The Xiaomi Mi 8 Lite smartphone, released in 2018, has proven to be a reliable device with a great screen and a good camera, but time inexorably affects the capacity of lithium-polymer batteries. If your device begins to quickly discharge, turn off 20% charge or inflated, it’s time to think about replacing the battery. Self-repair saves a significant amount of money that would have to be paid in the service center, but requires accuracy and understanding of the physical processes inside the gadget.
The replacement process is not trivial, as modern smartphones are assembled with minimal gaps and use a large amount of glue to ensure tightness and rigidity of the structure. In the Mi 8 Lite model, the rear cover is made of glass, which increases the risk of damage if unguarded opening, so preparing the workplace and tools plays a critical role. Before starting to disassemble, make sure that you have a new quality power element marked BM3E, as using cheap analogues can lead to unstable operation of the power controller.
It's important to understand that interfering with the design of the device automatically deprives you of warranty if it was still in effect, but for a device that is several years old, this is no longer relevant. The main difficulty is to properly warm up the adhesive base and safely disable the plumes, which are located in this model quite tightly. The nominal capacity of the original battery is 3350 mAh, and any significant deviations in the large direction when buying often indicate a fake.
To successfully carry out the replacement procedure, you will need a specialized toolkit that minimizes the risks of damage to internal components.Do not try to use kitchen knives or needles, as they can damage the insulation or, worse, close contacts on the board, which will lead to irreversible consequences for the motherboard.
Organize workspace on a bright table with good lighting so that small screws are not lost and the plumes are clearly visible. It is recommended to use a magnetic mat or spread out a sheet of paper with painted squares on the table to sort the fastener by dismantling stages, since the screws in the Xiaomi Mi 8 Lite have different lengths and threads.
A basic list of tools that should be on hand before starting work:
- 🔥 Dryer or heat heater for uniform heating of the back cover to temperature 80-90 degree.
- 🛠️ A set of cross-sting screwdrivers PH000 and PH00 frame-and-board.
- 🎴 Plastic mediators (scapula) and a suction cup for careful peeling off of glass without chipping.
- 🧴 Isopropyl alcohol or special solvent B-7000 glue-removal.
⚠️ Warning: Before starting any work, be sure to turn off your smartphone. If the battery is swollen and interferes with the closure of the case, do not try to prick it or compress it by force - this can cause the electrolyte to ignite.
The use of isopropyl alcohol is preferable to ordinary water or acetone, as it evaporates quickly and does not conduct current, which reduces the risk of short circuits if the liquid accidentally enters the body.
Rear cover removal and protection process
The first step is to heat the perimeter of the back cover, where the adhesive layer is located. Turn the dryer on average power and evenly warm the ends of the device for 2-3 minutes, constantly moving the flow of hot air so as not to overheat the display matrix or plastic frame elements.
After warming up, press the suction cup to the bottom of the back cover and create a small gap by gently pulling up. Insert a plastic mediator into the resulting gap immediately and, without removing it, lead along the perimeter, cutting the softened adhesive layer. Act without jerking, as the Mi 8 Lite glass is fragile enough to burst under uneven pressure.
Once you remove the lid, you'll see a black plastic panel that covers the bulk of the insides, and it's locked with a lot of perimeter screws and one screw in the center, often hidden under a sticker or seal. Unscrew all the visible screws using the right size screwdriver to keep your hats from licking, and carefully remove the plastic pad with a mediator.
Under the plastic protection, you have the upper body with the camera module and the speaker, and the lower part with the charging connector. To access the battery, you have to remove the bottom plastic cover, which is also secured by screws. Be careful with the fingerprint scanner plume if it passes near the disassembly zone, although in this model the scanner is located on the edge.
What to do if the lid is not removed?
