How to remove the battery on Xiaomi: a complete guide to replacing

Owners of Xiaomi, Redmi and POCO smartphones often face the inevitable aging of lithium-ion batteries, which manifests itself in rapid discharge or sudden shutdowns of the device. Replacing the battery is one of the most effective ways to extend the life of the gadget, but modern manufacturers are doing everything possible to make it difficult to access internal components. If your phone stopped holding charge during the working day, it may be time to think about self-repair or preparing for a visit to the service.

The process of battery extraction in the Chinese brand devices has its own unique features that are radically different from the old models with removable covers. glue base, high-density plumes and fragile glass panels require the master to limit concentration and have a specialized tool. Wrong actions can lead not only to damage a new part, but also to the failure of the display or motherboard, so it is important to study the theoretical part before starting practical manipulations.

In this article, we will discuss in detail how to remove the battery on Xiaomi of various series, what tools will be needed to safely open the case and what nuances should be paid special attention. You will learn about methods of heating the glue, correct disconnection of plumes and critical safety measures that beginners ignore. Never try to remove the bloated battery mechanically without first neutralizing - this can cause a chemical reaction or fire.

Diagnosis of battery condition and signs of wear

Before disassembling the device, make sure that the problem is the physical wear of the energy element, not software failures or background processes. Lithium degradation is a natural process that occurs after 300-500 full charge-discharge cycles, which usually corresponds to 1.5-2 years of active use. Understanding the symptoms will help avoid unnecessary interference with the device if the problem can be solved by software calibration.

One of the most obvious signs is the bloating of the body, when the battery increases in volume and begins to press on the display or back cover. In such cases, the screen may detach at the bottom, and the touchscreen will appear iridescent spots or stripes indicating mechanical (pressure) on the matrix. Ignoring this symptom is dangerous, because the damaged shell of the battery can lead to a short circuit.

For more accurate diagnosis, you can use built-in engineering codes or third-party utilities that show the real capacity and number of recharge cycles. Enter the code in the dial menu ##6485##, to get into the Battery Info menu where the option MB_06 The health of the battery is shown, and MF_02 — If the numbers are significantly lower than the nominal, replacement is inevitable.

• 🔋 The smartphone turns off when charged 15-20%, previously worked before 5%.
• 🔋 The back cover or screen is noticeably bulging, violating the geometry of the body.
• 🔋 The device is very hot in the area of the camera even when idle.
• 🔋 Charging occurs in jerks or the phone does not turn on without connecting to the network.

⚠️ Warning: If you find that the battery is very swelled and deformed the body, in no case pierce it and do not try to force it back.

Software-based "treatment" methods, such as resetting or flashing, are ineffective in the event of physical wear and tear, and can only temporarily mask the problem. The power controller on the board may misread the voltage of the old battery, which leads to chaotic behavior of the system. So if the diagnosis confirms wear and tear, the best solution is to physically replace the component.

Tools and workplace preparation required

Qualitative replacement of the battery is impossible without proper tools, as an attempt to open a modern smartphone with improvised means (knife, scissors) is guaranteed to lead to damage. You will need a set of precision screwdrivers, as screws in Xiaomi can be of different sizes and types, including rare Torx stars. The lack of a suitable bit will lead to the merging of the faces, after which it will be extremely difficult to unscrew the screw.

To work with the adhesive base, which holds the battery and the back panel, you need a heat source. Professionals use temperature-adjusted thermophens, but at home, a quality phone warmer or even a neatly heated iron (through several layers of fabric) is suitable. The main thing is not to overheat the device above. 80-90 degrees so as not to damage OLED-matrix or polymer elements inside.

Special attention should be paid to the tools for peeling off. Plastic mediators, suckers and thin metal blades (with insulated edges) are mandatory. Metal tools should be used with extreme caution to not damage the plumes or break through the battery itself, which can be dangerous.

Also, be sure to prepare the screw sorting capacity, as Xiaomi smartphones use different lengths of screws to mount the board, speaker and frames. By confusing them, you can accidentally punch the motherboard with a too long screw, which will lead to expensive repairs.

The order of disassembly of the smartphone Xiaomi

The disassembly process begins with the removal of the tray SIM-This allows you to access hidden screws in some models and reduces the internal pressure when heated, then you need to warm the perimeter of the back cover or display (depending on the design) to a temperature of about 80°C during 2-3 The glue should soften but not boil, so it's important to keep the temperature up.

