The Redmi Note 8 Pro lineup, released in 2019, has become a real bestseller thanks to the powerful Helio G90T processor. However, like any complex electronic device, they are subject to natural wear and tear of components, especially lithium polymer battery, the resource of which is limited by the number of recharge cycles.
Many owners notice that by the third or fourth year of operation, the device stops holding a full-day charge, and sometimes even turns off at 20% on the indicator, a sure sign that the capacity of the chemical current source has significantly decreased.
In this article, we will discuss in detail how to accurately diagnose the battery status of your Redmi Note 8 Pro using built-in system tools, hidden engineering menus and third-party software for your PC.
Symptoms of battery degradation in the Redmi Note 8 Pro
Before you start software checks, you should pay attention to the indirect signs that the device provides. Android system on the shell of MIUI does not always honestly display the percentage of charge if the power controller receives incorrect data from the battery controller (BMS).
The most alarming signal is a sharp drop in voltage under load, for example, if you watch a video, and the charge drops from 45% to 15% in a few minutes, which indicates a high internal resistance of the element.
⚠️ Please note: if your Redmi Note 8 Pro turns off when 20-30% charge, this may indicate not only wear, but also the stratification of the electrolyte inside the cell, which is dangerous overheating.
If the device charges very quickly (up to 80% in 20 minutes) but then the process stops or goes extremely slowly, the controller tries to compensate for the shortage of real capacity.
Visual inspection of the case is also important. The Redmi Note 8 Pro has a glass back cover, and bloating the battery often leads to detachment or cracks, which requires immediate intervention.
Checking through the engineering menu and USSD-code
The fastest way to get the primary information about the health of the power system is to use the hidden menu of the MIUI diagnostics, which does not require additional software installation and works at the core level of the system.
To access the menu, you need to open the standard Phone app and enter a special code. On the Redmi Note 8 Pro, this can be the command ##6485##. Once you enter the menu, it will open automatically.
In the list of parameters you are interested in the following lines:
- 📊 MB_06 — Shows the current state of the battery (Good/Normal).
- 🔋 MF_05 — displays the actual residual capacity in mAh.
- ⚡ MF_02 or MF_06 — number of full charge cycles.
It is important to understand that the line MF_05 It shows the current charge, not the passport capacity. To find out the wear, you need to compare the value. MF_05 (or similar parameter displaying full capacity with factory standard in 4500 mic.
What if the code doesn't work?
Some firmware versions may hide some of the data in this menu, so if you only see the "Good" status, it just confirms that the controller doesn't see critical voltage errors, but it doesn't tell you how much wear and tear is going on.
☑️ Diagnosis through code
Using ADB for accurate BMS data
To get the most accurate technical information that MIUI hides, USB debugging is the best way to do it, which allows you to “question” the power controller directly through the computer’s command line.
You will need to enable the developer mode on the Redmi Note 8 Pro. To do this, go to Settings → About Phone and quickly click on the MIUI build number 7 times. Then activate “Debugging by USB” in the “Additional” menu.
Connect your smartphone to your PC and launch it ADB-Enter a command to read the battery properties file:
adb shell dumpsys batterystats | moreIn the lead, look for lines that contain Current charge and Design capacity, the difference between them will show real wear and tear. /sys/class/power_supply/battery/capacity to obtain current status.
This method is considered the most reliable among software, since it reads raw data from the power management chip, bypassing the software optimization filters MIUI.
⚠️ Attention: For work ADB Drivers must be installed on the computer ADB And Fastboot. Without them, the computer won't see the smartphone in debugging mode.
If you don’t want to mess with the command line, there are graphical shells for ADB, such as Xiaomi ADB/Fastboot Tools, that can read this data in a more convenient way.
Wear analysis through third-party applications
If you mess with codes and ADB laziness, you can use specialized applications, but it is worth remembering that Android restricts applications from accessing the system data of the battery for security purposes.
One of the best solutions is AccuBattery, which doesn't show instant results, but it collects statistics as you go about it. You have to charge the Redmi Note 8 Pro several times to get the app to calculate the actual capacity.
Other useful utilities:
- 📱 CPU-Z — Battery tab will show technology (Li-Po), voltage and temperature.
- 🔍 Ampere – Measures charge and discharge current, helping to identify controller issues.
- 📊 Battery Guru – analyzes charging habits and cell health.
The main disadvantage of software methods is that they show the calculation data, and if the battery controller (BMS) is calibrated incorrectly, the applications will show incorrect information.
💡
For accurate data calibration in applications, spend a full cycle: discharge the phone before turning off (0%), then charge to 100% and hold on charging for another hour.
Table of normal indicators for Redmi Note 8 Pro
To know if you should be concerned, you need to compare the data with the reference values, and here is a table that will help you interpret the results.
| Parameter | Norma (New) | Permissible wear and tear | Critical condition |
|---|---|---|---|
| Capacity (mAh) | 4400-4500 | 3600-4000 | Less than 3,000 |
| Charge cycles | 0-50 | 300-500 | More than 800. |
| Tension (rest) | 3.7-4.2 Including | 3.6-3.8 Including | Below 3.5 B |
| Temperature (load) | 35-40°C | 40-45°C | Above 50°C. |
Note the temperature.The Redmi Note 8 Pro is known for its Helio G90T processor heating. If the battery heats above 45 degrees in normal mode, it accelerates the degradation of chemistry.
Critical is the condition when the actual capacity falls below 70% of the factory (less than 3150 mAh), which leads to unstable operation of the processor and sudden shutdowns.
Effect of fast charging on battery life
The Redmi Note 8 Pro supports 30W fast charging technology. While convenient, high charging currents contribute to faster heating and, as a result, accelerated aging of lithium cells.
If you've used fast charging since the first day of purchase, battery wear by the third year can be 25-30%. It's a natural process, but it can be slowed down.
Recommendations for extending the life of the battery:
- 🌡️ Try not to overheat the body above 40°C during charging.
- 🔌 Use the original cable and power supply with support QC 3.0/4.0.
- 🚫 Do not play heavy games while charging, so as not to add up the heat from the processor and the charge current.
- 🔋 Try to keep the charge in range 20-80%, avoiding full cycles 0-100%.
💡
The fast 30W charge on the Redmi Note 8 Pro is safe when using original hardware, but heating is the main enemy of battery durability.
Also worth mentioning is MIUI’s Optimized Night Charging feature, which trains your sleep patterns and charges the last 20% of capacity just before you wake up, reducing battery life at 100% charge.
When a battery replacement is needed
If the diagnostics show critical wear, no software calibration will help. The chemical resource is exhausted, and the cell can't store energy.
Signs that it is time to change the battery:
1. Bloating of the body or detachment of the back cover. This is the most dangerous sign that requires immediate access to the service.
2. the phone is turned off in the cold or at start-up