Xiaomi Redmi 4X has proven to be a reliable device with an excellent metal body and long work on a single charge. However, over time, any lithium-ion power source degrades, losing capacity, leading to rapid discharge and unexpected shutdowns. If your device stops holding charge or turns off with 20-30% of the battery, it’s time to think about replacing the battery.
The recovery procedure does not require any engineering training, but it does require basic skills in small electronics and accuracy. The most common cause of battery bloating in this model is the use of non-original chargers with unstable current. In this article, we will discuss in detail the process of dismantling an old part and installing a new one, so that your gadget will again enjoy autonomy.
Before you start, it’s important to understand that opening the case automatically deprives you of an official warranty if it was still in effect. The Redmi 4X features a non-removable rear cover that is attached to adhesives and screws hidden under decorative plugs. You’ll need patience and good light to avoid damaging the plumes or screen when disassembling.
Tools and workplace preparation required
A good repair starts with the right organization of the space. You'll need a clean, well-lit surface, preferably with an antistatic mat, although at home you'll find a regular table with a cloth without a pile. To work with small screws and fragile components, it's critical to have a full set of tools on hand in advance so as not to interrupt the search process.
The main tool will be a set of screwdrivers, including a cross (Phillips #000 or #00) for the screws of the case and possibly flat for careful fitting of plugs, and an indispensable assistant will be a plastic blade (mediator) or an old plastic card that will not scratch the metal and will not damage the screen when the lid is peeled off.
Don't forget to use a dryer or temperature-adjusted building dryer to soften the glue. If the dryer isn't there, some wizards use hot but non-boiling water heating, but this method is less accurate and can lead to moisture. Tweezers with curved ends can be useful to extract screws from hard-to-reach places.
- 🔧 A set of precision screwdrivers (cross and flat)
- 🔥 Hair dryer
- 📱 Plastic blade or mediator for opening
- 🧲 Magnetic substrate for sorting screws
- 🧪 New battery with adhesive base or bilateral scotch
Preparing the workplace also involves turning off all appliances that may cause interference and removing metal jewelry from your hands so you don't accidentally close contacts on the motherboard. Remember that static electricity can disable electronics, so it's recommended to periodically touch the grounded metal object.
Removal of the back cover and removal of protective elements
The process of dismantling the Xiaomi Redmi 4X begins with a careful inspection of the ends of the device. On the lower end, next to the charging connector, you will find two small plugs hiding the fasteners. Carefully tuck them with a thin screwdriver sting or needle to access the main frame screws.
After twisting five screws (two at the bottom and three at the perimeter, if you have them in your revision), take your time to pull the lid. It is tightly glued around the perimeter. Turn the hair dryer on at average temperature and evenly warm the edges of the body for 2-3 minutes, constantly moving the flow of air so as not to overheat the display matrix.
⚠️ Do not send hot air to one point for longer 5-10 seconds, otherwise the glue inside can melt and leak onto the components, and the screen gets thermal damage.
When the case is slightly heated, insert a plastic blade into the joint between the frame and the cover in the area of the charging connector. Slowly guide the tool along the perimeter, feeling the adhesive peeling off. If you feel strong resistance, heat the problem area again with a hairdryer without using excessive force.
Once you successfully remove the lid, you'll see an interior space with a black plastic frame covering the battery and the plumes, and this frame is also attached to the screws, and the number of screws can vary, but they're usually around. 10-12 You twist them all out and put them in a magnetic organizer, keeping order, because screws can have different lengths.
When you remove the plastic lining, you will see the battery closed with another layer of protection or a sticker with information. At this stage, it is important to be extremely careful with the plume connecting the main board to the bottom (where the charging connector and speaker are located), as it passes under the battery or next to it.
☑️ Check before removing the battery
Removing the old battery and preparing the niche
The most critical thing is to disconnect the old battery. The battery plume in the Redmi 4X is connected to the lower board or motherboard (depending on the modification) through the connector. Under no circumstances pull the battery until you turn off the connector. Use a plastic blade or nail to gently lift the connector up.
The battery in this model is planted on a rather powerful layer of glue, and simply trying to pull it out can deform a new part, or worse, break down and ignite an old one. There are two main methods of extraction: using a suction cup and heating, or applying a solvent.
If you use the heating method, gently walk again with a hairdryer on the back of the case in the battery area (if it is still inside) or on the battery itself if the lid is removed. Try not to warm the center where the chemistry is, warm the edges. After warming up, you can try to tamper with the edge of the battery with a plastic map and, swaying from side to side, separate it from the frame.
