created. This might require some force.
Slide the opening pick to the bottom right corner to slice the adhesive and release the plastic clips holding the back cover in place.

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Step 4 Release the plastic clips and slice the adhesive

Xiaomi Redmi Note 9 Battery Replacement, Release the plastic clips and slice the adhesive: step 4, image 1 of 2

Xiaomi Redmi Note 9 Battery Replacement, Release the plastic clips and slice the adhesive: step 4, image 2 of 2

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

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Step 5 Release the plastic clips and slice the adhesive

Xiaomi Redmi Note 9 Battery Replacement, Release the plastic clips and slice the adhesive: step 5, image 1 of 3

Xiaomi Redmi Note 9 Battery Replacement, Release the plastic clips and slice the adhesive: step 5, image 2 of 3

Xiaomi Redmi Note 9 Battery Replacement, Release the plastic clips and slice the adhesive: step 5, image 3 of 3

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

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Step 6

Xiaomi Redmi Note 9 Battery Replacement: step 6, image 3 of 3

Insert a fourth opening pick in a steep angle at the bottom right corner of your phone.
Slide the opening pick along the right edge of your phone to release the plastic clips and slice the adhesive.
Leave the opening pick in the top right corner to prevent the adhesive from resealing.
Do not try to separate the phone assembly from the back cover all the way yet, the fingerprint cable is still connected to the motherboard.

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Step 7 Open the phone assembly

Xiaomi Redmi Note 9 Battery Replacement, Open the phone assembly: step 7, image 1 of 3

Xiaomi Redmi Note 9 Battery Replacement, Open the phone assembly: step 7, image 2 of 3

Xiaomi Redmi Note 9 Battery Replacement, Open the phone assembly: step 7, image 3 of 3

Flip your Redmi Note 9 over.
Avoid straining the fingerprint flex cable during the following procedure.
Carefully fold the back cover to the right side of the phone assembly like you would open a book from the back.
Slide the back cover underneath the phone assembly so that the phone assembly overlaps about one third of the back cover and the fingerprint cable is not strained.

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Step 8 Unfasten the motherboard cover screws

Xiaomi Redmi Note 9 Battery Replacement, Unfasten the motherboard cover screws: step 8, image 1 of 1

Use a Phillips screwdriver to remove the eleven 3.9 mm-long screws securing the motherboard cover.

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Step 9 Pry up the motherboard cover

Xiaomi Redmi Note 9 Battery Replacement, Pry up the motherboard cover: step 9, image 1 of 2

Xiaomi Redmi Note 9 Battery Replacement, Pry up the motherboard cover: step 9, image 2 of 2

Insert the tip of an opening pick underneath the bottom left edge of the motherboard cover.
Pry up the motherboard cover.

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Step 10 Remove the motherboard cover

Xiaomi Redmi Note 9 Battery Replacement, Remove the motherboard cover: step 10, image 1 of 2

Xiaomi Redmi Note 9 Battery Replacement, Remove the motherboard cover: step 10, image 2 of 2

Remove the motherboard cover.

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Step 11 Disconnect the fingerprint cable

Xiaomi Redmi Note 9 Battery Replacement, Disconnect the fingerprint cable: step 11, image 1 of 3

Xiaomi Redmi Note 9 Battery Replacement, Disconnect the fingerprint cable: step 11, image 2 of 3

Xiaomi Redmi Note 9 Battery Replacement, Disconnect the fingerprint cable: step 11, image 3 of 3

Use a spudger to disconnect the fingerprint cable by prying the connector straight up from its socket.
Separate the phone assembly from the back cover.

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Step 12 Disconnect the battery cable

Xiaomi Redmi Note 9 Battery Replacement, Disconnect the battery cable: step 12, image 1 of 2

Xiaomi Redmi Note 9 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 display cable

Xiaomi Redmi Note 9 Battery Replacement, Disconnect the display cable: step 13, image 1 of 2

Xiaomi Redmi Note 9 Battery Replacement, Disconnect the display cable: step 13, image 2 of 2

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

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Step 14 Disconnect the interconnect cable

Xiaomi Redmi Note 9 Battery Replacement, Disconnect the interconnect cable: step 14, image 1 of 2

Xiaomi Redmi Note 9 Battery Replacement, Disconnect the interconnect cable: step 14, 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 15 Free the battery

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Xiaomi Redmi Note 9 Battery Replacement, Free the battery: step 15, image 2 of 3

Xiaomi Redmi Note 9 Battery Replacement, Free the battery: step 15, image 3 of 3

During the following step do not fold the cable sharply and only bend it to avoid cable damage.
Fold the display and 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 cables onto your working surface to avoid accidentally damaging them during the battery removal.

