Redmi Note series smartphones are deservedly considered “people’s” devices due to the successful combination of performance and price. However, the Redmi Note 8T model, released in late 2019, has already gone a long way to active use, and for many owners the problem of wear of the power source is becoming urgent. Decreased autonomy, sudden shutdowns at 20-30% charge or bloating are sure signs that the resource of the chemical element is exhausted.
Self-replacement of the battery in Xiaomi Redmi Note 8T is a task that is quite feasible even for a beginner, but it requires accuracy, the right set of tools and understanding of the design of the device. Unlike modern flagships, where the battery is hidden behind glass, in this model, access to the insides opens through the back cover, which greatly simplifies the process, but requires attention to plumes and fasteners.
Diagnostics of the state and preparation of the workplace
Before you start disassembling the case, you need to make sure that the problem lies in the capacity of the battery, and not in the software failure or wear of the power controller. Check the usage statistics in the Android settings or use the engineering menu by entering the code ##6485##. You are interested in parameters MB_06 (battery status; and MF_02 (If the system says "Good" but the phone lives for a couple of hours, it's likely that the actual capacity has dropped below the critical level.
Workplace management is a critical step in the success of the operation. You'll need a clean, well-lit surface, preferably with an antistatic mat. Prepare a set of precision screwdrivers in advance, as the screws in Xiaomi may differ in length and type of slit, and you'll need a mediator or plastic blade to open the case, a suction cup and, preferably, a dryer to soften the glue.
☑️ Repair tools
Special attention should be paid to safety. Working with lithium polymer batteries requires caution, since damage to the shell can lead to fire.
⚠️ Warning: Never puncture or bend an old battery at an angle of more than 90 degrees, even if it is already removed from the housing.
Rear cover removal process
Redmi Note back panel 8T It's made of plastic, and it's mounted on a two-part perimeter glue, and it's got a few screws underneath the stickers, and you start by turning off the device and removing the tray. SIM-Next, you need to carefully unstick the decorative stickers at the bottom of the back, which are the attachment screws, and there's usually two or three of them, and they're of different lengths, so it's important to remember where they are.
After you unscrew the visible screws, you need to warm up the perimeter of the case. Use a hair dryer by heating the edges of the smartphone to a temperature of about 60-70 degrees Celsius for 2-3 minutes. Don't hold the hair dryer too close so as not to damage the display or melt the plastic frame elements. After heating, insert a suction cup at the bottom of the case, create a vacuum, and, pulling the lid, carefully insert the plastic mediator into the resulting gap.
Move the mediator around the perimeter, cutting the adhesive layer. Don't use excessive force to avoid breaking plastic latches, which are often located near the camera module and volume buttons. If the lid is difficult to remove, add a little more heat. After successfully detaching the panel, put it in a safe place, before rubbing the glue from the frames.
💡
To facilitate subsequent assembly, use B-7000 adhesives or special adhesive tapes, pre-fatting the surface with alcohol.
Disabling the plumes and removing the protective plate
When you remove the back cover, you'll see the interior of the smartphone. In the Redmi Note 8T, the battery takes up most of the volume, but access to its contact group is blocked by a metal protective plate located in the center of the device, which is screwed with several screws of different calibers and covers not only the battery connector, but also the display plumes.
Carefully unscrew all the screws that hold the metal bar. Fold them apart from the screws of the case, because they may have different threads. When you remove the bar, you'll see the connectors connected to the motherboard. The first thing you need to do is turn off the battery plume. Use a plastic blade or nail to fit the connector from the bottom up. Metal tools are best avoided, so you don't accidentally close the contacts on the board.
After the battery is turned off, you can carefully extract the main board if required for access, but in most cases, it is enough to simply remove the top plastic speaker cover and access the battery itself to replace the battery in the Redmi Note 8T. Be careful with the main camera plume, which often runs over the battery or is attached to the top bezel.
Features of Xiaomi plumes
Removal of the old battery
The battery in the Redmi Note 8T is planted on a rather aggressive glue that hardens over time, making it difficult to remove the battery. Under no circumstances do not try to tamper with the battery with a metal object with effort - this is guaranteed to lead to puncture and a fire hazard situation. There are several proven ways to dismantle.
One is to use a solution (isopropyl alcohol or glue-removal fluid) to carefully apply a few drops around the battery perimeter, trying not to fill the control board. Let the liquid absorb for 5-10 minutes. The other is to use a thin line or string. Strip it under the battery on the bottom and, as you move around, gradually cut through the adhesive layer as you move up.
If you feel that the battery is “going” with great difficulty, it is better to add another solvent and wait.
⚠️ Attention: If the battery is swelling, be very careful. Any mechanical pressure can interfere with the tightness of the shell. In this case, do not use the fishing line method, but gently pull the edges with a plastic blade.
| Parameter | Original (Xiaomi) | Quality analogue | Cheap copy |
|---|---|---|---|
| Capacity | 4,000 mAh | 3800-4000 mAh | 2500-3000 mAh |
| Tension. | 3.85V - 4.4V | 3.85V | 3.7V - 3.8V |
| Controller | Original BMS fee | High-quality chip | Cheap analogue, possible failure of the software |
| Cycle resource | 500+ cycles | 300-400 cycles | 100-150 cycles |
Installation of a new battery and assembly
Before installing a new battery, compare it visually with the old one. The size, location of the contact group and the length of the plume should be completely the same. It is critical to check the voltage on the contacts of the new battery before connecting: it should be in the range of 3.7-3.8 V. If the voltage is below 3V, the controller could go into protection, and the phone may not turn on without a special activator.
Apply a thin layer of B-7000 glue or use double-sided tape (pre-cut in shape) to the seat. Carefully stow the battery, making sure it doesn't protrude over the edges or press on other components. Plug the battery plume until a characteristic click. Don't turn the phone on right away - first assemble the device at least partially, screwing the protective plate.
Once you've connected the plume and put in the metal bar, you can press the switch on, and if the screen catches fire and the phone starts charging, it's been a success, and you can now completely assemble the case, stick the back cover, twist all the screws, and put back the decorative stickers, and let the glue dry for 2-4 hours before active use.
First launch and calibration
After a successful battery replacement in the Xiaomi Redmi Note 8T, it is recommended to conduct a calibration procedure, which will help the system correctly display the percentage of charge and optimize the operation of the power controller. Modern smartphones do this automatically, but manual control will not hurt, especially if you used a non-original element.
Discharge the phone until it is completely turned off (0%). Then charge it when it is off to 100%. After reaching full charge, do not turn off the cable for another 1-2 hours. After that, you can turn on the device. If the indicator shows less than 100%, reconnect the charge. Repeat the cycle of full discharge and charge 1-2 times.
In the system settings (Settings → About Phone → All Options → Version of the kernel – press 7 times) you can activate advanced logs, but for the average user, a standard procedure is enough. Do not use third-party apps for “calibration”, as they are often useless software, only consuming the life of a new battery. Android system itself reads data from the BMS of the battery controller.
💡
Calibration of the battery is not magic, but the process of synchronizing the readings of the charge controller with the real capacity of the new battery.