Smartphone Xiaomi Redmi Note 5, also known under the code name whyred, deservedly considered one of the most successful models of the manufacturer. However, time spares even the most reliable lithium-polymer batteries, and after 3-4 years of active use, users often face rapid discharge and sudden shutdowns of the device. Unlike modern monolithic designs, where replacing the battery requires complex equipment, the design of this device allows you to replace at home with a minimum set of tools.
The process of extracting the power source requires accuracy and understanding of the physical properties of the adhesives used in assembly. The main difficulty is not the dismantling itself, but the safe compartment of the rear panel, which is glued around the perimeter of the housing. Wrong actions can damage the glass, plumes or, worse, puncture the battery itself, which is categorically unacceptable.
In this article, we will take a closer look at each step of the work, focusing on precautions and technical details of disassembly, learn how to prepare the workplace, what tools are needed and how to avoid the typical mistakes that beginners make when first familiarizing themselves with the internal device.
Before any manipulations begin, you need to completely de-energize the device. You don't have to discharge the smartphone to zero, you just need to turn it off through the software menu. Make sure that there are no metal objects on the desktop that can accidentally close contacts on the motherboard. It is also crucial to organize good lighting, since many elements inside the case are black and merge with dark plastic.
Tools and workplace preparation required
To successfully perform the procedure, you will need a specific set of tools that differ significantly from standard household remixes. Using inappropriate items such as knives or pins increases the risk of damage to internal components at times. Professional craftsmen use specialized tools that minimize mechanical impact on fragile elements.
The main tool for working with the body will be a suction cup or a special opener with a thin blade. If there is no suction cup, you can use a thin line or a guitar string, but this requires a certain skill. To unscrew the screws you will need screwdrivers with a cross sting, most often a PH00 or PH000 form factor.
- 🔧 Plastic blade (mediator) for snapping plumes and cover
- 🔥 Hair dryer or heating pad for softening factory glue
- 🧲 Magnetic mat or organizer for sorting screws
- 🧤 Thin rubber gloves to protect against static electricity
⚠️ Attention: Using a metal knife blade to jack the lid can result in a short circuit if you accidentally touch the battery contacts or plumes.Always use only plastic tools to work inside the housing.
Prepare a clean, flat surface covered with soft cloth or an antistatic mat. This will not only protect the smartphone screen from scratches during operation, but also prevent the loss of small screws that tend to bounce unpredictably to the sides. Make sure that there is a screw capacity in advance, since there are many of them in the design of the Redmi Note 5, and they are of different lengths.
Special attention should be paid to the heating source. Household hair dryer is quite suitable for softening the glue, but do not use an industrial dryer, as it can overheat the plastic and deform the body. The temperature of exposure should not exceed 80-90 degrees Celsius. Keep the tool at a distance of 3-5 centimeters from the surface of the phone.
☑️ Preparation for disassembly
Removal of the back cover and removal of protection
The first step is to carefully separate the back glass panel from the metal frame. The factory glue that locks the glass solidifies over time, but when exposed to heat, it becomes elastic. Warm the perimeter of the device evenly during the course of the process. 2-3 You can move the hair dryer around so you don't overheat one point, and then you can put the plastic card or the shoulder blade in the top corner of the device, where you normally have a connector. SIM-map.
Move the shoulder blade along the perimeter, cutting the glue layer. Don't try to open the lid with a jerk, it's guaranteed to crack. If the lid doesn't lend itself, warm up the problem area again. Once the glue is softened around the perimeter, gently lift the glass and put it in a safe place. A metal screen will open before you, covering the main components.
Metal protection is mounted to the frame with a lot of screws. The number can vary depending on the revision of the motherboard, but usually there are about 15-20 pieces. It is important to remember the location of each screw, because they can be of different lengths. Using a screw too long in the hole for a short one can damage the board on the back side.
Once you unscrew all the screws, the metal plate won't come off right away. It's held by plastic latches around the perimeter. Use a plastic blade to gently snap them off. Move around, gradually freeing the plate. Under this protection, there's a battery, a motherboard, and display plumes.
Nuances of the glue layer
Check the insides for dust and foreign objects. Metal sawdust inside the case is unacceptable. If you find dust, use a soft brush or pear to clean. Be careful to bend the plumes if they interfere with access to the battery mount screws, but try not to disconnect them unless absolutely necessary.
Disabling plumes and removing the battery
The most critical thing is to disconnect the battery from the motherboard. In the Xiaomi Redmi Note 5, the battery connector is under a metal protective plate that we've already removed, and the plume is pressed on top with a plastic slat or a metal bracket that is fixed by the screw or snapped.
Use a plastic blade to shut down. Metal tools are also undesirable here, as there is a risk of damaging the connector contacts or scratching the board, which may cause oxidation in the future. The movement should be directed from the bottom up or sideways, depending on the type of latch. Don't pull the wire itself, just behind the plastic connector.
The battery in this model is glued to the body with double-sided tape. It's not easy to pull it out, it holds tight. To extract it, you need to reheat it. Warm up the battery area through the open back of the case for 1-2 minutes. The glue will soften and the battery can be moved.
