Smartphone Xiaomi Redmi 4X deservedly considered one of the most reliable models in the budget segment, but even the legendary endurance eventually comes to an end. After two or three years of active operation, the battery capacity begins to fall rapidly, the device stops holding charge during the day, and in the worst case – turns off in the cold or at 30-40% charge. If you encounter such a problem, the only effective solution will be a physical replacement of the battery, as software methods will not help.
The battery extraction process in this model has its own unique features, which distinguish it from most modern monolithic smartphones. The main difficulty is the design of the case: the rear panel here is non-removable and glued around the perimeter, which requires accuracy and the presence of specific tools for opening without damage. Unlike the old models with removable covers, you can not just nail corners, because this will lead to cracks in the glass or plastic.
In this guide, we will take a detailed look at each stage of disassembly, from the preparation of the workplace to the final assembly of the device, you will learn what tools you will need, how to safely unplug the plumes and how to unplug the old battery so as not to damage the display or motherboard.
Tools and workplace preparation required
Before starting to disassemble the Redmi 4X, you need to organize a safe and well-lit workspace. You need a clean desk without pile and dust, since the internal components of the smartphone are extremely sensitive to contamination. The ideal option would be to use an antistatic mat, but at home you can do with clean cotton fabric.
To carry out a high-quality battery replacement, you will need the following set of tools:
- 🔧 Plastic blade (mediator) for opening the body without scratches.
- 🌡️ A hair dryer or thermophen to soften the glue under the back cover.
- 🔩 Sets of screwdrivers (cross Phillips #000 and flat).
- 🧲 Magnetic mat or screw sorting container.
- 🧴 Isopropyl alcohol or special liquid B-7000 glue-residue.
The heating element should be given special attention. Using a household hair dryer can take too long, so it is better to use a temperature-adjusted building hair dryer or a special heating pad for smartphones. The heating temperature should not exceed 80-90 degrees Celsius, so as not to damage the display module, which will also heat up in the process.
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Use the suction cup together with the shoulder blade: the suction cup creates initial tension, allowing easier insertion of the mediator into the junction of the body.
Removal of the back cover and primary disassembly
The first step is to carefully remove the back panel, which is held on a two-part adhesive. Heat the perimeter of the device evenly, paying special attention to the angles and long sides of the body. Do not hold the hair dryer too close to the surface to avoid local overheating, which can lead to detachment of the polarizing film of the display or bloating of the battery itself.
Once the body is warmed, insert a thin plastic blade or a special blade into the joint between the frame and the back cover. Move the tool along the perimeter, gradually cutting through the adhesive layer. It is important to act slowly and feel resistance: if the lid does not respond, then the glue in this place is not warmed up, and you need to add heat. Sharp movements can lead to chips on the faces.
⚠️ Warning: Never use metal knives or razor blades to lick the lid. Metal can damage plumes located under the frame, or penetrate the battery case, which will cause a fire.
When the lid is removed, you will see the inside of the smartphone. The first thing you need to do is to unscrew the screws that fix the plastic protective panel that covers the motherboard and the plumes. Xiaomi Redmi 4X usually uses about 10-12 screws of different lengths, so it is extremely important to remember or fix their location.
☑️ Preparation for autopsy
Disconnection of plumes and dismantling of components
Once the protective metal or plastic plate is removed, the main modules are accessed. Before any manipulations inside the case, the battery must be disconnected from the motherboard. The battery plume in the Redmi 4X is connected by a connector, which is often closed with an additional insulating tape or plastic lock.
Carefully remove the lock if you have one, and snap the connector with a plastic blade from the bottom up. Don't pull the wires as they are very thin and easily break. Once the power is turned off, other components that may interfere with battery access, such as the main camera module or speaker, can be safely removed if the design requires them to be removed.
In some cases, the battery may be further fixed with screws or plastic tongues. Carefully inspect the battery perimeter. If there are no screws, then the battery is only supported by the adhesive base applied by the manufacturer. To continue working, you will need to remove the speaker and vibrator, which often block access to the bottom of the battery.
| Component | Type of attachment | Tool. | Risk of damage |
|---|---|---|---|
| Back cover. | Clay. | Fen, spatula | Tall (cracks) |
| Protective plate. | Screws (Torx/Phillips) | Screwdriver. | Low. |
| Battery plume | Connector | Plastic. | Middle (cliff) |
| Dynamician | Screws + plume | Screwdriver. | Medium. |
Removal of the old battery
The most important thing is to remove the battery itself. In the Redmi 4X, the battery is glued to the display frame quite firmly. You can't just pull the tongue (if you have one) or the edges, because the battery body is soft and easily deforms, which can lead to short circuits.
There are two main ways of removing: mechanical and chemical. Mechanical involves the use of a thin fishing line or dental floss, which is wound behind the battery and cut glue with sawing movements. This method is effective, but requires caution not to cut the plume of the display passing under the battery. Chemical method involves the introduction of a solvent (alcohol or special glue) under the battery through a syringe with a thin needle.
Put some liquid under the edges of the battery and wait 2-3 minutes. The glue should soften. After that, gently niggle the battery with a spatula, starting at the bottom edge, where the connector is usually located. Move gradually without putting too much effort. If you feel strong resistance, add another solvent.
⚠️ Warning: If the battery is swelling, treat it with extreme caution. A puncture of the swelling battery will cause instant lithium ignition. Do not squeeze or heat the damaged element.
What to do if the battery does not detach?
Installation of a new power supply and assembly
Before installing a new battery, you need to carefully clean the seat of the residue of old glue. Use isopropyl alcohol and a plastic card or shoulder blade. The surface must be smooth and fat-free so that the new bilateral tape or B-7000 glue is perfectly flat. Unevenness can cause the battery to fit loosely, which can overheat.
Stick strips of double-sided tape onto the new battery (usually bundled with a new battery) or apply a thin layer of glue around the perimeter. Carefully frame the battery by matching the connector with the contacts on the board. Don't insert the connector to the end immediately - first make sure the battery is flat.
Once the battery is fixed, plug the plume into the characteristic click. Before you close the case with the protective plate and the back cover, you need to test it. Press the power button and make sure the smartphone responds, the screen saver MIUI appears on the screen, and the settings show the correct charge level.
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The quality of cleaning the seat from old glue directly affects the heat sink and the safety of the new battery.
Frequently Asked Questions (FAQ)
Can I replace the Redmi 4X battery without removing the display?
Which capacity is better to use a battery to replace?
How long does it take to replace the battery?
Do I need to calibrate a new battery?
Replacing the battery in the Xiaomi Redmi 4X is a real challenge for a home craftsman with minimal technical skills, and the key to doing so is taking your time, using the right tools, and following the right safety precautions. A well-designed replacement will give your smartphone back its autonomy and allow it to be used for a long time without being tied to a power outlet.