Smartphone Xiaomi Mi A2 Lite is also known as Redmi. 6 Pro in some regions, originally equipped with a battery capacity 4000 Over time, after 2-3 In the years of active use, the chemical structure of the lithium-ion cell degrades, which leads to a sharp decrease in battery life. 15-20% Or it’s too hot, it’s time to think about replacing the battery.
Self-repairing at home is not only a way to save money, but also a valuable experience in disassembling modern electronics. However, the process requires care, since the Mi A2 Lite has an all-metal body with plastic inserts for antennas, which imposes its limitations on opening methods.
In this guide, we will take a detailed look at each step, from selecting a quality component to final calibration of the system, which tools are really needed, how to safely disconnect the plumes and what to look for when building, and a well-conducted procedure will return your device to its former performance and prolong its life.
⚠️ Attention! You do all the manipulation of the internal components of your smartphone at your own risk. Careless handling of tools can damage the display, motherboard or battery fire. If you are not sure of your abilities, it is better to contact an authorized service center.
Diagnostics and selection of a new battery
Before starting to disassemble, you need to make sure that the problem lies in the physical wear of the battery. Software failures can give similar symptoms, so the first step is to check the state of the system. On Android, which is installed on the Xiaomi Mi A2 Lite, you can use built-in diagnostic codes or third-party utilities to monitor the status of the BMS (Battery Management System).
If the diagnosis confirms wear, it is a question of choosing a new battery. There are many options on the market, from original components to cheap counterparts. The original will be labeled BM49 or the corresponding article specified by the manufacturer. Copies often differ in real capacity from the declared one and may not have protection against overheating.
When choosing, consider the date of production. Lithium batteries age even without use, so buying a battery that has been in storage for more than two years is not advisable.
How to distinguish the original from the fake?
Tools and workplace preparation required
You can't have a good repair without the right tools. You'll need a specific set to replace the battery in the Mi A2 Lite, because the case of the smartphone is assembled using a lot of screws and adhesives. The absence of the right screwdriver can cause the faces of the fasteners to break down, which will make it much more difficult to assemble.
The workplace should be well lit and organized. Small screws are easily lost, so it is recommended to use a magnetic mat or container with cells. It is also crucial to turn off the phone and discharge it to a minimum before work begins to reduce the risk of short circuit.
The following is a list of tools that will ensure the safe conduct of the procedure.The use of improvised means, such as knives or pins, is strongly discouraged due to the high risk of damage to internal components.
- 🔧 Set of screwdrivers: mandatory presence of cross PH000 and maybe stars. T5 (though A2 Lite is mainly used by ordinary small screws).
- 🔥 Dryer or heat tile: necessary to warm the perimeter of the body to soften the glue holding the back cover.
- 🛠 Plastic mediators and suction cup: metal blades can damage antenna inserts or scratch the frame, so we use only plastic.
- 🧴 Isopropyl alcohol and pipette: for dissolving glue residues in hard-to-reach places.
- 🧲 Magnetic card or organizer: for sorting screws of different lengths, as their location in the board is strictly regulated.
☑️ Ready for repair
Rear cover removal process
The most difficult step, which requires patience, is the detachment of the rear panel. Unlike modern smartphones with glass backs, the Xiaomi Mi A2 Lite has a metal body, but it is also planted on adhesive around the perimeter. The heating must be uniform so as not to damage the internal plumes that pass close to the edges.
Turn on the dryer at an average temperature (about 80-100 degrees) and evenly warm up the ends of the device for 2-3 minutes. Do not hold the hair dryer still at one point, so as not to overheat the display matrix or plastic structural elements. Periodically check the softness of the glue, trying to gently tamper with the mediator.
Once you have a little gap, put a plastic card or a mediator in there. Move around the perimeter, cutting the glue layer. Don't try to pull the lid off abruptly, because there may be button plumes or antenna contacts glued to it, and act slowly, controlling every movement.
⚠️ Attention! If you feel strong resistance when you try to remove the lid, stop pulling. You may have forgotten to unscrew the hidden screw or you have not warmed up enough glue. Excessive force will cause the fingerprint scanner plume or speaker to rupture.
