Smartphones series Redmi Note 7 Pro have proven to be reliable devices with excellent autonomy, but over time, the capacity of the lithium-ion battery inevitably decreases. If your phone began to quickly discharge, turn off 20-30% charge or swelled body, it's time to think about replacing the battery. Self-repair saves a significant amount of money and extend the life of the gadget for another couple of years of active use.
The process of replacing the battery in the Redmi Note 7 Pro requires a certain care, since the back cover is glued to a special sealant, and the internal components are located quite tightly. Wrong actions can damage the plumes or the newest battery. In this article, we will discuss in detail all the steps of work, from tool preparation to the final calibration of the system.
Before you start any electronics manipulation, it's important to understand the risks. Lithium-ion batteries are sensitive to punctures and heat, which can cause fire. So, be careful and take your time. If you've never disassembled a smartphone, carefully study each step of the instructions before picking up a screwdriver.
Diagnosis of battery status and preparation
Before ordering a new battery, you need to make sure that the problem lies in the wear of the chemical current source, and not in the software failure or malfunction of the power controller. Modern Xiaomi smartphones have built-in diagnostics. You can check the battery condition through the engineering menu or special applications.
To get accurate data on charging cycles and current capacity, use the code ##6485##. In the menu that appears, find the parameter. MB_06 (Health status, which should be "Good", and MB_00 (Current battery percentage, however, is the most informative parameter. MF_02 (Cycle count, showing the number of complete charging cycles if the meter exceeds 500-800 cycles, and the capacity fell below 80% from the nominal, replacement is necessary.
⚠️ Warning: If the back cover of the smartphone has already begun to move away from the case or you see a deformation of the screen, in any case do not charge the device and do not press on the camera area.
Once confirmed, prepare your workplace, you'll need a clean, well-lit table with antistatic coatings, or just a clean tissue wipe. Get a quality battery labeled BN2 in advance, as this model is designed for the Redmi Note 7 Pro. Using cheap counterparts without protection can lead to unstable phone operation.
Required tools and materials
A good repair is impossible without the right tools. Attempting to open a phone with a knife or a low-quality credit card often results in chipped frames and damaged glass. To work with the Xiaomi Redmi Note 7 Pro, you will need a specific kit that can be bought in radio parts stores or ordered online.
The main list of tools includes a dryer for softening the glue, a suction cup for removing the lid and a set of precision screwdrivers. Pay special attention to the quality of screwdrivers, since screws in Xiaomi are often made of soft metal and easily "lick" when using the wrong size.
- 🔥 Hair dryer (construction or household at maximum power) or heat pad for heating glue.
- 💳 Plastic spatula (mediator) and thin metal scalpel for cutting glue.
- 🔧 Set of screwdrivers (cross-haired) PH000 and Phillips #00).
- 🧴 Clay. B-7000 or T-8000 for sealing the shell after assembly.
- 🧲 Magnetic mat or organizer for sorting screws.
Isopropyl alcohol is also a good thing to mention, because you need it to clean the residues of old glue from the frame of the case, use it at least 90% so you don't damage the electronics with moisture, and prepare tweezers with dielectric tips for working with fine plumes.
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Use a suction cup not only to lift the lid, but also to hold the body in your hands - this will prevent your fingers from slipping off the glass surface.
The process of disassembling the smartphone body
The most difficult step is to carefully remove the back glass panel. Unlike the older models, the Redmi Note 7 Pro has no perimeter screws, the entire structure is held on adhesive basis. The heating must be uniform so that the glass does not burst from the thermal shock.
Turn on the dryer and warm the perimeter of the device at a distance of 3-5 cm for 2-3 minutes. Do not hold the jet of hot air for long at one point, constantly move the device. Periodically check the temperature with your finger - the glass should become hot, but not burning. After warming up, insert a suction cup at the bottom of the back cover and slightly pull up, creating a gap.
Carefully insert a plastic card or a shoulder blade into the gap. Do not dive deeper than 3-4 mm to avoid damaging the tail of the side button or the main camera module, which are located close to the edges. Move the shoulder blade along the perimeter, gradually cutting the glue layer. Be especially careful in the area of the camera module and the fingerprint scanner.
