How to know exactly how to wear the battery on a Xiaomi smartphone: from hidden menus to engineering codes

The battery is the most vulnerable component of any smartphone, and Xiaomi is no exception. Over time, battery capacity inevitably declines: after 300 to 500 charging cycles, you may notice that the phone discharges 1.5 to 2 times faster than after you buy it. But how do you accurately measure wear and tear without having to disassemble the device or visit a service center?

Many users are guided by subjective feelings ("he used to hold two days, and now barely reaches the evening"), but this does not give an objective picture. MIUI several tools for battery diagnostics - from engineering menus to special USSD-In this article, we will discuss all working methods for checking wear, including those that do not require root rights or install third-party applications.

It's important to understand that even if a smartphone shows "90 percent battery health," it doesn't always mean that it lost 10 percent of capacity. Manufacturers often use adaptive calibration algorithms that can overstate or understate the actual numbers, so it's better to combine multiple methods to make a precise diagnosis.

If your Redmi Note 10, POCO X3 or Mi 11 is running out quickly, don't be quick to blame the firmware or background processes. Check the battery first, maybe it's time to replace it. We'll help you do it as accurately as possible.

The fastest way to get basic battery information is to use the hidden engineering menu available on all Xiaomi smartphones without root rights, which works on devices with MIUI 12-14 and most Redmi/POCO models (except for the newest flagships with highly customized software).

To open the menu:

Open the Phone app (standard calling module).
Enter the combination: ##4636###.
In the window that appears, select Battery Information.

Here you are interested in two key parameters:

🔋 Level of charge (level) – current percentage in digital form (may differ from the status bar icon).
📊 Health status – Good, Unknown or percentage of wear and tear (e.g. Health: 85) may be indicated here%).

⚠️ Note: Some Xiaomi models (e.g. Redmi) 9A or POCO M3) The Health field can be displayed as Unknown. It's not a mistake, it's just the manufacturer has blocked the output of this information.

If you are lucky and the menu shows the percentage of wear, focus on the following thresholds:

🟢 90-100% battery in excellent condition.
🟡 80-89% - a noticeable decrease in capacity, it is worth thinking about replacing.
🔴 Below 80% - critical wear, replacement is recommended.

📊 How often do you check the health of your battery?

Once a month

Only when the problems start.

Never checked.

I don't know how to do that.

2.Use of USSD-battery-diagnostic

Xiaomi has integrated several service services into the firmware USSD-These codes work on most models, but can be disabled on devices with advanced battery information. MIUI Global Stable (especially on the flagships of the Mi or Xiaomi series) 12/13).

Try the following combinations (enter in the standard Phone app):

📱 ##6484## - Battery test (shows voltage, temperature and approximate wear).
🔍 ##64663## - Advanced diagnostics (may give an error) MTK Engineer Mode if the processor is not MediaTek).
⚡ ##44336## - information about the charger and charging current (indirectly helps to assess the state of the battery).

After entering the code ##6484##, you will see a table with the following parameters:

Parameter	Meaning	What does it mean?
MB_06	3800–4500	Current battery capacity in mAh (compare with the passport capacity of your model).
Voltage	3.7–4.2 V	Voltage: Normal: 3.8-4.1 V at 50-80% charge.
Temp	25–40°C	Temperature: above 45°C, a sign of degradation or overload.

If the actual capacity (MB_06) less passport 20% And more -- the battery is very worn out. 11 passport-capacity 5000 mh MB_06 = 4000 wear-out ~20%.

💡

If USSD-If the codes don't work, try typing them without the last star (e.g. ##6484## instead of ##6484.

3. Battery analysis applications: AccuBattery and AIDA64

If standard methods fail, third-party utilities will come to the rescue. The two most reliable battery diagnostic apps on Xiaomi are AccuBattery and AIDA64. They don’t require root rights, but they require multiple charging/discharge cycles to get accurate data.

AccuBattery (Free on Google Play):

📉 Shows the real capacity of the battery (in mAh) and the percentage of wear.
🔄 Tracks charging cycles and degradation rate.
⚡ Analyzes charging current and temperature.

⚠️ Attention: AccuBattery requires calibration – after installation, charge the phone to 100% and discharge to 0% (no recharging.

AIDA64 (paid version on Google Play):

🛠️ Shows battery technology (Li-Po, Li-Ion), manufacturer and production date.
📊 Provides advanced information about stress, temperature and health status.
🔧 It works even on devices with blocked engineering menus.

Example of data from AIDA64 for POCO F3:

Battery:




Technology: Li-Polymer




Capacity of the project: 4520 mAh




Current capacity: 4100 mAh (depreciation ~9%)




Voltage: 3.89 V




Temperature: 32°C




Status: Good




Manufacturer: ATL (Amperex Technology Limited)

Turn off battery optimization for the application | Charge phone to 100% |Discharge to automatic shutdown |Repeat cycle 2-3 times for accuracy-->

4. Verification through ADB: method

If you want the most accurate data, you can use ADB (Android Debug Bridge), which requires connecting the phone to a computer, but gives you access to hidden battery settings that standard tools don't show.