The second method is safer for the integrity of the elements, but it takes time: put a little isopropyl alcohol (not water or acetone!) under the edge of the battery. The liquid will penetrate the adhesive layer and dissolve it, after which the battery will easily separate. After removing the old part, carefully clean the niche of glue and dirt residue.
- 🧪 Use isopropyl alcohol to dissolve glue
- 🌡️ Do not heat the battery higher 60-70 degrees Celsius
- 🚫 It is strictly forbidden to pierce the battery body
- ♻️ Remove the old item according to safety rules
Cleaning the seat is a must. The new battery should lie on a perfectly flat and clean surface. If you leave the bumps of old glue, the new battery can swell faster due to uneven pressure or poor heat sink. Rub the surface with a soft lilac-free napkin moistened with alcohol.
What to do if the old battery is swelling?
Installation of a new battery and assembly of the device
Before installing a new battery, make sure that its model fully meets the specifications of Xiaomi Redmi 4X. The original capacity is 4100 mAh. The use of cheap analogues with overstated performance often leads to unstable system operation and rapid degradation.
Stick double-sided tape or use a pre-prepared adhesive base on a new battery. Don't apply liquid glue directly to the battery or inside the case, because the next time you replace it, it will create huge problems, and the adhesive fumes can damage the electronics. Carefully insert the battery into the niche and press it tightly throughout the area.
Put the battery plume on the connector. You should hear a slight click confirming that the connector has stopped. Now, before you twist the screws of the frame, it makes sense to check the performance. Without sticking the lid, press the switch on. If the screen caught fire and the phone started charging, you did it.
The assembly is done in reverse order. Set the plastic frame, making sure that all the plumes are in their channels and not clamped. Twisted all the screws of the frame. Then apply a new layer of glue (B-7000 or special adhesive for screens) around the perimeter of the case or use a ready-made adhesive frame.
| Work segment | Tool. | Implementation time | Difficulty |
|---|---|---|---|
| Disassembly of the hull | Fen, spatula | 10-15 minutes | Medium |
| Removal of the framework | Screwdriver cross | 5 minutes | Low. |
| Battery replacement | Scapula, alcohol | 10 minutes | Tall. |
| Final assembly | Glue, screwdriver. | 15-20 minutes | Low. |
When you install the back cover, press it hard around the perimeter and if you use liquid glue, lock the device with rubber rings or a load for 1-2 hours until it is completely dry. Don't turn on the phone immediately if you used a liquid adhesive, give it time to polymerize.
Primary calibration and system configuration
After successful replacement and first activation, the system may not display the charge level correctly, since the power controller still "remembers" the parameters of the old battery. To work correctly, you need to conduct a calibration procedure, this is especially true if the phone was turned off at 15-20% charge before repair.
Discharge the phone until it's completely turned off. Then charge it when it's off until it reaches 100%. Once the indicator shows full charge, don't take the cable out for another 1-2 hours, so the controller can record the current capacity values.
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Special Google Play apps can be used for more precise calibration, but Redmi 4X often requires one full discharge-charge cycle when off.
In some cases, you may need to reset battery statistics through the engineering menu ##6485##. In the menu, find the parameters. MB_06 (the state of battery health; and MF_02 (If the values look correct, the system will update them after several cycles.
Pay attention to the temperature of the device during the first charge. It is normal to heat up to 35-40 degrees. If the phone gets hot, check if the battery fits tightly and if the plume is compressed. Also make sure you use a quality cable and power supply.
⚠️ Warning: If the phone reboots cyclically after the replacement or doesn't see charging, check the battery connector.
Typical errors and troubleshooting
Even following the instructions, beginners can encounter problems. One of the common mistakes is to damage the main board plume when the frame is not removed neatly. If the sensor or screen does not work after assembly, recheck all the plume connections. They must be snapped to the characteristic click.
Another problem is a dead phone after assembly, which often means you forgot to plug in the battery connector or hooked it up a curve, take it apart again and check the contact, and check the integrity of the battery plume itself, which is easy to tear when it is untidyly removed.
- 🔍 Phone does not turn on: check the connection of the battery plume
- 📉 Fast discharge: Calibrate or check background processes
- 📶 Bad Signal: Make sure the antenna cable is connected to the board
- 🔊 No sound: check the plume of the lower board (dynamics)
If you notice that a new battery is warming even in a simple one, it may indicate a defect in the part itself or a short circuit in the power supply chain, in which case use of the device must be stopped until the cause is determined, the quality of the components being replaced directly affects safety.
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The main cause of problems after replacement is not the battery itself, but loosely connected plumes or forgotten screws that close contacts on the board.
Sometimes users complain that the lid is not tightly fitting, which happens if the screws of the frame are not fully twisted or if a layer of glue is too thick, make sure that all screws are twisted evenly, without distortion.