Xiaomi Poco X3 NFC - Replacing the battery

Use our checklist to test the basic functions of your Xiaomi Poco X3 NFC before repairing. This way you can check afterwards if your repair was successful.

1. Press and hold the power button until the Power Off menu appears on the screen.
2. Tap Power off in the displayed menu. Your smartphone will shut down within a few seconds.

The edge of the back cover is heavily glued. It is therefore essential to first heat it up sufficiently. Use a hot air device for this purpose, such as a heat gun or an ordinary hair dryer.

1. Heat the edge of the back cover by running the hot air device evenly over it.

To create a narrow gap between back cover and display unit you need a flat, stable tool. We recommend the iFlex for this, since it has particularly sharp edges that can be easily inserted.

1. Attach a suction cup to the lower edge of the back cover and pull it upwards. Insert the iFlex between the display unit and the back cover at the same time.

The back cover is glued separately around the camera module. Be especially careful when removing the back cover at this point to avoid damaging the camera module with your tool.

To avoid damaging the edge of the case with the sharp edges of the iFlex, you should switch to a plastic tool like the iPlastix as soon as possible.

1. Drive the tool completely around the edge of the back cover to loosen it piece by piece.
2. Slide flat picks under the back cover at regular intervals, so that the glue cannot bond again.

1. Once the back cover is completely detached, you first have to remove all plastic picks.
2. Then unfold it and put it aside.

• 11 × 3.9 mm Phillips

Use a screw storage to keep an overview during the repair and avoid losing anything. Use an old sewing box, for example. With our high-quality magnetic pad, you have the additional advantage that nothing slips.

1. Loosen the eleven Phillips screws from the plastic cover above the motherboard.
2. Then put them on your magnetic pad.

The camera module is embedded in the plastic cover. To avoid detaching it accidentally, you should hold it in place with your finger when removing the cover.

1. Carefully lever the plastic cover upwards, so that the lugs that hook it into the screen unit are released. We use a plastic spudger for this.
2. Take the detached plastic cover out of the device and put it aside.

• Connector

Always detach the battery connector as soon as possible to avoid a potential short circuit.

When separating connectors, always start from the side where there are no small components on the motherboard. This way you avoid potential damage.

1. Carefully pry the battery connector from the motherboard with a plastic spudger.

• Connector

Now also separate the connector of the orange fingerprint sensor, which is located right next to the battery connector on the motherboard.

• 7 × 3.9 mm Phillips

1. Remove the sieben Phillips screws from the speaker module.
2. Then place them on the magnetic pad.

1. Carefully lever the detached speaker out of the screen unit with a spudger.
2. Then take it out of the device and put it aside.

• Connector

1. Separate the two connectors of the connecting cable from the USB and motherboard each.

1. Take the separated connecting cable out of your device and put it aside.

The battery is fixed in the screen unit with a continuous thin adhesive film, on the underside of which are the actual adhesive surfaces. The three tabs of the adhesive film rest on the upper side of the battery.

1. First, remove the three adhesive tabs from the top of the battery. The labeling of the tabs indicates the order.

If an adhesive tab tears, simply pull the opposite white tab. Otherwise, you can also use a battery spudger to carefully lever the battery out of its guide.

1. Release the battery by gently pulling the adhesive tab with the A imprint and lift it out of its guide.

The back of the replacement battery already has an adhesive film, integrated on its back. Therefore you have to remove the old adhesive film from the bottom of the screen unit before you install the new battery.

To remove the battery's adhesive film from the screen unit without leaving any residue you should first heat it with hot air.

1. Heat the adhesive film by running a hot air device evenly over it.
2. Then use a sturdy, flat tool, such as a steel spatula, to drive underneath the adhesive film to remove it piece by piece from the bottom of the screen unit.

You may have to bend the connector of the replacement battery to ensure that it can be properly attached. Align it with the help of the connector slot of on the motherboard.

1. Carefully bend the connector of the replacement battery before installing it.
2. Then remove the protective foils from the battery's front and back.

We have reused the old battery for this photo tutorial.

1. Insert the prepared replacement battery into the screen unit and press it firmly.

The label on the connecting cable will help you to align it.

1. Position the connecting cable in the device again.
2. Attach its two connectors to the main and USB board respectively by gently pressing them down. You should hear and feel them click into place.

There are small lugs on the edge of the speaker module. These must fit into the screen unit to ensure that the speaker sits level.

1. Put the speaker back in its original position.

• 7 × 3.9 mm Phillips

Make sure the speaker sits level in the device before you screw it in.

1. Screw the speaker into place with the seven Phillips screws.

• Connector

1. Reconnect the fingerprint sensor by carefully pressing it onto the motherboard. You should hear and feel it click into place.

• Connector

Always connect the battery connector last to avoid a potential short circuit.

1. You can now also reattach the orange battery connector to the motherboard.

There are a few lugs on the edge of the plastic cover. In order for the cover to sit evenly, all lugs have to fit into the casing's edge. For this, it is best to place the cover on the upper edge of the display unit.

1. Reinstall the plastic cover over the motherboard.

• 11 × 3.9 mm Phillips

Make sure the plastic cover sits level in the device before you screw it in.

1. Screw the plastic cover tight with the eleven Phillips screws.

If something doesn't work properly during testing, double-check that everything is installed and attached correctly.

1. Connect your Poco to the mains in order to check the functionality of the replacement battery.
2. If available, place it on a wireless charger to check the function of the NFC antenna as well.
3. To test other components, you can use our checklist as a guide.

Attaching a new adhesive frame is optional. If it is still in good condition, you do not need to install a new one. However, if it has defects or no longer sticks properly, we recommend that you install a new adhesive frame.

If the old adhesive frame forms lumps in some places, you should remove them, so that the back cover lies flat again and seals your smartphone properly.

1. We show you how to apply a new adhesive frame in detail in our YouTube video on the example of the iphone 12.

We recommend that you run hot air over the edge of the back cover again, so that the glue bonds properly. You can also weigh down your device with books for a few minutes or clamp it like in our example.

1. Close your Xiaomi Poco X3 NFC after the repair by pressing the back cover back onto the screen unit.