Xiaomi Redmi 8 Pro has proven to be a reliable device with a powerful battery capacity of 4500 mAh, but over time, any lithium-ion power source loses its nominal capacity. If your device begins to discharge in a couple of hours, spontaneously turn off when charging 20% or strongly heat up in the bottom of the case, it is likely time to think about replacing the battery. Self-repair requires accuracy, but it is quite feasible at home with a basic set of tools and careful study of instructions.
The process of restoring the autonomy of the Redmi 8 Pro is technically more difficult than that of standard models, due to the design of the body and the location of the components. You will have to work with a fragile glass back panel and carefully disconnect several plumes connecting the motherboard to the periphery. It is important to understand that a violation of the disassembly technology can damage the display or plume of the fingerprint scanner, so each action must be measured and accurate.
In this article, we will take a look at the entire process, from the preparation of the workplace to the final calibration of the new battery, how to safely open the case, what tools are needed to work with the adhesive joints and how to properly connect the new battery. A critical step is to turn off the battery plume before disconnecting any other connectors on the motherboard, which will avoid short circuit and failure of the power controller.
Preparation of the workplace and selection of components Before the beginning of any manipulation with electronics, it is necessary to prepare a high-quality workspace. You will need a clean, well-lit surface, preferably without pile and dust, as the ingress of small particles under the display or inside the case is unacceptable. To work with the Redmi 8 Pro, you will need a special set of tools, including a suction cup, thin plastic shoulder blades (mediators), a set of Phillips (cross) and Torx screwdrivers, as well as tweezers with curved ends. The market is oversaturated with fakes that not only won't solve the problem of autonomy, but can be dangerous.The original battery for this model is labeled BM4G 4500 mAh (typical). When buying, pay attention to the presence of holograms, the quality of printing on the battery case and the voltage that should be 4.4V or 4.45V. Cheap analogues often have a real capacity half the declared. 📊 What is the reason for the replacement of the battery? 2-3 The phone is off on an hour. 20-30%Battery Bloating and Body Opening Planned Prevention After 3 For fixing the case and carefully disconnecting the plumes, it is also recommended to use a heating element. This can be a professional thermophen, a heating pad for screens or even a conventional household heating pad, heated to 80-90 Temperature is key here: insufficiently heated glue will not allow the case to open without chipping, and overheating can damage the body. OLED-display matrix or melt plastic frame elements.
Rear panel removal and board protection process Start the physical part of the repair with heating the back cover. 3-5 minutes, keeping the hair dryer at a distance 3-4 Do not heat the center back where the camera is located, so as not to damage the optics. After heating, gently insert the suction cup at the bottom of the back panel and slightly pull up, creating a gap into which a plastic blade is immediately inserted. Moving around the perimeter, gradually snap the adhesive layer without undue effort.Redmi back glass 8 The Pro is strong enough, but it can crack when it hits a pinpoint or bending point, and once it's removed, you'll see an interior space that's covered by a black plastic cover that has the main camera and speaker mounted on it. To access the motherboard, you have to unscrew all the visible screws that hold this lid, and the number of screws can vary, but they're usually around. 10-12 Note that screws can have different lengths and threads, so they need to be laid out in a strict order corresponding to their location in the body. Using a magnetic mat or a special matrix for screws will greatly simplify the process of reverse assembly. ☑️ Checking readiness to disassemble Heat the body to 80-90 Prepare the container for the screws Remove SIM-Device shutdown completely Completed: 0 / 4 Once the plastic shield is removed, you can access the top of the motherboard, where the main connectors are located, the main camera module plume and the speaker-audibility speaker plume require special care when you turn off the main connector. They are often fixed with additional plastic pins or metal brackets that need to be carefully bent with tweezers. Shutting down the plumes and removing the old battery is the most critical step, where maximum concentration is required. Before touching any connectors on the board, you need to visually find the battery connector. In the Redmi 8 Pro, it is usually located at the bottom of the board or on the side, covered with a metal screen. Carefully tuck the battery connector with