Xiaomi Redmi Note 9S Battery Replacement

Introduction

Use this guide to replace a worn-out or dead battery in your Xiaomi Redmi Note 9S.

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.

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Étape 1 Heat the rear glass

Xiaomi Redmi Note 9S Battery Replacement, Heat the rear glass: étape 1, image 1 de 1

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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Étape 2 Insert an opening pick

Xiaomi Redmi Note 9S Battery Replacement, Insert an opening pick: étape 2, image 1 de 3

Xiaomi Redmi Note 9S Battery Replacement, Insert an opening pick: étape 2, image 2 de 3

Xiaomi Redmi Note 9S Battery Replacement, Insert an opening pick: étape 2, image 3 de 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.
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 into the gap you created.

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Étape 3 Slice the adhesive

Xiaomi Redmi Note 9S Battery Replacement, Slice the adhesive: étape 3, image 1 de 2

Xiaomi Redmi Note 9S Battery Replacement, Slice the adhesive: étape 3, image 2 de 2

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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Étape 4 Slice the adhesive

Xiaomi Redmi Note 9S Battery Replacement, Slice the adhesive: étape 4, image 1 de 3

Xiaomi Redmi Note 9S Battery Replacement, Slice the adhesive: étape 4, image 2 de 3

Xiaomi Redmi Note 9S Battery Replacement, Slice the adhesive: étape 4, image 3 de 3

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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Étape 5

Xiaomi Redmi Note 9S Battery Replacement: étape 5, image 3 de 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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Étape 6

Xiaomi Redmi Note 9S Battery Replacement: étape 6, image 3 de 3

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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Étape 7

Xiaomi Redmi Note 9S Battery Replacement: étape 7, image 3 de 3

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.

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Étape 8 Remove the rear glass

Xiaomi Redmi Note 9S Battery Replacement, Remove the rear glass: étape 8, image 1 de 2

Xiaomi Redmi Note 9S Battery Replacement, Remove the rear glass: étape 8, image 2 de 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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Étape 9 Unfasten the motherboard cover screws

Xiaomi Redmi Note 9S Battery Replacement, Unfasten the motherboard cover screws: étape 9, image 1 de 1

Use a Phillips screwdriver to remove the eleven 3.8 mm-long screws securing the motherboard cover.
One of the screws is hidden beneath an orange sticker.

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Étape 10 Pry up the motherboard cover

Xiaomi Redmi Note 9S Battery Replacement, Pry up the motherboard cover: étape 10, image 1 de 2

Xiaomi Redmi Note 9S Battery Replacement, Pry up the motherboard cover: étape 10, image 2 de 2

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

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Étape 11 Remove the motherboard cover

Xiaomi Redmi Note 9S Battery Replacement, Remove the motherboard cover: étape 11, image 1 de 2

Xiaomi Redmi Note 9S Battery Replacement, Remove the motherboard cover: étape 11, image 2 de 2

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

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Étape 12 Disconnect the battery cable

Xiaomi Redmi Note 9S Battery Replacement, Disconnect the battery cable: étape 12, image 1 de 2

Xiaomi Redmi Note 9S Battery Replacement, Disconnect the battery cable: étape 12, image 2 de 2

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

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Étape 13 Disconnect the power and volume button cable

Xiaomi Redmi Note 9S Battery Replacement, Disconnect the power and volume button cable: étape 13, image 1 de 3

Xiaomi Redmi Note 9S Battery Replacement, Disconnect the power and volume button cable: étape 13, image 2 de 3

Xiaomi Redmi Note 9S Battery Replacement, Disconnect the power and volume button cable: étape 13, image 3 de 3

Use a spudger to disconnect the power and volume button cable by prying the connector straight up from its socket.
Use your spudger to carefully fold the power and volume button cable to the side to free the battery.
Don't fold the cable sharply and only bend it to avoid cable damage.

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Étape 14 Disconnect the display cable

Xiaomi Redmi Note 9S Battery Replacement, Disconnect the display cable: étape 14, image 1 de 2

Xiaomi Redmi Note 9S Battery Replacement, Disconnect the display cable: étape 14, image 2 de 2

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

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Étape 15 Disconnect the motherboard interconnect cable

Xiaomi Redmi Note 9S Battery Replacement, Disconnect the motherboard interconnect cable: étape 15, image 1 de 2

Xiaomi Redmi Note 9S Battery Replacement, Disconnect the motherboard interconnect cable: étape 15, image 2 de 2

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

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Étape 16 Free the battery

Xiaomi Redmi Note 9S Battery Replacement, Free the battery: étape 16, image 1 de 3

Xiaomi Redmi Note 9S Battery Replacement, Free the battery: étape 16, image 2 de 3

Xiaomi Redmi Note 9S Battery Replacement, Free the battery: étape 16, image 3 de 3

During the following step, don't fold the cables sharply and only bend them to avoid cable damage.
Fold the display and the motherboard interconnect flex cable towards the charging port in order to get free access to the battery pull tabs.
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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Étape 17 Remove the stretch-release adhesive

Xiaomi Redmi Note 9S Battery Replacement, Remove the stretch-release adhesive: étape 17, image 1 de 3

Xiaomi Redmi Note 9S Battery Replacement, Remove the stretch-release adhesive: étape 17, image 2 de 3

Xiaomi Redmi Note 9S Battery Replacement, Remove the stretch-release adhesive: étape 17, image 3 de 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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Étape 18 Remove the pull-tabs

Xiaomi Redmi Note 9S Battery Replacement, Remove the pull-tabs: étape 18, image 1 de 2

Xiaomi Redmi Note 9S Battery Replacement, Remove the pull-tabs: étape 18, image 2 de 2

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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Étape 19

Xiaomi Redmi Note 9S Battery Replacement: étape 19, image 3 de 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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Étape 20 Remove the battery

Xiaomi Redmi Note 9S Battery Replacement, Remove the battery: étape 20, image 1 de 2

Xiaomi Redmi Note 9S Battery Replacement, Remove the battery: étape 20, image 2 de 2

Remove the battery.
Don't 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 before you press it into place to ensure correct alignment. Disconnect the battery after it's 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.

The best way to secure the new screen is to apply a sheet of custom-cut double-sided tape to the back of the screen.

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.

2 autres ont terminé cette réparation.