How to change the battery Xiaomi Redmi Note 3 Pro

Smartphone Xiaomi Redmi Note 3 Pro deservedly considered a legendary device in its price category, but time is ruthless to lithium-polymer batteries. After a few years of active use, owners often face a sharp drop in autonomy, sudden shutdowns at 20-30% charge or bloating. Replacing the battery in this case is the only effective way to return the gadget to its former mobility and performance.

The recovery procedure requires precision and understanding of the design, as the model is equipped with a non-removable battery integrated into the metal housing. Wrong actions can damage the plumes, screen or even fire damaged element. In this article, we will discuss in detail the steps of dismantling, connection and calibration of the new power system for your device.

Before you start physical intervention, you need to assess the status of the current power source, if you see a deformation of the back cover or a strong heating in the area of the chamber, you can not delay — these are signs of critical wear. A bloated battery can damage the display module from the inside, so its removal should be done with extreme care, without piercing the shell.

⚠️ Warning: If the battery is too swollen and glued to the frame, do not try to sharply tear it off.Heating and using plastic cards will help reduce the risk of rupture of the shell and electrolyte hit the board.

If you want to successfully perform a recovery operation, you'll need to prepare a workplace and specialized tools. Using inappropriate items like knives or metal blades can short circuits or scratch the internal components. Good tool preparation is the key to ensuring that you don't have any extra parts left after assembly.

• 🔧 Screwdriver kit: cross (PH000) flat-fibre.
• 💳 Plastic blades (spoogers) and a mediator for opening the housing without damage.
• 🌡️ Dryer or heat pad to soften battery-locking glue.
• 🧲 Magnetic mat or organizer for sorting screws of different sizes.
• 🧤 Antistatic gloves to protect electronics from static electricity.

Pay particular attention to the choice of the energy donor itself. The market is full of low-quality copies that can not only fail quickly, but also harm the power controller. The original BM32 capacity is 4000 mAh, and any significant deviations in the large direction without changing the dimensions should be suspicious.

Starting the demolition with removal SIM-And then you put the plastic card in the junction between the frame and the lid, and you twist the ten screws around the perimeter of the back cover, and then you gently insert the plastic card into the junction between the frame and the lid, as you go around the circle.

Don't put too much effort if the lid doesn't lend itself - you may have missed one of the screws or the glue hasn't yet warmed up.A light perimeter heater (no more than 60-70 degrees) will make the separation process much easier.The Redmi Note 3 Pro's metal frame is quite sturdy, but it can be bent if you handle the tool carelessly.

Once the lid is removed, you will have access to the insides, but it is too early to rush to remove the battery, and the first step is to disconnect the main connector plume from the motherboard to turn the device off, a critical step to prevent accidental short circuits when working with other components.

• 📱 Carefully bend the antenna plume if it interferes with access to the protection screws.
• 🔌 Disconnect the battery connector by slightly poking it up with a nail or plastic spatula.
• 🛡️ Remove the metal protective plate covering the main plumes of the display.
• 🧹 Remove dust from internal components with a soft brush before further work.

⚠️ Warning: Never pull the plumes with your fingers or tweezers. Connectors are disconnected by a strictly vertical upward movement so as not to damage the contact areas.

Now that the device is de-energized, you can move on to removing the old battery. In the Redmi Note 3 Pro, the battery is glued to a frame on double-sided tape, which eventually loses its properties but can hold very tightly. Put the edge of the battery with a spatula and slowly enter the card deeper, cutting the adhesive layer.

If the battery is swelling, it can take up more space and press the display, and in such cases, you need to act especially slowly, controlling the pressure on the screen from the front, and thermofen will come to the rescue again: short-term heating of the back of the case in the area of the battery will soften the glue.

Installing a new battery requires pre-planning of the seat, the old glue must be removed carefully so that the new battery lies flat and tightly attached to the frame, use isopropyl alcohol to degrease the surface, but make sure that the liquid does not get into the connectors.

Apply a new layer of glue or use special adhesive tapes (B-7000 or analogues) to fix it, install the battery, gently press it over the entire area and let the glue grab for a few minutes, only after that you can connect the plume to the motherboard.

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Before final assembly, check the voltage at the battery contacts with a multimeter.It should be in the range of 3.7-4.2 V. If the voltage is below 3.0 V, the battery can be deeply discharged and require a "push" charger with an adjustable current.

The device is assembled in reverse order, but requires attention to detail. Make sure that all plumes are snapped to a characteristic click, and the screws are twisted with uniform force.

Pay special attention to the antenna contact, which should fit tightly to the board. If the contact is poor, the GSM and GPS reception can deteriorate significantly, and check if any plume is pinched when the cover is installed.

• 🔍 Visually check the integrity of all plumes before closing.
• 🔩 Twisting the screws cross-cross for even distribution of pressure.
• 📡 Make sure the antenna contact (spring) is not bent and touches the site.
• 🧪 Wipe the screen from the inside of your fingerprints before the final frame installation.

Once the phone is turned on, the system may not immediately correctly display the charge level. This is normal, since the power controller has not yet calibrated to the new capacity. To accurately work the percentages, you will need to conduct a calibration cycle that will take some time.

Calibration involves completely discharging the device before turning off automatically, followed by charging up to 100% when off. Repeat this cycle 2-3 times so that the BMS (Battery Management System) controller remembers the real capacitance boundaries.

If the phone continues to show an incorrect percentage after replacing or quickly discharges, it may not be the battery itself that is the problem, but may be influenced by background processes, a faulty charge controller on the board, or software failures in the MIUI firmware.

⚠️ Warning: If the phone doesn't turn on after you've replaced it, don't panic. Leave it on charging on the phone. 30-60 Lithium polymer batteries sometimes take time to get out of deep sleep.

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Proper battery calibration is not a myth, but a necessity for the correct percentage display and stable operation of the power controller during the first days of operation.

Owners often wonder if high-capacity batteries can be used. Physically, only a standard-sized element can be crammed into the Redmi Note 3 Pro case. claims about 5000+ mAh in the size of a regular battery are most often a marketing ploy that hides poor quality cells.

To conclude, we would like to note that replacing the battery is an extension of the life of your gadget for 1-2 years of active operation. Quality repair allows you to forget about finding a socket in the middle of the day and enjoy the stable operation of the Xiaomi Redmi Note 3 Pro.

Keep an eye on the battery in the future: avoid deep discharges to zero and overheating the device. Proper operation of lithium polymer cells is the key to the long-term autonomy of any modern smartphone.