If the lid doesn't warm up, don't use excessive force. 30-60 You can drop a little alcohol in the gap to dissolve the glue, but make sure that the liquid doesn't get on the speaker or into the camera lenses."/> Disabling the plumes and removing the old battery Once all the shields are removed, you have access to the motherboard and the battery, and the first thing you need to do is turn off the device by disconnecting the battery connector from the board. Use a plastic shoulder blade or nail, but not metal tweezers to avoid closing contacts. - Xiaomi Mi battery 8 Lite is glued to the frame with double-sided tape around the perimeter and in the center, and it will require heating again to extract it. Carefully warm up the battery area through open holes or on the front side (if the screen is already removed, which is not required in this instruction, since the replacement is made from the rear) to soften the glue. Use a plastic card or a special lever to tamper with the battery. Start disconnecting from one of the corners, gradually moving deep. It is strictly forbidden to use metal objects to tamper with the battery, since the puncture of the lithium polymer cell shell causes an instant chemical reaction with the release of heat and smoke. If the battery sits very strong, you can use the method with the most secure component movement (this is the battery, for example, to break the battery) and the battery with the most s. Installation of a new battery and assembly The new battery should be installed in a strictly defined position, coinciding with the marking on the board or the old battery. Before final fixation, check whether the connector connector matches, and gently connect the plume to the characteristic click. To fix the battery, use special adhesive tapes (B-7000 Or double-sided electronics tape. Apply the adhesive in a thin layer only on the frame, avoiding hitting the battery and board itself. Press the element for a few minutes for the primary contraction. Parameter Original Acceptable Analogue Critical Model BM3E BM3E (High Copy) High capacity 3350 mic 3300-3400 MAC Medium Voltage 3.85V 3.80-3.87V High connector Matched Accurate match Critical Assembly is done in reverse order. Install plastic protective covers, twist all the screws. Pay special attention to the screws around the camera module and the charging connector. After installing the back cover on the glue, it is recommended to fix the smartphone with rubber bands on the device. 1-2 half-hour before the glue is completely dry. 💡Properly fitting the battery and no gaps between it and the body are critical to prevent further bloating and ensure stable contact during vibrations.First start and calibration of the system After physical assembly, don't rush to turn the device on immediately. Let the glue be completely polymerized. When you first turn on, the smartphone can load longer than usual, because the system needs to interview the new power controller and calibrate the readings. Completely discharge the smartphone before automatically turning it off, then charge it when it is off to 100%. After reaching full charge, hold it on the wire for another 1-2 hours. In some cases, especially when installing non-original batteries, the MIUI system can issue a warning about an uncertified battery. This message can be ignored if the battery is of high quality, but it will pop up at each boot until it is reset through an engineering menu or special utilities. Pay attention to the heating of the device in the first hours of operation. It is normal to lightly heat up the camera area, but it is not active in the upper part of the battery, but it is damaged in the heater, but it is only when the battery is damaged in the upper part, but the heater is not in the case. 📊 Yes, there was often one No, change preventively Do not use old models Frequent errors and precautions One of the most common mistakes is damage to the plume of the main camera module with careless removal It's a plastic shield. 8 The Lite is located very close to the screws, and slipping the screwdriver can lead to black stripes in the photo or complete failure of the photo module, and users often forget to clear the contact areas before installing a new battery. Oxids or glue residues on contacts can lead to increased resistance and false charge readings when the phone is turned off on the phone. 30-40%. ⚠️ Warning: Never use superglue (cyanacrylate) to lock the battery or lid. Its pairs settle on the camera and speaker optics, irrevocably spoiling them, and the glue itself becomes brittle and does not hold the load. Another mistake is the retraction of the screws. Plastic struts in the case easily crack, which leads to a backlash of internal components and the appearance of extraneous sounds when the vibrator is working. Twirling the screws tightly, but without fanaticism, feeling the moment of resistance. If the phone does not turn on after replacing, check the connection of the battery plume and the condition of the connector itself. Perhaps during installation one of one of the contacts on the circuitry, you can already use the battery, if the battery is more difficult to use the battery, if the battery protection system can be used from the charger, but the battery, if the battery is more difficult to use the battery. After successful replacement and calibration, it is worth diagnosing the system condition. Xiaomi smartphones have a hidden engineering menu accessible through code ##6484## Select Battery or Status to check the actual voltage and temperature. Pay attention to the discharge rate in standby mode. 5-7% If you have a charge problem with the grids off, it may not be the battery that is the problem, but the software or background processes that eat up the energy. If you find problems with charging (long wait, interruptions), check the Type-C connector. When disassembling it, it may have become contaminated or oxidized. Cleaning the connector with a toothbrush and alcohol often solves the problem of poor contact.Stable performance Xiaomi Mi 8 Lite with a new battery should last at least 2-3 years with moderate use. If the degradation of the capacity is observed again after six months, it is worth considering replacing the charger, since a poor-quality power supply could cause the failure of both the first and second batteries. Why does the phone write "Uncertified" after replacement? MIUI check-in ID On non-original batteries, this is ID It's not a problem, it's a problem, but it's annoying to have a notification, and you can remove it through an engineering menu or a patch, but it requires root rights. B-7000? The primary process of seizing is for 3-5 minutes, but the full strength of the glue is gaining within 24 On the first day, it is not recommended to expose the phone to loads, vibrations or moisture. Can I warm the screen with a hairdryer when removing the lid? It is absolutely not recommended to point the hairdryer at the screen. OLED and IPS sensors are sensitive to temperatures above 80 degrees and can get image defects (yellow spots) or peel off. What to do if a new battery swells? Immediately stop using. This is a manufacturer's defect or a deep discharge during storage. Operation of a bloated element is dangerous to fire. Refund is required to the seller. Should you reset after replacement? Reset (Wipe Data) is not mandatory, but desirable if there are system glitches. Often the power controller works better after a clean installation of the system, but in 90% of cases a simple reboot is enough.