Declining autonomy is an inevitable phase of life for any modern smartphone, and Xiaomi, Redmi or Poco devices are no exception. Over time, lithium-ion batteries lose their chemical capacity, stopping holding the charge as long as the first day after purchase. If your phone runs out in half a day or turns off at 20% charge, it's time to think about replacing the energy source.
Many users carry the gadget to the service center for fear of damaging fragile plumes or breaking the tightness of the case. However, replacing the battery with Xiaomi is a real task for a person with minimal technical skills and the right set of tools.
In this guide, we will look at all the steps of the process, from diagnosis and selection of quality parts to final assembly and calibration, you will learn what nuances different models have, how to safely unplug the back cover and why it is important not to overheat the device during operation.
Diagnosis of battery status and choice of spare part
Before you start disassembling, you need to make sure that the problem lies in the physical wear of the battery, and not in software failure or background processes. For quick checks, you can use embedded codes or third-party utilities ##6485##, to get into the engineering menu where the parameter MB_06 The health of the battery is shown, and MF_02 — full-cycle.
If the diagnosis confirms wear and tear, the next step is to find the right part.The market is oversaturated with low-quality copies that can swell or fail in a couple of months.The original Xiaomi batteries often have protective holograms and adhesives. QR-authentication codes on the manufacturer's official website.
⚠️ Warning: Never buy batteries without protective film on contacts and with signs of autopsy.Using poor-quality batteries can cause the device to overheat and even catch fire.
When choosing, consider the capacity specified in mAh (milliamp-hours) and it must strictly conform to the specifications of your model. Using a battery with a larger capacity than the design can lead to problems with closing the cap or overloading the power controller.
- 🔋 Highest reliability, exact fit, but high price and risk of running into a fake.
- 🏭 Quality copy (Nohon, Cameron Sino): Good value for money, often have overheating protection.
- 💸 Cheap Chinese Noname: High-Risk Lottery for Quick Failure and Declared Capacity Mismatch.
It's also important to consider the age of the part, because even if the battery is in storage, the chemical processes are still going on, and try to buy batteries that have been built for less than 1-2 years.
Tools and workplace preparation required
The success of the operation depends on preparation for 90%. You don't need a professional soldering table, but a minimum set of tools is required. Most Xiaomi models with a glass or plastic back cover will require a hair dryer to soften the adhesive. Metal cases of older models may require a screwdriver of specific shapes.
The workplace should be well lit and spacious. Prepare the screw containers in advance, as there can be many, and they often vary in length. By confusing the screws when assembled, you can damage the motherboard or the camera module.
☑️ Preparation for repairs
The core set of tools includes:
- 🌡️ Thermophen or building hair dryer: To heat the adhesive layer around the perimeter of the housing.
- 🛠️ Sets of screwdrivers: It is mandatory to have crosses (PH000, PH00) and sometimes asterisks (Torx).
- 🧩 Plastic blades and mediators: For careful snapping of the body without scratches.
- 🧲 Magnetic mat: To avoid losing tiny screws in the process.
It is also recommended to have a suction cup to lift the lid and tweezers with dielectric tips. If your model battery is glued to the body, you will need a special adhesive solvent or isopropyl alcohol.
The process of disassembling the Xiaomi smartphone
The disassembly procedure varies depending on the design of the case. In modern models with a glass back panel, the first step is always heating. Set the dryer at an average temperature and evenly warm the perimeter of the device for 2-3 minutes. Do not keep the hair dryer in one place for too long so as not to damage it. OLED-screen.
After heating, gently insert the suction cup into the bottom of the back cover and pull slightly, creating a gap. Insert a thin plastic blade or mediator into the resulting gap. Move the tool along the perimeter, cutting the softened glue. Sharp movements and jerks are prohibited - the glass may crack.
Nuances of disassembly of models with non-removable cover
When the lid is removed, you'll see the inside of the battery, and in most cases, the battery is blocked by a plastic or metal plate that also attaches to the screws, unscrew them, fold them into a separate cell, and remove the protection.
The critical step is to turn off the battery plume, before you touch any internal components, you need to turn off the device, find the battery connector on the motherboard, and gently disconnect it with a plastic blade, and then you can continue disassembling.
⚠️ Warning: Never puncturing the battery or bending it. Damage to the lithium polymer cell can cause the electrolyte to instantly ignite.
Removing the old and installing a new battery
The hardest part is removing the old battery. In Xiaomi smartphones, the battery is often fixed to double-sided tape throughout the area. You can't just pull the tongue - this can lead to deformation and fire. Use a hair dryer to warm up the back wall of the case in the battery area (through the open case or on the front side if the battery is available).
Use plastic cards or, in extreme cases, a thin line to extract it, run the line under the accumulator, making sawing movements to separate the adhesive layer. If the battery has special tongues for extraction (pull-tabs), pull them slowly and at a sharp angle, without pulling sharply.
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If the old battery is swelling, be very careful. Don't push it with tools. Better heat it up a little harder so the glue is softer, and remove the battery completely without damaging the shell.
Once removed, clean the seat of the old glue residues. The surface should be flat and clean. Place the new battery in the compartment, pre-applying a new layer of adhesive composition (usually complete with a new one). BPI-battery) or using double-sided scotch.
Connect the new battery plume to the motherboard. Make sure the connector is up before the click and locks. Don't turn the phone on right away -- check that all components are properly assembled first.
Assembly of the device and check of performance
The assembly is done in reverse disassembly. You put the protective plate over the battery and twist all the screws. Pay attention to the length of the screws: longer screws usually twist into corners or special metal sleeves. You can't twist the screws, you can rip the threads in the plastic case.
Before you stick the back cover, do the initial test. Press the power button. If the screen catches fire and the MI or Redmi logo comes on, the connection is successful. Check if the charging process is displayed when you connect the cable.
If the phone is turned on, apply a new glue (B-7000 or special glue for screens) around the perimeter of the frame with a thin strip. Press the back cover and lock the device with rubber bands for 15-20 minutes before the initial grasp of the glue.
| Phase | Action. | Important nuance |
|---|---|---|
| 1 | Heating the hull | Temperature not higher than 80-90 ° C, warm 2-3 minutes |
| 2 | Autopsy | Use a suction cup and mediator, do not press. |
| 3 | Shutdown | Remove the battery plume first |
| 4 | Replacement | Clean the glue, carefully insert a new one |
| 5 | Finals. | Checking the inclusion before gluing the cover |
After full assembly, it is recommended to calibrate the battery, completely discharge the phone before turning off, then charge it to 100%, leaving it for another hour or two, which will help the power controller to correctly display the charge level.
Frequent errors and security measures
One of the most common mistakes is ignoring safety practices when working with lithium cells. Short circuit of battery contacts with a metal tool can lead to instant thermal discharge. Always isolate the contacts of the extracted battery with tape.
Another mistake is to use aggressive solvents inside the case, the liquid can leak under the display or onto the board, causing corrosion, and to remove the glue, use a minimum amount of isopropyl alcohol and only on the cotton swab.
⚠️ Warning: If you smell smoke or smoke, stop working immediately, put the device in a safe place (preferably on a non-combustible surface) and ventilate the room.
Remember to use static electricity. Before starting work, it is advisable to touch a grounded metal object or use an antistatic bracelet, especially if the room is dry.