- 🔋 Carefully decorate the battery from the bottom edge with a plastic card
- 🔋 Do not use sharp objects to pick under the battery.
- 🔋 Avoid strong bending of the battery body
- 🔋 When retrieving, keep the battery horizontally.
⚠️ Attention: It is strictly forbidden to puncture the battery or try to bend it. Lithium polymer cells can instantly ignite or smoke if the shell is damaged. If the battery is swelled, you need to remove it with extreme caution, without pressing on the center of the bloating.
In some cases, tape holds very tightly, you can use a thin line or dental floss, you can use it under the battery and move it from side to side like a saw, and this allows you to cut the adhesive layer without damaging the battery itself or deforming the body, and this is considered the safest method for complex cases.
Once the adhesive layer has been overcome, remove the battery from the housing. Pay attention to the position of the plume and its orientation. If you plan to install the battery back (for example, for diagnostics), make sure that it does not run to zero during work. Use a dielectric bag to store it.
Comparison of original and compatible batteries
When replacing a battery, it's a question of choosing a new battery. The market offers a variety of options, from original parts to cheap ones. Understanding the difference between them will help avoid re-repair in a few months. Xiaomi's original batteries are labeled. BM47 specific QR-code.
| Characteristics | Original (OEM) | Quality analogue | Cheap copy |
|---|---|---|---|
| Capacity | 4,000mAh (real) | 3600-3800 mAh | 2500-3000 mAh |
| Cycle resource | 500+ cycles | 300-400 cycles | 100-150 cycles |
| Protection | Full BMS fee | Basic protection | Absent. |
| Price. | Tall. | Medium | Low. |
The original batteries are equipped with a full-fledged control board (BMS) that controls temperature, voltage and charge currents. Cheap analogues often lack this protection, which can lead to overheating of the device or even bloating of a new element in a short time.
Compatible batteries from well-known brands (like Nohon or Deji) often perform better than originals bought in dubious places; they can have slightly lower capacity, but honest, and work consistently for years. The main thing is to avoid outright counterfeit from the markets, which sells under the guise of the original for pennies.
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Buying a battery from a trusted store with a guarantee is more important than finding the “original” on Chinese sites without reviews.
Assembly of the device and checking leakage
The new battery is installed in reverse disassembly, first you need to degrease the seat in the case by removing the remnants of the old glue with an alcohol napkin, then you put strips of bilateral tape on the new battery. Don't glue the entire surface of the battery, 2-4 strips around the edges are enough to fix.
Connect the battery plume to the motherboard before you finally put the battery in place. Make sure the connector snaps with a characteristic light click. Then gently pack the battery into the niche, press it and check if it is above the frame level. If the battery is lying right, you can start installing metal protection.
As you twist the metal plate screws, you keep the sequence. Don't twist one screw to the end at once, you make all the screws first, and then gradually tighten them diagonally, which will ensure that the plate fits evenly and there are no distortions. Pay special attention to the screws in the corners.
Before you stick the back cover, make sure you check the smartphone's performance. Turn on the device, make sure it responds to charging, the sensor and the display are working. If everything is working properly, you can apply new glue. The Redmi Note 5 is ideal for adhesive bezels that are already shaped and thick.
- 🧹 Degrease the frame of the case with alcohol
- 🖐️ Remove the protective film with adhesive frame
- 🔒 Combine camera holes and speaker
- ⏳ Press the lid and lock with rubber bands for 15 minutes.
⚠️ Warning: Do not turn on your smartphone immediately after applying the glue if you use liquid formulations (B-7000). Let the glue grab at least. 10-15 It takes a full polymerization to 24 During which time it is better not to use the phone actively.
To fix the lid during drying of the glue, you can use stationery gums, stretching them across and along the body. Do not overdo it with tension so as not to damage the display. After 20-30 minutes, you can remove the rubber bands, but the body will acquire full tightness only in a day.
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To check the leakage after assembly, you can carefully (without fanaticism) blow into the speaker or microphone. If the air comes out of the slits, then the lid is not glued tightly or the glue is not grasped.
First start and calibration of the new battery
After successful assembly and initial activation, the system may not immediately correctly display the charge level. This is normal, since the power controller has not yet "acquainted" with the new element. To calibrate, it is recommended to discharge the smartphone before turning off, and then charge to 100% when turned off.
The calibration process helps the system correctly determine the percentage of charge and prevents sudden shutdowns at 15-20%. In modern versions of MIUI, this process takes place automatically in the background for several charge-discharge cycles, but manual calibration will accelerate this process.
Notice how the smartphone behaves in the early days, it shouldn't be idle. If you notice an abnormal heating in the battery area, it could indicate poor contact of the plume or a defect in the battery itself, in which case you'll have to repeat the procedure by checking the reliability of the connection.
You can use built-in diagnostics or third-party apps to monitor battery status. The Xiaomi engineering menu also provides information about current voltage and temperature. Enter the code ##6484## to enter the test mode and select the item associated with the battery.
Engineering menu
Compliance with all the recommendations will extend the life of your Redmi Note 5 for several more years. Self-replacement of the battery is not only a cost savings, but also a useful experience that will come in handy in the future.