The battery is one of the most vulnerable spots in the Xiaomi Redmi 8, especially after 2-3 years of active use. Even if the smartphone looks like a new one, the worn-out battery can reduce the operating time by 2-3 times, cause sudden shutdowns with 20-30% charge or overheat during charging. Fortunately, you can check its condition without special tools - just know the hidden functions of MIUI and several engineering commands.
In this article, we will discuss 5 working methods of battery diagnostics at Redmi 8 (including Redmi models 8A redmi 8A Dual, from standard settings to professional utilities, you'll learn how to determine real wear in percentage, check charging cycles, and even identify an "blown" battery early. MIUI 12-14 and do not require root rights.
1. Built-in battery statistics in MIUI: quick check
The easiest way to assess the status of the battery is to use the built-in MIUI tools. They will not show the exact percentage of wear, but will help to identify obvious problems: rapid discharge, overheating or improper operation of the charging controller.
To open up the statistics:
- Go to Settings β Battery and Performance.
- Slip on the icon "Battery" (or "Battery Use" in older versions).
- Select the tab "Statistics" or "Battery status".
Please note here:
- π Chart discharge: if the smartphone loses 10-15% Charge per hour in standby mode - the battery is critically worn out.
- β‘ Temperature: values above 40Β°C when charged or loaded indicates degradation of elements.
- β±οΈ Time of work: if screen time has decreased 6-8 hourly 2-3 β time to think about replacement.
β οΈ Attention: B MIUI 14 and newer statistics can be reset after rebooting. To get accurate data, do not turn off your smartphone for at least 24 hours before checking.
2. Hidden engineering codes for battery diagnostics
For a deeper check, use the service USSD-These commands work on all Redmi 8s regardless of the firmware version, but require caution β donβt change settings unless youβre sure theyβre in use!
The basic codes for Xiaomi Redmi 8:
| Code. | Appointment | What to look for in the results |
|---|---|---|
| ##4636## | Test menu | The tab "Battery Information" β the parameters of level (current charge), voltage (voltage), temperature. |
| ##6484## | Battery test | Shows real capacity in mAh (compare with passport 5000 mAh). |
| ##64663## | MTK Engineering Menu | For Helio G80 processors (Redmi 8 is not used, but the code may work on some modifications). |
How to interpret the results:
- π Voltage: Normal for Redmi 8 - 3.7-4.2 V. Values below 3.5 V at 20% charge indicate wear and tear.
- π₯ Temperature: above 45Β°C - critical overheating, replacement is required.
- π Capacity: If the actual value is less than 3500 mAh, the battery is worn out by 30% or more.
π‘
If nothing happens after entering the code, try typing it in the standard Phone app, not through the keyboard in the menu.
3. Detailed diagnostic applications: AccuBattery and AIDA64
Standard MIUI tools provide limited information. Use third-party tools for accurate analysis. The best options for Redmi 8 are:
AccuBattery (Free on Google Play):
- π Shows the actual battery capacity after 2-3 charge-cycle.
- β‘ Analyzes charging/discharge speed and temperature.
- π Tracks charging cycles (normal β up to 500 cycles for Li-Pol batteries).
AIDA64 (paid version):
- π οΈ Detailed information about the battery controller and its firmware.
- π History of tension and temperature in the last day.
- π Possibility of exporting reports for comparison with reference values.
β οΈ Attention: Annexes of type CPU-Z or 3C Battery Monitor may show incorrect data on Xiaomi due to restrictions MIUI. For accuracy, use only proven utilities.
βοΈ Preparation for battery testing
4. How to check battery wear through ADB (for advanced users)
If you want the most accurate data, including the number of charging cycles and factory capacity, use ADB (Android Debug Bridge), which requires connecting your smartphone to a PC, but provides information that is not available through standard means.
Instructions:
- Install ADB Tools on your computer.
- Enable USB debugging on Redmi 8: Settings β About Phone β MIUI Version (tap 7 times), then Settings β Additional β For Developers β Debugging on USB.
- Connect your smartphone to your PC and execute the command: adb shell dumpsys battery
Key parameters in the conclusion:
- Capacity is the current capacity in mAh.
- Voltage - voltage (should be 3.8-4.2 V at 100% charge).
- Temperature is a temperature in tenths of a degree (for example, 325 = 32.5Β°C).
- charge_counter β amount of charge consumed for all time (in ΞΌAh).
How to calculate the wear of the battery charge_counter?
5. Physical inspection: how to detect a "blown" battery
If the Redmi 8 is not lying well on the table, the screen is raised or the body is deformed, these are signs of a βbloatedβ battery, which should be replaced urgently, as it can damage the internal components or even ignite.
How to check:
- Put the smartphone on a flat surface with the screen up.
- With a light press, check if the body does not "play" on the edges (especially near the camera).
- Illuminate the flashlight at the junction of the screen and the case - if a gap is visible, the battery is swelling.
Additional features:
- π Extraneous sounds (squeaking, crackling) when pressing the body.
- π Rapid charge drop from 100% to 80% and slow discharge.
- π₯ Overheating even with minimal load.
β οΈ Warning: If the battery is swelling, do not attempt to pierce or bend it, it may cause fire.
π‘
Even if the battery looks normal, it could drop to 60-70% of the factory capacity, and regular testing through apps or ADB can help avoid sudden problems.
6.What to do if the battery is worn out: replacement or calibration?
If your diagnosis shows wear and tear of more than 30%, you have two options:
Battery calibration (can help with a "downed" controller):
- π Discharge your smartphone before automatically shutting down.
- β‘ Charge up to 100% without interruptions (use the original adapter).
- π Repeat the cycle 2-3 once.
Replacement of the battery (optimum option for physical wear):
- π οΈ The original battery for the Redmi 8 has an articular MBJ405690 (5,000 mAh).
- π° Replacement cost in the service center: 1500-2500 rubles (with work).
- β οΈ Do not buy cheap analogues - they may not match the declared capacity.
If you are replacing the battery yourself, consider:
- π§ You will need a plastic shoulder blade and a hair dryer to soften the glue.
- π Battery glued to the body - do not pull the plume!
- β‘ After replacement, complete a full charge cycle (0β100%) for calibration.