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Step 16 Free the left battery pull-tab

Xiaomi Redmi Note 9 Battery Replacement, Free the left battery pull-tab: step 16, image 1 of 2

Xiaomi Redmi Note 9 Battery Replacement, Free the left battery pull-tab: step 16, image 2 of 2

Use a pair of blunt nose tweezers or your finger to carefully bend the battery cable to the left to get free access to the left battery pull-tab.

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Step 17 Remove the stretch-release adhesive

Xiaomi Redmi Note 9 Battery Replacement, Remove the stretch-release adhesive: step 17, image 1 of 3

Xiaomi Redmi Note 9 Battery Replacement, Remove the stretch-release adhesive: step 17, image 2 of 3

Xiaomi Redmi Note 9 Battery Replacement, Remove the stretch-release adhesive: step 17, image 3 of 3

The battery is secured to the rear case with two pieces of stretch-release adhesive.
Don't jab the battery with any sharp tools. A punctured battery may leak dangerous chemicals or catch fire.
Use a pair of blunt nose tweezers or a clean fingernail to peel down both battery adhesive pull-tabs to un-stick them from the top edge of the battery.

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Step 18 Remove the pull-tabs

Xiaomi Redmi Note 9 Battery Replacement, Remove the pull-tabs: step 18, image 1 of 3

Xiaomi Redmi Note 9 Battery Replacement, Remove the pull-tabs: step 18, image 2 of 3

Xiaomi Redmi Note 9 Battery Replacement, Remove the pull-tabs: step 18, image 3 of 3

Grab the first pull-tab with a pair of blunt nose tweezers or your fingers and slowly pull it away from the battery and towards the bottom edge of your phone.
Pull hard enough to maintain tension on the strip, but don't force it. Give it plenty of time to stretch and un-stick from under the battery.
Don't press down on the battery. Hold the phone firmly by its sides.
Keep the strip flat and unwrinkled. Try to pull evenly on the whole strip, rather than pulling mainly in the middle or on one side.
Pull at a low angle so the strip doesn't snag on the edge of the battery.
If the adhesive strip breaks off, try to retrieve it using your fingers or blunt tweezers, and continue pulling—but do not pry under the battery.
If the adhesive breaks off underneath the battery and can't be retrieved, continue with the next step.

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Step 19

Xiaomi Redmi Note 9 Battery Replacement: step 19, image 3 of 3

Repeat the previous pull-tab removal procedure on the second pull-tab.
Follow the same procedure as with the previous strip: don't press down on the battery, keep the strip flat and unwrinkled, and pull at a low angle.
If the adhesive breaks off underneath the battery and can't be retrieved, apply a few drops of high concentration (over 90%) isopropyl alcohol under the edge of the battery in the area of the broken adhesive strip(s).
Wait about one minute for the alcohol solution to weaken the adhesive.
Use the flat end of a spudger to gently lift the battery.
Don't try to forcefully lever the battery out. If needed, apply a few more drops of alcohol to further weaken the adhesive. Never deform or puncture the battery with your pry tool.

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Step 20 Remove the battery

Xiaomi Redmi Note 9 Battery Replacement, Remove the battery: step 20, image 1 of 2

Xiaomi Redmi Note 9 Battery Replacement, Remove the battery: step 20, image 2 of 2

Remove the battery.
Do not reinstall a damaged or deformed battery, as doing so is a potential safety hazard.
If there's any alcohol solution remaining in the phone, carefully wipe it off or allow it to air dry before installing your new battery.
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.

For optimal performance, calibrate your newly installed battery after completing this guide.

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.

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%).

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.

12 other people completed this guide.