Xiaomi Redmi 4X, released in 2017, has proven to be a reliable budget device, but time does not spare lithium-ion batteries. Over time, the battery capacity drops, the device begins to quickly discharge or turn off in the cold, which inevitably leads the owner to the idea of replacing. Self-replacement of the battery is a real way to extend the life of the gadget without overpaying in the service center, if you approach it with due care and knowledge of design.
The process of extracting the power unit in this model has its own nuances related to the location of the plumes and the attachment of the back cover. The key point is to understand that the case of the smartphone is not built on screws, but on adhesive basis, which requires a special approach to heating and opening. Wrong actions can lead to damage to the display or rupture of the plume, so it is important to follow the algorithm clearly and use the appropriate tools.
In this guide, we will discuss in detail how to safely remove the battery, what tools you will need and what to pay special attention to when working with internal components of the Redmi 4X. You will learn about the specifics of disconnecting connectors and methods of safely removing old battery, which is often attached to double-sided tape. Preparation for repair begins long before the first screw, so pay attention to the theoretical part.
Tools and workplace preparation required
To do a good job, it's not enough to have a screwdriver; you need a specialty kit that minimizes the risk of damage to fragile components. The main enemy in dismantling is static electricity and physical force, applied in the wrong place. So organizing the workspace is the first step to success.
You'll need a dryer (construction or household at minimum power) to soften the glue under the back cover, a suction cup for tidy lifting of the lid, mediators or plastic blades to snap the latches, and use metal tools with extreme care so as not to damage the polymer battery or plumes.
⚠️ Warning: Before starting any work, be sure to completely turn off the smartphone. Attempting to turn off the plume under voltage can lead to a short circuit and failure of the power controller.
Be sure to prepare the screw folding container, as they can have different lengths and threads. Magnetic mat or ordinary white paper will help you not lose small details and see their contrast. Lack of dust and good lighting are also critical factors for the successful completion of the operation.
- 🛠️ Set of screwdrivers (cross-haired) PH000 or PH00) hull-rotor.
- 🔥 Hair dryer or heat-heating station for heating glue.
- 📱 Plastic mediators and a suction cup for opening the body.
- 🧲 Tweezers (preferably dielectric) for working with small parts.
Rear cover removal and protection process
The Redmi 4X is equipped with a metal body, but the back panel often has plastic inserts or is entirely made of metal with adhesive layer around the perimeter. Heat must be done evenly, paying special attention to the edges of the device. Do not overheat the center part where the screen is located, so as not to damage the matrix or adhesive connections of the display.
After warming up for 2-3 minutes, gently apply a suction cup at the bottom of the back cover and pull up to create a gap. Insert a plastic mediator into the resulting gap and, without undue effort, drive it along the perimeter of the housing. You will hear the characteristic clicks of the outgoing latches - this is the normal process of detaching plastic retainers.
When the lid is removed, you'll see an interior space that's covered with a black plastic lining, and this lining is fixed by a few screws that you need to unscrew, and underneath it is the top of the motherboard and, importantly for us, the battery connectors and the display.
☑️ Pre-mortem checks
Removing the safety pad requires care, as antenna contacts can pass underneath, bend or remove the plate carefully to gain free access to the motherboard screws and connectors, and now the path to the battery is almost open, but it is too early to rush to remove it.
Disconnection of plumes and access to the battery
The most critical step is power outage. In the Xiaomi Redmi 4X, the battery connector is located under a metal protective bar that is screwed to the frame of the smartphone. You'll need a small cross screwdriver to unscrew the 4-5 screws holding this bar.
Once you remove the metal, you'll see the plume connectors, and the battery is connected by a plug, which often has a safety plug or a lock, and you need to turn off the plume vertically, using a plastic blade or nail, but in no case pull the wires. A sharp jerk can break the thin tracks inside the plume.
⚠️ Note: It is strictly forbidden to use metal objects (needles, scissors) to turn off connectors under voltage or immediately after switching off, since the residual charge can cause micro-circuiting.
