Xiaomi Redmi Note 8 Pro deserved to be a bestseller thanks to its powerful processor and excellent camera, but time is not spared even the most reliable lithium-ion batteries. If your device began to quickly discharge, suddenly turn off at 20% charge or inflated, then it's time to think about replacing the power source, a procedure that can be done yourself, if you are careful and have a basic set of tools.
Unlike older models with removable covers, modern gadgets require a careful opening of the case, since the back panel is glued to a special sealant. The main difficulty is not to damage the glass back cover and not to break the plumes of the internal modules. However, with the right approach and lack of rush, you can return the phone to its former autonomy without going to the service center.
In this article, we will take a look at the whole process, from choosing a new battery to final assembly. You will learn what tools you will need, how to safely disable the plumes and what to pay special attention to not turn a minor repair into buying a new device. Note: a bloated battery is dangerous and can damage the display or body, so you can not drag with the replacement.
Diagnostics and selection of a new battery
Before disassembling, you need to make sure that the problem lies in the wear of the battery, and not in the software failure or malfunction of the power controller. Often users confuse rapid discharge due to "heavy" applications with physical degradation of the chemical composition. You can check the condition through the engineering menu or special utilities, but a physical examination will give the most accurate result.
When choosing a new battery for the Redmi Note 8 Pro, it is critical to avoid cheap, brandless counterparts.The original capacity is 4,500mAh, and any significant difference in the smaller side will indicate poor quality.The market is overrun with fakes that can not only lose capacity quickly, but also damage the motherboard with voltage surges.
- 🔋 Original: Xiaomi marking, hologram, exact 4500 mAh capacity match.
- ⚠️ Quality analogue: well-known brands like Nohon or Deji, the presence of a protective board.
- ❌ Counterfeit: lack of markings, light weight, bloating at the first charge.
Also, consider that the BN2 (battery code) has a form factor, and trying to cram a battery from another model can cause mechanical pressure on the display, which can cause purple spots or cracks on the matrix, so visual matching of size and location of the contact group is a must.
Tools and workplace preparation required
The success of the operation depends on preparation, 90%. You don't need a professional soldering table, but a minimum set of special tools is required. You should work on a clean, well-lit surface where nothing is lost. Small screws tend to roll into the most inaccessible places, so organize the space in advance.
The main tool is the heating element. The glue that glues the back cover only softens at about 80-90 degrees. Using an open flame or a too powerful hair dryer can damage the internal components or melt the plastic frame. A thermostol or a regular household hair dryer with temperature control is ideal.
☑️ Replacement toolkit
To turn off the plumes, you will need a plastic blade to avoid closing contacts on the board. Metal tools in this area are strictly prohibited, as this can short-circuit and fail the power controller. Also prepare a screw sorting tank, as they may differ in length and diameter of the thread.
⚠️ Warning: Before starting work, be sure to turn off your smartphone. Attempting to turn off the plume under voltage can cause the backlight of the display or charge controller to burn.
The process of heating and removing the back cover
The most critical stage, where the most breakdowns occur: the rear panel of the Xiaomi Redmi Note 8 Pro is made of glass, which bursts when a sharp temperature drop or mechanical impact. You need to heat evenly, driving a hairdryer around the perimeter of the device for 3-5 minutes. Do not hold the flow of hot air at one point for too long.
After heating, try to gently lift the edge of the lid in the area of the chamber or below with a suction cup. If the lid is difficult, do not pull the force, you better add a little more heat. The glue should become elastic. Insert a thin plastic mediator into the resulting gap and guide them along the perimeter, cutting the adhesive layer.
- 🔥 Heating: Warm the perimeter evenly, avoiding the center where the battery is located.
- 🧩 Autopsy: Use a suction cup and a mediator, moving from the edges to the center.
- 💎 Caution: glass is fragile, you can not make excessive efforts.
Be very careful in the top of the smartphone where the plumes are located. Do not open the lid completely until you make sure that there is no glue residue around the perimeter. A sharp jerk can break thin conductors going to the main board. It is better to be safe and pass the mediator a second time.
What to do if the lid is cracked?
Dismantling the protective plate and disconnecting the plumes
When you remove the lid, you'll see a metal plate covering the bottom of the body, and it's attached to a lot of small screws, and to avoid confusion, you'll want to put the screws in the same order you twisted them, or use a magnetic mat with a markup.
Under the plate are the plumes of the display, the touchscreen and the battery itself, and the first thing you need to do is turn off the battery connector, and that will turn off the device and make further manipulations safe, and then you can disconnect the other plumes if you need access to the lower board.
To turn off the plume, use a plastic blade. Push the connector upwards, avoiding lateral effort. The plumes in the Redmi Note 8 Pro are gentle enough, and it's very easy to damage the contact group. If the connector is sitting tight, you can sway it slightly from side to side, but without fanaticism.
| Component | Location. | Features of dismantling |
|---|---|---|
| Battery | Central part | Requires peeling, fixed to double-sided scotch |
| Display plume | Top of the pay | Very thin, easy to break with careless handling |
| Main plume | The bottom of the fee | Connects the main and child boards, requires accuracy |
| Camera module | Upper left corner | Often interferes with access, may require temporary withdrawal |
Removing the old battery and installing a new one
Xiaomi's battery is attached to a powerful two-way tape. You can't pull it out just like that, you can damage the shell, which will lead to fire. There are two main ways to extract it: mechanical (using a suction cup and a plastic card) and chemical (using isopropyl alcohol).
The safest method is to insert a thin plastic card or a special string under the battery, you can drip a little alcohol under the edges of the battery to dissolve the glue, move the card in a forward motion, gradually separating the battery from the case. Never use metal objects to tamper with the battery!
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The residues of old glue from the case are most conveniently removed by rolling them into the coils. To degrease the surface before sticking a new battery, use a lilaless napkin moistened with isopropyl alcohol.
The new battery is recommended to be warmed up a little before installation (not much, to 40-50 degrees) so that the adhesive layer on it becomes more sticky. Set the battery in the frame, press tightly and let cool. After that, you can plug the plume and check the smartphone's response to charging before the final assembly.
⚠️ Warning: If the new battery has a protective film on the contacts, be sure to remove it before installation. otherwise the device will not see the battery and will not charge.
Final assembly and performance check
Once successfully replaced and first switched on, you can start assembly. Make sure all screws are twisted but not pulled. Excessive force can break the thread in the plastic seats. The plumes should lie flat, without clamps or tension.
The back cover before the sticker needs to be cleaned from the residue of old glue to the perfect condition. Unless you plan to use a special glue B-7000, you can use ready-made gasket frames that come with quality batteries, which provide sufficient tightness and fixation.
- 🧹 Cleaning: Remove all old glue from the frame of the case.
- 🧪 Degreasing: Wipe the surface with alcohol for better adhesion.
- 🖐️ Fixing: after gluing the lid, put the phone under the press (book) on 1-2 hour.
The first run may take longer than usual, the system will calibrate the new battery, it is recommended to immediately charge the device and bring the charge to 100%, not turning on the screen, this will help the power controller correctly calculate the capacity of the new battery.
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Proper calibration of the new battery is the key to its long service. The first 2-3 cycles of charge-discharge are better spent in a gentle mode, avoiding full discharge to zero.