How to see the battery size on Xiaomi: nominal capacity vs real wear

Battery checks are critical for Xiaomi, Redmi and POCO smartphone owners. Over time, lithium-ion batteries degrade: their rated capacity (shown on the case) and actual capacity (residual after wear) can vary by 20-40%, which directly affects battery life, charging speed and even device safety. For example, a battery with a wear of 50% can suddenly turn off at 30% charge or overheat during fast charging.

In this article, we will discuss 5 proven ways to find out the battery size on Xiaomi – from built-in tools MIUI You will learn how to distinguish the nominal capacity (e.g., 5000 mAh per box) from the current capacity (e.g., 4200 mAh after a year of use), and learn how to interpret data on charging cycles and health (Battery Health). All methods are tested on devices with MIUI 12-14 and Android 10-14.

I want to know the actual battery wear.|Planning a battery replacement.|The phone's running out fast.|Just out of interest.|Another option-->

Method: Integrated MIUI diagnostics (without root)

The easiest and safest method is to use the hidden MIUI diagnostics menu.It works on most Xiaomi, Redmi and POCO models without having to install additional apps or obtain superuser (root) rights.

Instructions:

1. Open the Phone app.
2. Enter the combination: ##4636### (on some models it may not work – see the alternatives below).
3. In the menu that appears, select Battery Information.
4. Pay attention to the lines: 🔋 Level of charge (level) - current percentage. 📊 Health status – can be displayed as Good, Unknown or percentage of wear and tear. ⚡ Capacity - the actual capacity in mAh (if displayed).

⚠️ Attention: On new versions MIUI 13-14, this code can be blocked. Alternatively, use the combination ##284## (battery test) or ##6484## (engineering menu.

Charge the phone to 100%|Disable all background apps|Check the temperature of the body (should be) ≤ 35°C)|Use the original cable for accurate data-->

2. Method: Application "Security" (MIUI Security)

Xiaomi’s proprietary Security app has a built-in battery monitoring tool that shows not only current wear, but usage statistics, temperature, and even life extension recommendations.

How to find it:

1. Open the Security app (the shield icon).
2. Go to Optimize or Accelerate (name depends on the version of MIUI).
3. Slip on the Battery icon (usually at the top of the screen).
4. Select Battery Health (Battery Health) status.

Here you'll see:

• 📉 Battery wear – Percentage of capacity loss (e.g., “Wear: 15%” means 85 of the face value is left%).
• 🔄 Charging cycles – how many times the battery has been fully discharged and charged (normal – up to 500 cycles).
• 🌡️ Temperature - optimal range of 20-35°C.

Important: If the battery status section displays a message "No data", then your model does not support this function. In this case, use third-party utilities (mode 4).

💡

If the battery wears more than 30%, consider replacing it. If it wears more than 50%, the battery can suddenly shut down even at 20-30% charge.

Method 3: Engineering Menu (MTK and Qualcomm)

For advanced users, there is a method using an engineering menu that is suitable for smartphones powered by MediaTek (MTK) and Qualcomm Snapdragon chips, but requires caution - wrong actions can lead to crashes.

Instructions for MediaTek:

1. Open the Phone app.
2. Enter the code ##36446337## (or #3644633## on some models).
3. Go to the Battery section.
4. Pay attention to the parameters: 🔋 BAT Capacity - Current Capacity. 📊 BAT Health - state of health (B %). 🔄 Charge Counter - Charge Counter.

Instructions for Qualcomm Snapdragon:

1. Enter the code: ##4636###.
2. Select Battery Information.
3. Scroll down to the Battery History block - a wear graph can be displayed here.

⚠️ Note: Do not change any parameters in the engineering menu unless you are sure of their purpose. For example, a battery reset may cause an incorrect display of the battery level.

Method: Third-party applications (AccuBattery, CPU-Z)

If the built-in MIUI tools don't show battery capacity, third-party utilities will come to the rescue, the best of which are AccuBattery and CPU-Z. They work without root rights and are compatible with most Xiaomi models.

AccuBattery (recommended):

• 📊 Shows real capacity after 2-3 charging cycles.
• 📉 Tracks wear and predicts the remaining service life.
• ⚡ Monitoring the charging/discharge rate.

How to use:

1. Install AccuBattery from Google Play.
2. Charge the phone to 100% and wait for calibration (may take 1-2 cycles).
3. In the Health section, look at the current capacity.

CPU-Z (alternative):

• 🔧 Shows nominal capacity (from factory data).
• 📱 It works without calibration, but does not display wear.

Where to watch:

1. Open the CPU-Z and go to the Battery tab.
2. Find Capacity, where the rated capacity is indicated (e.g., 5020 mAh for the Redmi Note 12 Pro).

⚠️ Note: Apps like AccuBattery take time to collect data. If you just install a program, wait for at least one full charge cycle (0–100%) for accurate readings.

5. Method: ADB-Teams (for advanced users)

If you're familiar with ADB (Android Debug Bridge), you can get your battery data directly from the system, which is more accurate than third-party applications, but requires a PC connection.

Instructions:

1. Enable USB debugging in the developer settings (Settings → About Phone → MIUI version – tap 7 times, then go back to Additional settings → For Developers).
2. Connect the phone to the PC and open the command line (cmd).
3. Enter the command: adb shell dumpsy battery
4. Find in the output line: capacity - current level of charge (%). charge counter - the remaining charge in μA·h (divided by 1000 to get mA·h). health - state (2 = good, 3 = bad).

Example of conclusion:

level: 85




scale: 100




health: 2 (Good)




charge counter: 3400000 (3400 mAh)




technology: Li-ion

⚠️ Note: The charge counter value may be reset after a firmware reboot or update. For accurate data, use it paired with AccuBattery.

💡

If the actual battery capacity is less than 80% of the nominal capacity, it is recommended to replace it, for example, for a battery of 5000 mAh, the critical threshold is 4000 mAh.

6. Method: Disassembly of the phone (extreme case)

If the software methods don’t work (e.g., on very old Xiaomi models), you can physically inspect the battery, which is only suitable for advanced users, as it requires disassembling the device and violates the warranty.

How to check:

1. Turn off the phone and remove the back cover (on removable battery models, such as the Redmi 4A).
2. On the battery case, find the label with a capacity (for example, 4850 mAh or TY48 is the model code).
3. Compare it to the nominal capacity of the specifications.

⚠️ Note: Modern Xiaomi smartphones (e.g. Xiaomi 13 or Xiaomi) POCO F5) They have non-removable batteries, and if you try to remove them without special tools, you can damage the plumes or the display.

Comparison of methods: which one to choose?

The choice of method depends on your Xiaomi model and the goals:

• 📱 For quick check: Use the built-in ##4636## menu or the Security app.
• 🔍 For detailed diagnosis: Install AccuBattery and wait for calibration.
• 💻 For technical data: Connect to ADB Or use the engineering menu.
• 🔧 For older models: Disassemble the phone or contact the service.

If you are planning to replace your battery, pay attention to:

• 🔋 The nominal capacity must match the original capacity (for example, 5000 mAh for Redmi Note 11 Pro).
• 🏷️ Labeling – Xiaomi’s original batteries have a hologram and serial number.
• ⚠️ Certification – Avoid cheap counterparts without a certificate CE ROHS.

FAQ: Frequent questions about Xiaomi battery