Why it is important to monitor the battery status of Xiaomi
The battery is the most vulnerable component of any smartphone, and Xiaomi devices (including Redmi and POCO sub-brands) are no exception. Over time, the battery capacity inevitably decreases: after 300-500 charging cycles, it loses 20-30% of its original volume, and after 2-3 years of operation, degradation can reach 50% or more, leading to a sharp reduction in battery life, spontaneous shutdowns with low charge and even the risk of battery bloating.
The problem is that MIUI (Xiaomi firmware) doesn't show the exact residual capacity of the battery by default - only an approximate percentage of charge.
- 🔋 Predict the life of the device and schedule battery replacement in advance.
- 📉 Identify abnormal wear (for example, if the capacity fell by 40% in a year – this is a sign of defective or improper exploitation).
- 💰 Estimate the market value of the smartphone when selling (battery with a capacity below 80% reduces the price by 15-25%).
- ⚡ Optimize charging if the battery degrades faster than normal (for example, due to overheating or the use of unoriginal RAM).
In this article, we will discuss all working ways to check the residual capacity on Xiaomi smartphones, including hidden engineering menus, ADB-Instructions are relevant for 2018-2026 models (from Redmi Note 7 to Xiaomi 14 Ultra) and firmware MIUI 12–14.
Method 1: Engineering menu #4636## - Quick diagnostics
The easiest method is to use a hidden engineering menu available on all Xiaomi smartphones without root rights, which provides basic battery information, including wear and tear level (if supported by the model).
To open the menu:
- Open the Phone app.
- Enter the combination: ##4636### (some models may require ##6484## or #64663###).
- Select Battery Information (Battery Information).
In the window that opens, pay attention to the following parameters:
- 🔢 Level - current charge in percentage (not to be confused with capacity!).
- ⚡ Voltage - battery voltage (normal: 3.7-4.4 V for Li-Pol batteries).
- 🔋 Health - battery status (if any) Values: Good - less than 10% wear; Unknown - data inaccessible (need another method); Dead - critical wear (replacement required).
⚠️ Note: On new Xiaomi models (e.g. Xiaomi) 13/14, Redmi Note 12) Health may not be available. In this case, use ADB-method.
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If the engineering menu doesn't open, try entering the code through the Calculator app: dial a sequence of numbers (e.g., 4636) and press =. On some firmware, this works.
Method 2: ADB-Commands – Accurate data without root
The Android Debug Bridge (ADB) method is suitable for all Xiaomi models and provides the most accurate data, including the real capacity per mAh and the number of charging cycles. It does not need root rights, but you will need a computer (Windows, macOS or Linux).
Step-by-step:
Enable debugging by USB in the developer settings | Install ADB drivers on PC | Download ADB Tools | Connect your smartphone to your PC over USB
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- Activate Developer Mode: Go to Settings → About Phone and 7 times click on the MIUI Version. Return to the main settings menu and the Developer option will appear.
- Enable USB debugging: In Settings → For developers, activate USB debugging and confirm the resolution.
- Connect your smartphone to your PC: Use the original cable. A request for debugging permission will appear on the phone screen — confirm (Always Allow).
- Launch it. ADB and enter the commands: adb shell dumpsys battery In the conclusion, find the lines: capacity - current charge in the battery %; charge_counter — real residual capacity in mkAh (divided by 1000, To get mAh; voltage; temperature; battery temperature (normal: 25–40°C).
Example output for Redmi Note 10 Pro with 5020 mAh battery:
charge_counter: 3890000 (≈ 3890 mAh]
voltage: 4100 (mV)
temperature: 320 (32°C)In this case, the wear will be: (5020 - 3890) / 5020 × 100% ≈ 22.5%.
⚠️ Attention: If the value charge_counter overestimated (for example, 6000 mAh battery 4000 mAh), this may indicate a meter reset after firmware.
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ADB-The method shows the most accurate residual capacity, but requires a computer. For regular checks, it is more convenient to use applications (method 3).
Method 3: Diagnostic applications – convenient, but not always accurate
If you don't want to connect your smartphone to your PC, you can use third-party apps that analyze data from the battery controller and output information in a convenient way, but the accuracy depends on the model — on some devices, the apps only show approximate values.
