Xiaomi Mi 9 Battery Replacement

Written By: Dominik Schnabelrauch

Comments: 24

Difficulty

Moderate

Steps

Time Required

50 minutes - 1 hour

Introduction

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

Although it’s possible to remove the battery without removing the loudspeaker unit we recommend doing so to make the removal procedure easier.

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

Tools

Parts

Step 1

Before you begin, switch off your phone.
Apply a heated iOpener to the rear glass to loosen the adhesive beneath the edges. Apply the iOpener for at least two minutes.

Step 2

Secure a suction handle to the lower edge of the rear glass, as close to the edge as possible.
If the phone's 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 gap between the glass and the frame.
Insert an opening pick into the gap.
If you have trouble, apply more heat to further soften the adhesive. Follow the iOpener instructions to avoid overheating.
Slide the opening pick to the bottom right corner of the phone.

Step 3

Insert a second opening pick and slide it to the bottom left corner to cut the adhesive.
Leave the opening picks in place to prevent the adhesive from resealing.

Step 4

Insert a third opening pick at the bottom left corner.
Start to slide the opening pick from the bottom left corner along the side of the Xiaomi Mi 9 to cut the adhesive.
Be aware of the rear cameras and only insert the tip of the opening pick. As the adhesive cools down it gets harder to cut. If necessary use your iOpener to reheat it.
Leave the opening pick in the top left corner to prevent the adhesive from resealing.

Step 5

Insert a fourth opening pick under the top left corner of the rear glass.
Slide the opening pick along the top to cut the adhesive.
Leave the opening pick in the top right corner to prevent the adhesive from resealing.

Be very careful at this point not to raise the cover too much, at the slightest bending the glass shatters. It just happened to me :(

enrica_spiga -

Step 6

Insert a fifth opening pick at the top right corner of the phone.
Slide the opening pick along the right edge to cut the remaining adhesive.

Step 7

Carefully lift the rear glass and remove it.
Before installing new adhesive and reassembly, remove any remaining adhesive from the phone, and clean the glued areas with isopropyl alcohol and a lint-free cloth.

Il y a un peu d'adhésif autour de l'appareil photo, c'est pour cela que ça peu forcer un tout petit peu.

Charles -

Step 8

Remove the ten Phillips #00 screws (3 mm length) that secure the motherboard cover.
There might be tamper proof sticker on some of the screws.

Note, the Explorer/Transparent edition does not use phillips #00 screws.

Jason Baginski - 20/08/20

It uses 0.8mm star screws(P2 Pentalobe in the iFixIt store)

Jason Baginski - 27/08/20

Thanks for mentioning Jason!

Dominik Schnabelrauch - 28/08/20

Step 9

Insert an opening pick at the top right corner of the motherboard cover.
Twist the opening pick sideways to pry up and slightly lift the motherboard cover.

Step 10

Carefully remove the motherboard cover including the charging coil / NFC antenna.

Step 11

Use a spudger to pry up and disconnect the battery flex cable.

Step 12

Remove the seven Phillips #00 screws securing the loudspeaker unit:
Four silver 3.2 mm long screws
Two yellowish 3.8 mm long screws
One black 2.8 mm long screw
Some screws may be hidden beneath tamper proof stickers.

I found that there was no need to remove the loudspeaker assembly at all. The battery adhesive was easy to pull out (by rolling it up on a screwdriver) without needing to remove the loudspeaker.

Jez S -

I can confirm this. Worked like a charm without taking the loudspeaker assembly out.

Alexander Niehoff -

Ich stellte fest, dass es überhaupt nicht nötig war, die Lautsprecherbaugruppe zu entfernen. Der Batteriekleber ließ sich leicht herausziehen (durch Aufrollen mit einem Schraubenzieher), ohne dass der Lautsprecher entfernt werden musste.
Gegenteilig sogar! Das Antennenkabel löste sich und hat dann außerordentlich viel Zeit gekostet den Stecker zu reparieren!!

Harald Sanders -

Step 13

Slide an opening pick under the right side of the loudspeaker unit.
Twist the opening pick sideways to pry up the loudspeaker unit until you can get a good grip.
There is still an antenna cable connected to the back of the unit.

