Modern smartphones, including the popular Xiaomi Redmi Note 8 Pro, are designed with the expectation of a monolithic design, which makes the procedure of replacing batteries difficult for the average user. The need to get a battery often occurs not only when the battery fails, but also when repairing other components, such as a charging connector or a lower board. Owners often face a situation when the device stops holding a charge or a swollen element begins to press on the screen, creating characteristic rainbow spots.
The opening process requires the utmost care, as the back cover is glued around the perimeter and the internal components are tightly pressed by metal frames. Any careless movement can damage the plumes or puncture the lithium polymer element, which is fraught with ignition. In this article, we will discuss each stage of dismantling, paying special attention to safety and model specifics.
Before you start dismantling, you need to make sure you have all the tools and the workplace is ready. It is important to understand that self-repairing is not warranty if it is still valid, but for a device released several years ago, it is often the only economically viable option to restore operability. Careful adherence to the instructions minimizes the risks of damage to expensive components.
Tools and workplace preparation
Quality training is half the success of any electronics repair. With the Redmi Note 8 Pro, you'll need a specific set of tools that you won't always find in a regular kitchen. Using inappropriate items like knives or pins greatly increases the risk of slipping and short circuiting.
Organize the space so that the small screws are not lost, and the lighting allows you to distinguish the smallest details. Magnetic mat or sorter for screws will be great help, because the design of the smartphone uses fasteners of different lengths and diameters, confusing them when you build, you can damage the thread or penetrate the body through.
- 🔧 Screwdriver kit: cross (PH00, PH000) hexagonal.
- 🔥 Hair dryer or heating pad: for softening the glue under the back cover (temperature not higher than 100)°C).
- 🛠 Suction and mediators: for careful peeling off of the lid without chipping.
- 🧤 Dielectric gloves and tweezers: for safe battery handling.
⚠️ Note: It is strictly forbidden to use a metal scalpel to peel off the lid in the immediate vicinity of the volume buttons and plumes, since there is a high risk of cutting the conductors hidden under the frame.
Removal process of the back cover
The first and most important step is to dismantle the glass back panel. Xiaomi uses a fairly aggressive adhesive compound that polymerizes over time and becomes very durable. Start heating should be uniformly throughout the perimeter, paying more attention to the corners where the adhesive collects in greater volume.
After warming up, insert a suction cup at the bottom of the body, pull the glass slightly, and insert a thin mediator into the gap. Move the tool along the edges, trying not to immerse it too deeply so as not to damage the side plumes or antenna modules. If the lid is removed with difficulty, it is better to add a little more heat than to apply physical force.
Pay special attention to the areas around the main camera module. Here, the glass is often stronger, and the risk of damaging the lenses or sensors when you move sloppy is extremely high. Smooth movements and patience are key factors in success at this stage. Don't try to plug the buttons, there are fragile controls.
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Use isopropyl alcohol to dissolve glue residues around the perimeter if standard heating does not help separate the lid.
Dismantling the protective plate and disconnecting the plumes
After successfully removing the back cover, you will see the inside of the smartphone, closed with a black plastic lining, which protects the main nodes from dust and fixes the connectors, and to remove it, you need to unscrew all the visible screws, the number of which can vary depending on the revision of the board.
Once the plate is removed, the first thing you need to do is turn off the main battery plume, which is a critical step, because working with the conductive components under voltage can short circuit and cause the motherboard to fail.
To turn off the plume, use a plastic blade or a finger in a dielectric glove. Metal tools are best avoided here, so as not to accidentally close contacts on the board. Carefully lift the connector up without pulling the wires. It is also recommended to turn off the display plume if you plan to completely disassemble, but this is not always necessary to replace the battery.
☑️ Safe shutdown
Removal of the battery from the housing
The battery itself in the Redmi Note 8 Pro is fixed to double-sided tape, which eventually loses its properties, but at the time of withdrawal can hold very tightly. Under the battery often pass the plumes of the display and other modules, so pull the battery up without preliminary preparation is absolutely impossible.
There are several proven methods of extraction, and the safest is to use special pull-out bands, if they were installed in the previous repair, if they are not, you can carefully tamper with the edge of the battery with a mediator on the opposite side of the plume, trying not to damage the shell, and heating the back of the case also helps soften the glue under the battery.
Do not puncture or bend the battery. Lithium polymer cells, when the shell is damaged, instantly light up, and it is almost impossible to extinguish such fire with conventional means. If the battery is swelling, treat it with extreme caution, avoiding any pressure.
⚠️ Warning: If you smell an electrolyte or see smoke during the extraction process, immediately stop working, take the device out to an open space and prepare a fire extinguisher or sand.
What to do if the battery is stuck dead?
Comparison of original and compatible batteries
When replacing a battery, it is a question of choosing a new battery, the market is oversaturated with offers, and it can be difficult to understand them. Original batteries are labeled by the manufacturer and often come with protective stickers, while copies can differ in the quality of the cells and the presence of a protection controller.
Using a poor-quality battery can cause rapid wear, improper display of percentage of charge or even damage to the power controller on the board.When buying, pay attention to the capacity declared by the manufacturer and the presence of holograms. Xiaomi is characterized by a marking with a production date, stamped on the element itself.
| Characteristics | Original (OEM) | Quality copy | Cheap analogue |
|---|---|---|---|
| Capacity | 4500mAh (real) | 4000-4300 mic | 2500-3000 mAh |
| Cycle resource | 800+ cycles | 500 cycles | 200 cycles |
| Protection | Full (controller) | Basic | Absent. |
| Price. | Tall. | Medium | Low. |
When you install a new battery, make sure the connector sits tightly in the connector. Unpressed contact will cause the phone to not charge or only see charging in a certain position. Once connected, you can conduct a primary diagnosis without fully assembling the case.
Assembly and primary diagnosis
The final step is to assemble the device in reverse order, install the new battery, making sure it's flat and not bulging, plug in the power plume, then put the safety plate in place and twist all the screws, see if there are any extra parts left.
Before you stick the back cover, turn on the phone and check its performance: charging, touchscreen response, camera performance. If everything is working correctly, degrease the body and cover with alcohol, apply a new layer of glue or use special adhesive tapes (B-7000) and tightly press the parts.
After assembly, it is recommended to calibrate the battery. To do this, completely discharge the smartphone before turning off, then put it on charge and bring it to 100% without interrupting the process. This will help the power controller correctly display the charge level. Proper calibration prolongs the life of the new cell.
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The quality of the glue for the back cover directly affects the moisture protection and durability of the repair – do not skimp on adhesive.