Instructions:

Install. ADB-PC drivers.
Enable USB debugging on your phone: go to Settings → About Phone → MIUI version (click 7 times to activate Developer Mode), then to Settings → Additional → For Developers → Debugging over USB.
Connect your phone to your PC and type in the command line: adb shell dumpsys battery

In the commands output, look for the following parameters:

🔋 Capacity - current capacity in percentage (not always accurate).
⚡ Voltage - voltage (for example, voltage: 3987 = 3.987 V).
📊 health condition (2) = Good, 3. = worn-out).
🔄 cycle_count — Number of charging cycles (if available).

Example of output for a worn-out battery:

health: 3




voltage: 3701




temperature: 340 (34°C)




capacity: 78

Here health: 3 means critical wear and capacity: 78 means that the battery has lost ~22% capacity.

What to do if ADB doesn't cycle_count?

If there is no data on charging cycles in the adb shell dumpsys battery output, this means that MIUI firmware blocks access to this information. Alternatively, use the Battery Guru application (requires root) or contact a service center for diagnostics on specialized equipment (for example, the ZXW Tool or Medusa Pro).

5.Visual signs of battery wear

Even without special tools, you can suspect problems with the battery on indirect grounds. If you notice at least 2-3 items from the list below, the probability of wear is 80% or more:

🔥 The phone gets very hot when charging or under load (even if it wasn’t before).
⚡ Charging is jerky: it quickly gains interest, then “freezes” on one value.
📉 Battery discharges by 20-30% per hour in standby mode (without active use).
🔌 The phone turns off at 10-20% charge, although it used to work to 0%.
📱 The case swelled (especially noticeable if you put the phone on a flat surface and spin - it will "swing»).

Critical sign: if the phone suddenly turns off at 30-50% charge, it means that the battery controller is not calibrating the residual capacity correctly, in which case the battery replacement is mandatory - further operation may lead to damage to the motherboard.

To check for battery bloating:

Put the phone down on a flat table.
Lightly press the center of the back cover.
If the body “plays” or under the finger feels a bulge – the battery is swollen.

💡

A bloated battery is not only a loss of capacity, but also a risk of damage to the screen or motherboard. If you notice a deformation of the case, immediately turn off the phone and contact the service!

When it is time to change the battery: table of recommendations

To make an informed decision about replacing the battery, focus on this table:

Indicator.	Norma.	Warning	Critical wear and tear
Capacity (from passport)	90–100%	80–89%	< 80%
Voltage (at 50% charge)	3.8–4.0 V	3.5–3.7 V	< 3.5 V
Temperature in plain	25–35°C	36–45°C	> 45°C
Working hours (average load)	1.5–2 days	8:12 hours	< 6 hours
Number of charging cycles	< 300	300–500	> 500

If your smartphone falls into the "Critical Wear" column, a battery replacement is inevitable.

🔌 Damage the power controller (repair costs 3-5 times more than replacing the battery).
📱 Disable the screen (a bloated battery presses on the display, causing "spots" or cracks).
💥 Induce fire (rarely, but possible for mechanical damage).

FAQ: Frequent questions about Xiaomi battery wear

❓ Can I reset the charge cycle meter after replacing the battery?

No, the charging cycle counter is only reset when the phone is completely flashed through the Fastboot or the motherboard is replaced, but this does not affect the real state of the new battery - just the statistics in applications (for example, AccuBattery) will start from scratch.

❓ Why the Engineering Menu Shows “Health: Unknown"?

This means that MIUI firmware blocks the output of battery health information, a common feature found on Qualcomm Snapdragon processor devices (such as Xiaomi 11T or POCO F4), in which case use ADB or AIDA64.

❓ How often should the battery be calibrated?

Calibration (full charge/discharge cycle) is recommended every 3 months, which helps the battery controller to more accurately display the level of charge. Calibration: Charge the phone to 100% and hold on charging for 1-2 hours. Discharge until automatic shutdown. Charge again to 100% without interruptions. Don't calibrate the battery more often - this accelerates its wear.

❓ How much does it cost to replace a battery in the service center Xiaomi?

Cost depends on the model: Redmi 9A/10A: 1 500–2 500 ₽. POCO X3/X4: 2 500–3 500 ₽. Xiaomi 11/12/13 series: 4 000–6 000 ₽ (The original batteries last longer, but they are on the same scale. 30–50% Always make sure that the service uses a battery with the right item (for example, for the Redmi Note). 10 Pro. MBJ4072).

❓ Can I restore the capacity of the worn-out battery?

No, it's impossible to restore the original capacity of a lithium polymer battery. All the miracle methods (freezing, flashing the controller, using special chargers) are myths. The only way to restore the phone to its former autonomy is to replace the battery. However, further degradation can be slowed down: 🔌 Avoid charging to 100% (it is optimal to keep the level of 20-80%). 🌡️ Do not use your phone at temperatures below 0.°C or higher than 40°C. ⚡ Turn off fast charging if it heats the battery too much.