Xiaomi, Redmi and POCO are all known for their energy efficiency, but over time, any lithium polymer battery inevitably loses capacity. Users often notice that a device that used to live quietly into the evening now requires charging by lunchtime, the first signal that a diagnostic of the power grid is needed.
There are many ways to assess battery health, from built-in system utilities to complex engineering codes. It is important to understand that software testing does not always give a 100% guarantee, but it can identify critical deviations in the operation of the power controller. In this article, we will discuss all available methods so that you can make an informed decision about the replacement of the battery.
Symptoms of wear and primary diagnosis
Before running complex tests, it is worth doing a visual and behavioral analysis of how a smartphone works. Physical wear often manifests itself not only in reducing battery life, but also in unstable behavior of the device under load. If the phone suddenly turns off when charged 20-30%, this is a clear sign of cell degradation.
Pay attention to the charging speed. If the energy recharge process takes significantly longer than the specification stated, or if the device is heated at the top of the housing, this may indicate problems with the charge controller or the battery itself.
⚠️ Warning: If you notice that the smartphone body has begun to deform or the screen has risen, immediately stop using the device.The bloated battery is fire-prone and requires immediate replacement at the service center.
It’s also worth checking the usage statistics in settings: Sharp jumps in energy consumption by specific applications can mask the real battery problem, creating a false impression of a quick discharge.
Using the CIT Engineering Menu to Check
The most reliable built-in diagnostic tool is the Customer Interface Test (CIT) mode, which allows you to test all hardware components of a smartphone, including the battery, without installing third-party software. To enter this mode on most Xiaomi devices, you need to enter a special code in the Phone application.
Dial the combination ##6484## or ##64663#. If the code works, the list of tests will open. Find the item associated with the battery (usually called Battery info or Battery test) Here you can see the current parameters: voltage, temperature and connection status.
☑️ Diagnosis in CIT
You can often see Battery Status status on this menu, and if it says "Good," it means that the controller doesn't detect critical errors, but this test doesn't show the actual residual capacity as a percentage of the factory capacity, it just confirms that the circuit is working.
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If the code doesn’t work, try entering it through Google’s Phone app or the standard MIUI typer. On some global firmware versions, CIT access may be restricted.
Analysis through the engineering menu and code ##4636##
Another powerful tool available on Android is the testing menu, enter the code ##4636## in the dialer. After you click, select Battery Information, which is more technically presented here.
You should be interested in Battery Health and Battery Level settings. CIT, Here, sometimes (but not always) you can see more detailed logical information about charge cycles, if the manufacturer left this feature open. POCO This method is the main one for quick checks.
| Parameter | Normal value. | Critical significance | Description |
|---|---|---|---|
| Battery Health | Good | Overheat / Dead | General condition of the food supply |
| Voltage | 3.7V - 4.4V | < 3.4V / > 4.5V | Current voltage at the terminals |
| Temperature | 25°C - 40°C | > 45°C | Heating temperature during operation |
| Scale | 100 | - | Maximum charge scale |
If you see the voltage falling too quickly even in plain, it is a sure sign of capacity loss.
What to do if the code does not open?
Third-party applications for accurate diagnosis
Staff often hide detailed information, and it is better to use specialized software to get accurate data on recharge cycles and real capacity, and AccuBattery is considered the leader in this field.
The principle of operation of such programs is based on the analysis of charging and discharging speeds. To get an accurate result, you need to run the smartphone after several cycles: charge to 100% and discharge to 15-20%.
Also worth looking at are the Ampere or Battery Charge Limit apps, which allow you to control charge current and limit the maximum charge level, which is useful for extending battery life in the future, but AccuBattery is best suited for the initial wear diagnosis thanks to its statistics.
Don’t trust cleaner apps and boosters that promise to restore the battery programmatically. This is physically impossible: chemical wear and tear cannot be reversed by software code.
Checking through ADB and computer
For advanced users who are not afraid of the command line, there is a method of checking through Android Debug Bridge (ADB), which gives access to system files where battery information is stored, even if it is hidden in the interface.
You'll need a computer, USB-cable and installed drivers ADB. Connect your smartphone, turn on debugging USB In the “Developers” menu and execute the command:
adb shell dumpsys batteryYou'll get a detailed log, look for the lines level, status, and health, and you can do a deeper analysis by reading files in the directory. /sys/class/power_supply/battery/, But it requires root rights.
⚠️ Attention: Use ADB-Incorrectly entering commands with the prefix "set" can change the behavior of the system, so use only the commands "get" or "dumpsys" for diagnosis.
This method is especially useful if the touch screen is damaged and you can’t use the settings menu fully, but the system works.
Visual examination and bloating check
Software methods are good, but the physical state of the battery often speaks more than any number. Battery bloating is the most dangerous symptom that can't be ignored. Gases released by a chemical reaction inside the cell burst the body.
How to check: put your smartphone on a flat surface with your screen down and try to spin it. If the device spins like a top or staggers, then the back cover (or screen if the case is glass) is bent outwards, and you can also see glowing spots (lights) on the edges of the display due to pressure on the matrix.
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The bloated battery cannot be pierced or subjected to mechanical action - this will lead to ignition of the electrolyte and fire.
If you find bloating, no calibration or application will help. You need to replace it immediately. Operating this device can damage other components, including the motherboard, due to pressure on the plumes.