Step 14

There is still an antenna cable connected to the back of the unit.
Carefully lift the loudspeaker unit and hinge it open towards the left side.

Step 15

Use a pair of tweezers to pry off and disconnect the antenna cable from the loudspeaker unit.
Remove the loudspeaker unit.
Before reassembly check your old loudspeaker for components that might need to be transferred to the replacement part such as the antenna flex cable with its coax connector.

Step 16

Use a pair of tweezers to peel the black ends of the adhesive tabs off the battery.

Step 17

Use a pair of tweezers to pull out the left adhesive tab from underneath the battery.
The adhesive tab underneath the battery can rip very easily. Make sure you pull out the tab in a slow and steady motion and in a flat angle. To prevent the adhesive tab from ripping, it's helpfull to twist the strip around the tweezers.
In case one of the adhesive tabs rips and it‘s not possible to pull it out completely, you can use isopropyl alcohol or an heated iOpener to loosen the adhesive. After the adhesive is soft enough use a prying tool such as an opening pick or a plastic card to pry out the battery.

Be careful with this one. My fully charged battery catch fire.

I tried to forcefully remove the battery after ripping the adhesive tab. I was bending it a lot.

It started to burn and smoke a lot. I didnt get any burn wounds but it left some nasty marks on the floor even though I throw it out on the balcony after 1 second.

Lars Pekkala - 22/10/21

Step 18

Use a pair of tweezers to pull out the right adhesive tab from underneath the battery.

Step 19

Use an opening pick to pry the battery out of its recess until you can get a good grip.

Step 20

Remove the battery.
Reusing a deformed or bent battery after it has forcefully been removed, is a potential safety hazard. Replace it with a new battery.
Remove any remaining adhesive from the midframe, and clean the glued areas with isopropyl alcohol and a lint-free cloth before applying new adhesive.

Conclusion

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

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 phone at the places where the old adhesive was located, not directly onto the battery. Press the new battery firmly into place.

For optimal performance, calibrate your newly installed battery: Charge it to 100%, and keep charging it for at least two more hours. Then, use it until it shuts off due to low battery. Finally, charge it uninterrupted to 100%

To reassemble your device, follow these instructions in reverse order.

Take your e-waste to an R2 or e-Stewards certified recycler.

Repair didn’t go as planned? Check out our Answers community for troubleshooting help.

Author

Dominik Schnabelrauch

Member since: 23/11/16

224647 Reputation

15 comments

Is it possible to swap mi 9 battery with mi 9 pro battery?

edwinyapeter - 14/12/19

yes I'm also interested. is it the same size? would like to replace with larger battery

Barbudo - 12/01/20

What type is the antenna plug?

Mine got damaged

Marcel - 18/03/20

Hi Marcel,

the Antenna connector is a COAX connector. You can find a little more information here.

Dominik Schnabelrauch - 19/03/20

I’ve changed the battery but device has not started even I tried to charge for 1-2 hours..( charger, USB-C cable checked). Btw, the symptoms was like the device started to turn off on around 50% of battery life. And charged too fast in about 10-15 minutes by the original fast charger. What could happen?

Andrew Blake - 30/04/20

Im also experiencing this issue. How can I fix this?

Leolando Tan -

Same. Did ya'll figure it out? Going to buy a new battery to see if that helps.

Odin Omdal Hørthe -

You must calibrate your new battery as above instructions.

wheelspinning -

Vielen Dank für die ausführliche Anleitung. Das hat mir 60€ Montagekosten bei Saturn erspart :) Gruß Iris

Iris Ock - 03/07/20

I change my battery but it seams that the quick charge has gone from 65% to 100%. Why?

Giulio - 26/03/21

You need to calibrate the new battery, the android software still thinks it has the old battery installed.

wheelspinning - 07/12/22

Superb guide, thank you! Battery replacement went very well and the iFixit Mi9 battery is superb quality.

Jez S -

In the section what do you need. Gluestrips for the battery should be included

Karel Tenkink -

What width glue strips do I need?

Simon Jackson -

I just did it with 1mm strips, put two of them on each sides to be secured but I believe 2mm would have been more appropriate.

Armand - 18/08/23