Modern Xiaomi smartphones, whether budget Redmi or Mi flagships, often delight users with fast charging and capacious batteries, but over time, even the highest quality lithium polymer drive loses its capacity. When the phone starts to turn off at 20% charge or the bloated battery deforms the body, the question arises about replacing. However, unlike older models with removable covers, modern devices require a careful opening, since the back panel is glued to a special sealant.
The process of replacing a battery requires not only technical skill, but also an understanding of the risks associated with leakage of the housing. Incorrect actions can damage the plumes, screen or even fire the battery when a mechanical puncture occurs, which is why it is important to clearly understand the sequence of actions and have the necessary tools at hand before starting to dismantle the components.
In this article, we will discuss in detail how to safely remove the battery from the Xiaomi phone, what nuances exist in different series of devices and what to pay special attention to not turn a simple upgrade into an expensive repair of the motherboard.
Tools and workplace preparation required
Before you start disassembling, you need to prepare the workspace, it needs to be well lit, and the surface is clean, smooth and preferably not conductive electric current. Ideally, an antistatic mat or just a wooden table covered with cloth. Static electricity can disable sensitive electronics, so do not neglect precautions.
To work, you will need a specialized set of tools that can be purchased from radio stores or ordered online.
- 🔥 A hair dryer or heating platform to soften the glue under the cover.
- 🔧 Set of screwdrivers (usually cross-shaped) P2, P5 Torx T2, T4).
- 🪒 Thin plastic mediators or a suction cup to open the body.
- 🧴 Fluid B-7000 or a special glue for subsequent assembly.
It is also important to prepare the screw containers, as Xiaomi smartphones use fasteners of different lengths. If you screw a long screw into the hole for a short one, you can damage the motherboard or the camera module. Never use metal blades to snap the lid next to the display - this is guaranteed to cause the backlight plume to break.
☑️ Ready for repair
Assessment of battery status and diagnosis
Before you disassemble the phone, make sure that the battery is the problem. Sometimes the quick discharge is caused by software failures or background processes. Check the battery usage statistics in the Settings menu. → Battery: If the discharge schedule is flat, but the phone turns off abruptly, it's a sign of chemical degradation.
Visual inspection can also provide a lot of information: If the back of the smartphone starts to move away on its own or the screen goes "wave", then the battery is swelling, in which case it is dangerous to operate the device, because pressure on the matrix can lead to its destruction, the billowing battery requires immediate replacement, and you can not drag it.
For more accurate diagnosis, you can use a hidden engineering menu MIUI. Enter the code ##6485## You're interested in the setting. MB_06 (battery status; and MB_00 (If the battery status is listed as "Good" but the phone is behaving strangely, it may be the power controller problem, not the bank itself.
What do the codes in the engineering menu mean?
The process of heating and removing the back cover
The most important step is to separate the back panel. In most Xiaomi and Redmi models, it is glued around the perimeter. To soften the glue, you need to warm the edges of the device evenly. Use a hair dryer at about 80-90 degrees, and warm the perimeter for 2-3 minutes. Don't hold the hair dryer too close so as not to overheat the matrix or battery.
After warming up, gently insert the suction cup at the bottom of the back cover, stepping away from the edge about 1 cm. Pull the suction cup up, creating a small gap, and immediately insert a thin plastic spatula into it. Drive the spatula along the perimeter, cutting the glue layer. Movements should be sliding, without sharp jerks.
⚠️ Warning: If you feel strong resistance, don't use force. The glue is probably not warmed up in this area. Reheat with a hair dryer, otherwise the plastic cover may crack and the glass cover may break into shrapnel.
Particular care should be taken in the area of the main camera module and the fingerprint scanner, if it is built into the cover. In some models, the scanner plume can be glued to the inside of the panel. Sharply pulling the cover, you risk tearing off the plume along with the connector on the board.
Disassembly of internal components and disconnection of plumes
Once the lid is successfully removed, you will see the internal layout, and in modern Xiaomi smartphones, battery access is often blocked by a plastic or metal protective plate that covers the motherboard and plumes, and this plate is attached to many screws of different sizes.
You need to unscrew all the visible screws that hold the protection, and when you remove the plate, you'll have access to the connectors, and the first thing you need to do is to disconnect the battery plume from the motherboard, and you should do this with a plastic blade or nail, gently putting the connector up, and you can't use metal tools to avoid short circuits.
Then the other plumes are turned off: the display, the cameras, the buttons. They are also desirable to be carefully disconnected so that nothing interferes with the recovery of the battery. Often the battery is held by additional strips of glue or screws at the bottom. The screws are twisted out, and the adhesive strips are neatly cut with a scalp or heat up with a hairdryer.
| Component | Type of attachment | Risk of damage | Tool. |
|---|---|---|---|
| Back cover. | Glue B-7000 | Tall (cracks) | Fryer, sucker. |
| Protective plate. | Screws (P2, Torx) | Medium (to tear the thread) | Screwdriver. |
| Battery plume | Clamp (connector) | High (contact break) | Plastic. |
| Battery | Double-sided scotch | Critical (puncture) | Thread, hair dryer |
Removing the old battery and installing a new one
The hardest part of the operation is extracting the battery itself. In Xiaomi phones, it's often put on very aggressive double-sided tape. It's rare to pull the tongue (if there is one), it breaks off. You can't use metal objects to tamper with it because of the risk of puncture and fire.
The best method is to use a thin fishing line or dental floss, thread the top edge of the battery and, as you make sawing movements from side to side, gradually descend, cutting the glue layer, which requires patience and can take 10-15 minutes.
After removing the old battery, you need to thoroughly clean the seat of glue residues. The surface should be perfectly smooth and fat-free. The new battery should be warmed up a little before installation with a hairdryer (up to 40-50 degrees) so that the adhesive layer becomes elastic. Then remove the protective film and gently glue the battery, pressing it heavily over the entire area.
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If there is no factory tape under the new battery, use special adhesive tapes for batteries or high-quality double-sided 3M Scotch. Conventional Scotch will not withstand heating and the battery will begin to dangle.
Assembly of the device and check of performance
The first thing you do is you plug the battery plume into the motherboard, make sure the connector is flat and snaps, and then you can plug the other plumes in and put the protective plate in, and you can twist the screws.
Before applying the glue to the back cover, make sure to check the phone's performance. Press the power button. If the screen catches fire and starts charging, it's a success. If the phone doesn't respond, double-check the density of the battery connector.
To fix the lid, apply a thin layer of B-7000 or T-7000 glue around the perimeter of the frame. Don't put glue inside the case! Press the lid and lock the device with money bands or a load for 1-2 hours until it is completely dry.
⚠️ Warning: Do not turn on the phone immediately after assembly if you have used a lot of glue.Let it be completely polymerized, otherwise the adhesive fumes may settle on the cameras and speakers, worsening their quality.
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The main secret of successful assembly is the purity of contacts and the absence of dust under the protective plates, which guarantees the absence of problems with the signal and touch screen.