Using a suction cup, create a small gap between the frame and the lid, then gently insert a plastic mediator. Drive the tool along the perimeter, trying not to sink it deep so as not to damage the tail of the side button or antenna wires. In models with a glass back cover, the risk of chipping is very high, so the movements should be smooth and without jerking.

Once you remove the lid, you'll have access to the insides, but don't rush, and the first thing you need to do is disconnect the battery plume from the motherboard to turn the device off, and then you can unscrew the protective plates that cover the main connectors of the display and other modules.

• 🔧 Unscrew all visible screws of the lower edge (near the charging connector).
• 🔧 Carefully disconnect the antenna wire if it interferes with access to the board.
• 🔧 Remove the plastic speaker cover, which often covers the bottom of the battery.
• 🔧 Turn off the battery connector before any manipulation of the charge.

⚠️ Note: In some Redmi Note models, the main camera plume can run over the battery. Don't pull it sharply to avoid breaking thin tracks, first learn the wiring scheme for your particular model.

Further disassembly depends on the specific model, but the general principle remains the same: maximum care with fragile elements.Modular design of modern smartphones allows you to replace the battery without completely dismantling the board, but requires care when working with adhesive screeds.

Technology of retrieval of old battery

The most difficult step is to separate the battery from the frame, as it is glued over the entire area with double-sided tape. Trying to pull the battery behind the tongue (if any) often leads to rupture of the battery housing. For safe extraction, it is recommended to use the "string" method: skip a thin fishing line or dental floss over the edge of the battery and cut the glue layer with sawing movements.

If the thread doesn't work, you can use special adhesive solvents (e.g., B-7000 in liquid form or isopropyl alcohol) by dripping a few drops under the edge of the battery. You won't have to wait long, about 1-2 minutes, until the liquid penetrates deep and weakens the adhesion. After that, the battery should move away with minimal force.

You can't use metal blades to force the battery, because a puncture of the shell guarantees failure and potential fire. If the battery is sitting dead, it's better to add heat (carefully warming the back of the phone) or solvent than risk it.

Once the old battery is removed, be sure to clear the seat of the residue of the old glue.The surface should be smooth and clean so that the new battery lays flat and does not swell due to air pockets or pressure.Use a soft fabric moistened with alcohol for the final wipe.

Installation of a new battery and assembly of the device

Before installing a new battery, check its voltage with a multimeter; the optimal value is in the range of 3.7-3.8 Volts. If the voltage is below 3.5 V, it is advisable to recharge the battery before installation, using a laboratory power supply or a special activator so that the phone controller correctly recognizes the new element.

To fix the new battery, use a special double-sided battery tape (usually complete with quality spare parts) or apply a thin layer of B-7000 glue around the perimeter. Do not glue the center of the battery, as when heated or bloated, this can cause the case to rupture.

The reverse order of assembly is done: first, the battery plume is connected, then the protective plates are installed and the screws are screwed. It is important not to drag the screws, especially those that fasten the board, so as not to damage the textolite. Once the plume is connected, you can check the device's operability without finally putting the lid together.

• 🔌 Connect the battery plume before clicking, make sure to tight contact.
• 🔌 Install all shielding plates in their places.
• 🔌 Turn on your phone and check the reaction to the charger.
• 🔌 Only after a successful test, apply glue to the frame and glue the lid.

The final sealing of the case requires uniform application of glue around the perimeter of the frame. Once the lid is pressed, the device is best placed under the press or tightly wrapped with rubber bands for 1-2 hours to polymerize the glue, which will ensure the preservation of moisture protection (if it was claimed) and neat appearance.

Calibration and primary charging

After a successful battery replacement, you need to calibrate the power controller to correctly display the percentage of charge. Without this procedure, the phone can show 100% and turn off abruptly or hold on to 1% for a long time. The process is simple: discharge the phone until it is completely turned off, then charge it when it is off to 100%.

After reaching 100%, keep the device on charge for another 1-2 hours, then turn it on. If the indicator shows less than 100%, re-connect the charge. Repeat the cycle until after switching on immediately 100% lights up, which will help the system to re-determine the capacitance characteristics of the new battery.

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Use an original or certified charger in the first days after replacement. Rapid charging with powerful units can cause a new element to overheat if the adhesive layer has not yet fully grasped or there are micro-defects of contact.

In the early days of operation, monitor the temperature of the device heating. A warm case is considered normal when charging quickly, but if the phone gets hot, this may indicate problems with the controller or the quality of the battery itself, in which case the replacement should be repeated using parts from another manufacturer.

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A high-quality battery replacement is able to return the Xiaomi smartphone 80-90% of its original autonomy, making the device relevant for another 1-2 years of active operation.