The best programs for Xiaomi:
| Annex | precision | Need root? | Features |
|---|---|---|---|
| AccuBattery | ⭐⭐⭐⭐ | ❌ No. | It shows wear, temperature, charging history, and is suitable for most Xiaomi models. |
| CPU-Z | ⭐⭐⭐ | ❌ No. | It displays capacity, voltage, battery technology, and it can be updated with a delay. |
| Battery Guru | ⭐⭐⭐⭐ | ❌ No. | It monitors charging cycles and predicts lifespan. It has a widget for quick access. |
| AIDA64 | ⭐⭐⭐⭐⭐ | ✅ Yes (for full data) | Shows the actual capacity in mAh, voltage, temperature and even the date of production of the battery. |
Instructions for AccuBattery (the most popular application):
- Download and install AccuBattery from Google Play.
- Open the app and go to the Health tab.
- Wait for the application to collect data (it may require 1-2 charging cycles).
- Pay attention to the parameter Capacity assessment - this is the residual capacity in mAh.
Instructions with USB-tester:
- Discharge your smartphone before automatically shutting down (0%).
- Connect. USB-Tester between charger and phone.
- Charge the phone to 100%, recording the tester, and it will show the real capacity in mAh, which could take the battery.
- Compare it to passport capacity (for example, Xiaomi 11T Pro is 5000 mAh).
Example of calculation:
Passport capacity: 5000 mAh
Actual (tester): 3950 mAh
Wear:
21%
⚠️ Warning: When disassembling the phone for direct multimeter measurement, do not touch the metal parts with a screwdriver - this can cause a short circuit!
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If you don't. USB-You can use a power bank with a display (e.g. Xiaomi Mi Power Bank 3) to completely drain the phone, then charge it from the power bank to 100% and see how much mAh was given away.
Method 5: Hidden Test Menu for Qualcomm Models
Xiaomi smartphones on Qualcomm Snapdragon processors (most Redmi and POCO models) have a hidden testing menu where you can see detailed information about the battery, including the number of charging cycles and the real capacity.
How to open it:
- Open the Phone app.
- Enter the code ##36446337## (for some models, #3644633### works).
- Select Battery Information.
On this menu you will see:
- 🔋 Battery Capacity – current capacity in mAh;
- 🔄 Charge Cycles – Number of complete charging cycles;
- 🌡️ Temperature - Temperature;
- ⚡ Voltage - voltage.
Examples for the Redmi Note 9 Pro:
Battery Capacity: 4850 mAh (from 5020 mAh)
Charge Cycles: 214
Temperature: 34°C
Voltage: 4.35V⚠️ Note: On models with Mediatek processors (e.g. Redmi) 10A, POCO M4 Pro) this menu may be missing or show incomplete data. ADB.
How to interpret results: Normal and critical condition
Once you get the residual capacity data, it is important to correctly assess them. Below is a table of standard wear values for lithium polymer batteries in Xiaomi smartphones:
| Battery wear and tear | Residual container | Status. | Recommendations |
|---|---|---|---|
| 0–10% | 90–100% | ✅ Excellent. | The battery is almost new. Keep operating as normal. |
| 10–20% | 80–90% | ⚠️ Satisfactory | Battery life has been reduced by 10 to 20 percent. Watch the battery temperature. |
| 20–40% | 60–80% | ⚠️⚠️ Critical | The phone runs out in 3-4 hours, and battery replacement is recommended. |
| 40%+ | <60% | ❌ Emergency. | Replace the battery at the service center immediately. |
Additional signs of critical wear:
- 🔥 Phone overheats when charging or under load (games, video).
- ⚡ Charge drops from 30% to 0% in 5-10 minutes.
- 📵 The device turns off on its own at 15-20% charge.
- 🔋 The body swelled (seen by the gap between the screen and the frame).
If your Xiaomi falls into the 40 percent+ wear category, don’t delay battery replacement. Modern lithium-polymer batteries can:
- 💥 Blow up and damage the screen or motherboard;
- 🔥 Overheating and causing a fire (rarely, but possible);
- 📵 Disable the power controller, which will require expensive repairs.
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If the residual capacity is below 60%, and the phone is used daily - it is better to replace the battery within 1-2 months. the cost of replacing in the Xiaomi service center starts from 1,500 rubles (for Redmi models) and up to 5,000 rubles (for Xiaomi flagships 13/14).