a plastic blade or nail to break the power chain. Only then you can turn off the remaining cords, without plugging the circuits, or switching the camera from the voltage. This often causes the backlight controller or the matrix to fail, resulting in expensive screen repairs. Xiaomi often has tailored ear-tabs to remove the battery itself. If they are preserved, pull them carefully to pull the battery out of your bed, but in most cases, after the first repair or when glued heavily, these tapes break. In such a situation, you have to use a thin plastic card or a special string, carefully skipping them under the battery and cutting the glue layer. ⚠️ Note: It is strictly forbidden to use metal tools (needles, scissors, tweezers) to tweez the battery. If the battery is swelling, it can take up more space than the design provides, and push the display on the back side. Remove such cells with double caution, trying not to damage the shell. After removal, compare the old battery with the new: They must be identical in size, contact location and plume length, and the new battery and device assembly must be thoroughly cleaned of the old glue residue before installing the new battery. Use isopropyl alcohol and a soft lilaless wipe to degrease the surface. A new battery, if it does not have a pre-installed adhesive layer, must be applied to special bilateral adhesive tapes or a thin layer. B-7000 glue (the latter is less desirable, as it will make future repairs more difficult). Put the battery in the case, making sure it's flat and doesn't protrude above the frame level. Connect the battery connector to the motherboard before the characteristic click. Now you can connect all the other plumes in series: the display, the cameras, the side buttons. Make sure that each connector is inserted smoothly and fixed. 💡Before you finally assemble the case, run a test run. Without sticking the back cover, plug the battery in and press the power button. If the phone vibrates and the image appears on the screen, the assembly is successful. install a plastic protective cover, twist all screws (keeping their length), return the main camera module to place. The back panel before gluing is also recommended to warm up slightly to make the glue more elastic. Press the panel around the perimeter and lock the device with rubber harnesses or a load for 15-20 minutes to polymerize the glue. Initial start and calibration of the battery After successful assembly and first turn on, the Android system may take some time to recognize new equipment. Don't be afraid if the phone will charge longer than usual or the charging indicator will "jump" - this is the normal reaction of the power controller to a new chemical composition. For the system to work correctly, you need to perform a calibration cycle. User Action 1. Full discharge Use the phone until the device is fully charged without a charge of the device 3, including a 100 percent switch on. Recharging After Achieving 100% keep on charging again 1-2 Hour saturation of cells to maximum voltage 4. First cycle of work Turn on the phone and use in normal mode Correct display of percentage of charge Calibration helps the system correctly determine the residual capacity and correctly plot the discharge schedule. Without this procedure, you may encounter a situation where the phone shows the 30%, And then suddenly it turns off. Repeat the full discharge-charge cycle» 2-3 time to achieve the best result. 💡Quality of repairs on 80% It depends on the accuracy of the plumes and the cleanliness of the contacts, and haste in assembly is the main reason for repeated calls to the service (FAQ) How long does it take to replace the battery with Redmi? 8 For an experienced master, the process takes about 30-40 minute. When you replace yourself without experience, it is recommended to schedule 1.5-2 hours, including time for careful warming up, glue cleaning and testing. Should I reflash the phone after changing the battery? No, flashing is not required. The operating system automatically adapts to the new power source. However, resetting battery statistics (via engineering menus or special applications) can speed up the calibration process. Can a larger battery, such as 5000 mAh? Physically installing a different battery in a standard Redmi 8 Pro case will not work without disrupting the design. The battery is automatically adapted to the new battery after the battery is damaged, or the battery is damaged by the first battery packing, or the battery is damaged by the battery after the battery is the battery is damaged in the battery is the battery. If the heat is strong and accompanied by a rapid discharge, perhaps the plume is not connected correctly or a defective battery is installed. Where to find the original BM4G battery? Original components are best purchased from authorized Xiaomi service centers or from trusted suppliers with a good reputation. In the electronics markets, there is a high risk of buying a restored or counterfeit battery.