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.
What you need
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Before you begin, switch off your phone.
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Apply a heated iOpener to the rear glass to loosen the adhesive beneath the edges. Apply the iOpener for at least two minutes.
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Secure a suction handle to the lower edge of the rear glass, as close to the edge as possible.
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Lift the rear glass with the suction handle to create a gap between the glass and the frame.
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Insert an opening pick into the gap.
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Slide the opening pick to the bottom right corner of the phone.
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Remove the ten Phillips #00 screws (3 mm length) that secure the motherboard cover.
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Remove the seven Phillips #00 screws securing the loudspeaker unit:
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Four silver 3.2 mm long screws
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Two yellowish 3.8 mm long screws
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One black 2.8 mm long screw
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Use a pair of tweezers to peel the black ends of the adhesive tabs off the battery.
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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.
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.
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15 Comments
Is it possible to swap mi 9 battery with mi 9 pro battery?
Hi Marcel,
the Antenna connector is a COAX connector. You can find a little more information here.
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?