Once you successfully remove the lid, you'll see a metal screen covering the motherboard and the battery, and it's also attached to a lot of screws, and you'll need to unscrew them in order to avoid confusing the length when you reverse assemble them.
Disconnecting plumes and removing the old battery
Once the metal screens are removed, the main components are accessed, and the first step is to disconnect the battery from the motherboard, which is a critical safety step: while the battery is connected, any manipulation of other plumes (screen, cameras, boards) can cause a short circuit.
The battery plume in the Mi A2 Lite is usually located at the bottom of the board or side, depending on the revision.Use a plastic blade to snap the connector.Do not use metal tweezers near the open connectors.
The battery itself is glued to the body with double-sided tape, which you can't use force to extract, and there are two main methods: using a special pulling tongue (if it's preserved), or gently tweaking the edges of the card while warming the back of the case with a hairdryer.
| Parameter | Old battery | New battery | Norma. |
|---|---|---|---|
| Tension. | 3.85V | 3.85V | ± 0.05V |
| Capacity | less than 3,000 mAh | 4000 mAh | 4000 mAh |
| Appearance | Bloating, oxidation | Smooth, clean. | Free of defects |
| Weight. | Less than 55g | About 65g | According to the specification |
If the battery is too swelled, be very careful. A puncture of the bloated battery can lead to the ignition of the electrolyte, in which case it is recommended to additionally fix the element with tape before extraction and not press on the center of the bloating.
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To make it easier to remove the old battery, you can use a medical syringe with isopropyl alcohol, inject liquids under the battery through the gap, wait a minute for the glue to dissolve, and carefully remove the element, which is safer than picking with a screwdriver.
Installation of a new element and assembly of the device
Before installing a new battery, make sure that the connector matches the connector on the board. In rare cases, suppliers can send a battery with a mirrored plume arrangement, which will make the installation impossible without soldering the connector. Also check for the adhesive layer on the new cell.
If there is no glue, use special battery adhesive tapes or B-7000 double-sided tape. Apply the adhesive sparingly, avoiding contact and dynamic area. Press the battery against the case and let the glue grip for 10-15 minutes before final assembly.
Connect the battery plume to the metal screens. Make sure the connector is up to click and straight. After that, you can install the protection screens, twist the screws and return the back cover to the place. It is also advisable to plant the lid on a new layer of glue or use a special sealant for smartphones.
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Proper battery installation ensures not only long-term operation, but also the safety of the device. Poorly pressed plume can cause the phone to spontaneously turn off when vibrating or impacting.
First start and calibration of the system
After the physical assembly of the device, the software setup stage begins. When you first turn on the Xiaomi Mi A2 Lite can take a long time to load — this is normal, the new power controller is initialized. If the phone is turned on, check the charge level immediately.
Android may not correctly display the percentage of charge of the new battery, because the file statistics have stored data on the old, worn-out element. To correct this, you need to conduct a calibration procedure, which will help the system correctly determine the boundaries of full charge and discharge.
Calibration is simple, but it takes time. Discharge the phone until it's completely turned off (0%). Then, when it's off, charge it to 100%. Don't turn the phone on in the process. After reaching 100%, hold it on charging for another hour. Then turn on the phone and check the result.
- 🔋 Completely discharge the device before switching off.
- 🔌 Put on charging in the off state to 100%.
- ⏳ Keep on charging for another 60 minutes after full filling.
- 🔄 Turn on your phone and use it normally until the next full discharge.
Repeating the cycle 2-3 times usually completely updates the battery statistics in the system. If the problem with the display of charge persists, you may need to reset or flash, but in 95% of cases, mechanical replacement and simple calibration is enough.
What if the phone doesn’t turn on after replacement?
Do I need to remove the protective film from the new battery?
How to dispose of an old battery?
Replacing the battery with Xiaomi Mi A2 Lite is a task that is quite solvable for a home craftsman with minimal experience. The main thing is to take your time, use quality tools and observe safety. Properly executed repairs will allow your smartphone to last for several more years without losing autonomy.