After the battery is turned off, it is also recommended to disconnect the display plume if the design requires more space for maneuver, although in the Redmi 4X you can often do without this.
Why is it important to turn off the battery first?
Now that the connector is free, you can move on to extracting the power cell itself, and it's attached to bilateral tape, which eventually loses its properties, but still holds the battery quite tightly, and you can't make sudden movements here.
Technology for Safe Removal of Old Battery
Removing a bloated or just old battery is a process that requires patience. In the Redmi 4X, the battery occupies a significant portion of the internal volume and fits tightly into the frame. Trying to tamper with a screwdriver from the edge often leads to deformation of the new battery body or, worse, to its puncture.
The best method is to use heat and thread. If you have a thin fishing line or a special string to open, run it under the battery and the sawing movements, cut the adhesive layer. Preheating the back of the smartphone (already without a lid) with a dryer at low temperature will help soften the glue.
Do not bend the battery or puncture the battery. Damage to the internal structure of the lithium polymer cell can cause instant ignition or the release of caustic smoke. If the battery is swelled, handle it with extreme caution, avoiding pressure on the center of bloating.
- 🌡️ Heat the battery area with a hairdryer during 1-2 minutes (temperature not more than one minute) 80°C).
- 🧵 Use a fishing line or plastic card to separate the glue from the frame.
- 🚫 Do not use metal blades to tweak from below.
- 👀 Visually monitor the integrity of the battery body during the process.
If you don't have any tools at hand, you can use a flat plastic card, carefully putting it under the battery. However, the thread method is considered more gentle for the body and the cell itself. Once the glue is defeated, remove the old battery and prepare a place for the new one.
Characteristics and selection of compatible battery
When buying a new battery for Xiaomi Redmi 4X (model BN20), it is important to pay attention not only to capacity, but also to the quality of execution and the availability of a protective board. The original batteries have a capacity of 4100 mAh, but there are many analogues on the market with overstated performance.
Pay attention to the date of production: lithium-ion chemicals age even on the shelf, so a battery that has lain for 3 years will have a reduced resource, QR-codes and high-quality printing on the case are indirect signs of originality, but the best guarantor is a proven supplier.
| Parameter | Original (BN20) | Quality analogue | Cheap copy |
|---|---|---|---|
| Capacity | 4100mAh | 3800-4000 mAh | 2500-3000 mAh |
| Weight. | ~95g | ~90-95g | ~70-80g |
| Protective fees | There's (quality) | There is. | Absent or primitive |
| Cycle resource | 500+ cycles | 300-400 cycles | 100-150 cycles |
Battery weight is an important indicator: batteries that are too light often have less real capacity due to the use of cheap materials.The protective board (BMS) inside the battery case is critical to prevent overcharging and deep discharge.
Before installing the new battery, it is advisable to recharge a little if it is discharged to zero, although modern controllers usually allow you to start the device immediately.
Smartphone assembly and initial launch
Install the new battery in reverse order. Gently glue the new battery to a double-sided tape (usually bundled with a new battery or bought separately). Don't skimp on glue, as an unsecured battery will hang around inside the case, which can cause the plume to break off when falling.
Connect the battery plume to the metal safety bar. Make sure the connector is up to the click and sits flat. Then screw the metallic lining with screws, keeping track of the length of each screw - twisting a long screw into a short hole can damage the board.
Before the final sealing of the case, it is recommended to perform a test run. Connect the battery, press the switch on and wait for the Mi logo to appear. If the phone is turned on, check the charging and operation of the touchscreen. Only when you make sure that you are working, you can fix the back cover.
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Use a special adhesive B-7000 or T-7000 to fix the back cover. Apply it with a thin layer around the perimeter, avoiding hitting the camera and speaker.
Final assembly includes heating the edges of the case for better adhesion of the glue and installation SIM-Let the glue dry for a few hours, putting the phone under a small load (for example, a stack of books), but do not overdo it with the pressure on the screen.
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High-quality battery fixation and tightness of the case is a guarantee that the smartphone will last a long time and will not get damage from dust or moisture.