⚠️ Warning: Do not use metal tools to lift the lid first – they can break the glass or close the contacts on the board if you accidentally touch them.
Once the glue is cut all around the perimeter, gently lift the lid. Don't pull sharply, as the fingerprint scanner plume may be glued to the lid (although in this model it is more often connected to the board separately, the risk of damaging thin connections is great). Place the back panel on a safe place with the face down on the soft fabric.
☑️ Preparation for disassembly
Dismantling an old battery and installing a new one
Once the lid is removed, you'll see the inside of the smartphone, which is partially closed by a plastic speaker cover and an NFC module, and you need to start by disconnecting the battery plume from the motherboard, which is a critical step to ensure that you can keep it safe.
Carefully unscrew the screws that hold the plastic lining over the battery and the camera module. Use a magnetic screwdriver, but keep the magnet away from the cameras so as not to demagnetize them. After removing the plastic, disconnect the battery connector by putting a plastic blade or nail on it. Now the device is completely de-energized.
The old battery in the Redmi Note 7 Pro is glued to double-sided tape. To extract it, you can use a special pulling tongue (if it is preserved) or heat the battery area with a hairdryer through an open frame. Heat the back of the phone (if the lid is already removed, warm it carefully from the top) or the battery itself at minimum power to soften the glue.
| Parameter | Meaning | Note |
|---|---|---|
| Model battery model | BN2 | Original or qualitative analogue |
| Capacity | 4,000 mAh | Typical container |
| Tension. | 4.4B / 3.85B | Nominal voltage |
| Type of connection | Connector plume | Requires careful installation |
Remove the battery slowly, without jerking. If it doesn't give in, don't pick a screwdriver underneath, the risk of puncture is very high. Better add a little more heat or use a plastic card to pull the battery around the area. You put the new battery in reverse, degrease the seat and apply a new layer of glue or double-sided tape.
What to do if the new battery is not turned on?
Device assembly and sealing
After successfully installing the new power supply and connecting the plume, you need to check the device's health before the final assembly. Don't rush to twist all the screws. Press the power button and make sure the smartphone responds, the Mi logo appears and the charging process is displayed.
If the phone is turned on, turn it off again and start building. Put the plastic overlay of the speakers and the NFC module in place, twisting all the screws. Notice the length of the screws: they may differ in different angles, twisting a long screw into a short hole can damage the board.
To restore the moisture protection and fix the lid, apply the B-7000 or T-8000 glue in a thin layer to the body frame. Do not apply glue to the electronics and connectors! Let the glue dry a little (1-2 minutes), then gently apply the back cover and press tightly around the perimeter. Lock the device with stationery gums for 30-60 minutes until completely dry.
⚠️ Warning: Excess glue from the joints should be removed immediately before it freezes. Use dry cloth or cotton swab soaked in alcohol, but act carefully so as not to stain the glass of the chambers.
After assembly, it is recommended not to turn on the phone immediately, but to give the glue to gain maximum strength within a few hours, which will ensure a reliable fixation of the cover and protect the insides from dust.
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Quality sealing is not only protection from moisture, but also prevention of dust entering the housing, which can cause short circuit over time.
Calibration and initial setting
After the battery is replaced, Android may not display the charge level correctly because the power controller remembers the parameters of the old battery. To be accurate, you need to perform a calibration procedure, which is especially important if you notice that the charging percentage will jump or the phone turns off at 10-15%.
There are software and hardware calibration methods. The hardware method is more reliable for the Xiaomi Redmi Note 7 Pro. Completely discharge the phone before you turn it off. Then put it on charge when you turn it off and wait for 100% of the charge. After that, don't turn it off for another 1-2 hours. Then turn on the phone without taking it off the charge, and wait for it to be fully turned on.
- 🔋 Discharge the device until completely switched off (0%).
- 🔌 Put on charging in the off state to 100%.
- ⏳ Keep it on the charger for more. 1-2 hour 100%.
- 🔄 Turn on the phone without turning off the cable, and wait for the OS to load.
Software calibration is possible through the engineering menu or special applications from the Play Market, but they often require root rights, which is not always desirable. After conducting 2-3 full cycles of discharge and charge using the method described above, the controller must correctly determine the real capacity of the new battery.