Xiaomi Redmi 8, released in late 2019, is still popular due to its reliability and autonomy. However, time is not spared lithium polymer cells, and after a few years of active use, owners begin to notice a reduction in operating time. The natural question is how worn out the battery is and whether it should be changed right now. In this article, we will discuss in detail all available diagnostic methods.
Unlike some competitors, MIUI does not always provide a direct figure of battery health in the standard menu, so you will need to use a combination of embedded codes, third-party software and even computer utilities to get reliable data. Accurate diagnosis will allow you to understand the real state of the device and avoid sudden shutdowns.
Before you start to do complex manipulations, it's important to understand that any software method only gives a rough estimate based on the computational data of the controller. However, by combining several methods, you can get the whole picture. Let's take a look at what tools are available to the Redmi 8 user right now.
Built-in codes and MIUI engineering menu
The fastest way to get primary information about the state of the power system is the use of special information. USSD-Xiaomi smartphones have powerful diagnostic tools available without root permissions. First, try entering code ##6485## in the standard Phone app".
Once you enter the combination, you'll see a list of technical parameters on the screen. MB_06 (Health), which shows the state of the battery, and MB_00, It's a current percentage of charge, if you have a parameter on the list. RF_02, It will indicate the estimated residual capacity, but on some firmware versions, MIUI This data may be hidden or replaced by “Good” codes".
⚠️ Warning: Do not try to change the values in the engineering menu unless you know exactly what they are responsible for. resetting the calibration without special equipment can lead to incorrect display of the charge.
If the code didn't work or the data is missing, you can try logging into the full engineering menu via the command ##4636##. Here you can select "Battery Information." This section shows voltage, temperature and connection status. Although there is no exact digit of capacity here, sudden surges or abnormal heating will indicate critical wear.
What do I do if the codes don't work?
Use of third-party applications for Android
When built-in tools are scarce, Google Play comes to the rescue, with apps like AccuBattery or Battery Guru able to calculate real capacity by analyzing charging and discharging cycles, and they work by tracking the amount of energy entering the battery and matching this with the change in percentage of charge.
To get accurate data from AccuBattery, you'll need to use your smartphone as normal for a few days, and the program will collect statistics and show you the estimated capacity in mAh in the Health section, which is compared to the factory standard of 5,000 mAh, which allows you to calculate the percentage of wear and tear.
The advantage of these applications is that they're accessible and easy to use, and you don't need technical knowledge to see the degradation graph, but you have to consider that in the first 24 hours of operation, the data may be inaccurate, because the system takes time to calibrate the algorithms for a particular instance of battery.
Diagnostics through computer and ADB
For advanced users who want to access system logs without installing excess software on the phone, the method using debugging is ideal. USB. You'll need a computer, USB-cable and minimum set of drivers ADB. This method allows you to read data directly from the system files of Android.
First, activate Developer Mode. Go to Settings → About Phone and quickly press 7 times on "MIUI Version." Then turn on "Debugging over USB" in the "Additional" menu. Connect Redmi 8 to your PC and enter the following command to read the battery file in the command line:
adb shell dumpsys batteryThe team will display the current battery status, including charge level, status and technology. For a deeper analysis, you can use the adb shell command, and then go to the kernel logs, which often contain data about charging cycles. However, this method requires the ability to read technical logs, where the desired parameters can be encrypted in hex format or specific strings.
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Use an original or quality certified cable to connect to a PC. Cheap cables can only transmit charging current, but not data, leading to a connection error.
Analysis of recharge cycles and their impact
Understanding the charge cycle is critical to assessing the health of your Redmi 8. One cycle is 100% battery consumption, but not necessarily at one time. For example, if you drained your phone from 100% to 50%, charged it back, and then discharged it again to 50%, that would total one full cycle.
Lithium polymer batteries installed in the Redmi model 8, averaged 500-800 full-cycle 20% After that, the chemical composition degrades, the internal resistance increases, and the phone starts to discharge faster under load. It is harder to check the exact number of cycles on Android than on iOS, but you can calculate the approximate count through tracker applications.
If you use your smartphone actively, charging it every day, you can run out of power in 3-4 years, and even charging it fully won't keep it on for long. Deep discharge is also harmful: if the phone was left with 0% charge for a long time, the chemical processes inside could become irreversible.
| Parameter | Norma. | Critical condition | Impact on Redmi 8 |
|---|---|---|---|
| Residual receptacle | 4500-5000 mic | Less than 3,500 mAh | The phone is off by 15-20% |
| The tension of peace | 3.7. to 4.2 B | Below 3.4 B | Unstable operation of the processor |
| Temperature. | 25 - 35 °C | Above 45°C | Accelerated degradation of chemistry |
| Charging cycles | 0 - 500 | More than 800. | Significant decrease in autonomy |
Visual signs and physical checks
Software techniques are good, but the physical condition of Xiaomi's battery often says more than any number.Bulking is the most dangerous symptom that can't be ignored.If you notice the back of your smartphone starting to move away from the case or the screen is slightly raised, stop using the device immediately.
Bloating occurs because of the release of gases inside the cell when the electrolyte breaks down. The pressure of the gases bursts the shell, which can damage the display matrix or even fire when mechanically exposed. In the Redmi 8, the battery is non-removable, but the back cover is plastic and can deform before the cell itself bursts.
⚠️ Attention: If you find bloating, do not try to prick the battery or press hard on the screen.This may cause ignition.
Also note the charging speed. If the Redmi 8 used to charge in 2 hours, and now the process takes 4-5 hours or the phone is warming at the connector, this is a sign of high internal resistance. The power controller may misidentify the level of charge, which causes percentages to "jump" (for example, from 40% sharply falls to 10%).
☑️ Signs of wear and tear of the Redmi 8 battery
When a battery replacement is needed
Replacement of battery with Xiaomi Redmi 8 — procedure required if the residual capacity has fallen below 70-75% In terms of numbers, that means that the actual capacity is less than the 3500-3750 Operating a severely worn-out battery is not only inconvenient, but also dangerous for the motherboard due to unstable voltage.
When choosing a new battery, it is important to pay attention to the labeling. QR-Cheap analogues can have a declared 5,000 mAh, but physically hold 3,000 mAh, which will not solve the problem of autonomy. Use only certified batteries with protection against overheating and overcharging.
The replacement process requires care, because the back cover is glued, you need to heat the perimeter of the case, remove the cover, unscrew the screw plate and replace the plume. If you're not sure about your skills, you better trust the professionals to do so so, so that the display plumes or the screen itself are not damaged.
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Replacing the battery will return your Redmi 8 to factory autonomy and stability, extending the life of the device for another 2-3 years.