How to check the status of the Xiaomi battery: from the code *#*#4636#*#*** to the multimeter test

The battery is the heart of Xiaomi’s smartphone, which not only affects battery life, but also the stability of the device. Over time, the battery capacity decreases: after 300-500 charging cycles, it can lose up to 20-30% of its original volume. But how do you know that the battery of your Redmi Note 12, POCO X5 or Mi 11 is already worn out and needs to be replaced? In this article, we will examine all available methods, from hidden engineering menus to hardware diagnostics.

We're not going to just focus on basic tips like "look at the time of work," but instead, you'll learn how to accurately measure the actual battery capacity, recognize software and hardware malfunctions, and when to worry about security, all of which are adapted to MIUI 14 and later, but will also work for older versions of firmware.

1. Check through the engineering menu (#4636##)

The fastest way to get data about the battery is to use a hidden engineering menu, which is available on all Xiaomi smartphones without root rights and additional applications.

1. Open the Phone app.
2. Enter the combination: ##4636### (some models may require ##4636*#*#).
3. In the menu that appears, select Battery Information.

Here you are interested in three key parameters:

• 🔋 Level of charge (level) – current percentage in digital form (may differ from the indicator in the status bar).
• 📊 Health is a generalized measure of wear (e.g., Good, Replace soon).
• ⚡ Voltage – should be in the range of 3.7-4.4 V for lithium polymer batteries.

⚠️ Warning: If the voltage is below 3.5 V at 100% charge or above 4.5 V, this is a sign of critical wear or malfunction of the charging controller!

The limitation of the method: the engineering menu does not show the actual capacity per mAh, only relative data. For accurate measurements, read the next section.

2. Accurate capacity measurement via AccuBattery or AIDA64

You'll need third-party apps for detailed diagnostics, and we recommend two proven tools:

1. AccuBattery (free, with premium options) – specializes in monitoring the battery, shows real wear and discharge rate.
2. AIDA64 (paid version) – provides advanced information, including battery temperature and history of charging cycles.

How to use AccuBattery:

• 📱 Install the app from Google Play.
• 🔄 Charge your phone to 100% and wait for calibration (may take 1-2 cycles).
• 📊 Go to the Health tab – here you will see the current capacity in mAh and the percentage of wear and tear.

Example of data decryption:

AIDA64 provides even more data, including Battery Technology (e.g. Li-Polymer) and Production Date (if supported by the controller) to find this information:

1. Open AIDA64 and go to the Battery section.
2. Scroll to the Battery Properties block.
3. Pay attention to the parameters of the design capacity and condition.

3. Visual signs of battery wear

You don't always need software to suspect battery problems, but you need to look at these physical symptoms.

• 🔥 Bloating of the body – if the back cover or screen began to “go away”, and the phone does not lie well on a flat surface, this is a sign of gas formation inside the battery.
• ⚡ Spontaneous reboots at 20-40% of charge - indicates unstable voltage.
• 🔋 Fast discharge in the cold – worn-out batteries lose capacity at low temperatures (below 10)°C).
• 📉 Charge jumps (e.g. 50% to 20% per second) – controller failure or cell damage.

If you notice bloating, immediately disconnect the phone from charging and do not use it - the risk of fire or battery explosion increases dramatically, in which case you need to replace the battery in the service center.

⚠️ Warning: Don't try to open a bloated battery yourself! lithium polymer batteries contain caustic chemicals and can ignite if damaged.

4. Check through ADB (for advanced users)

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.

Instructions:

1. Install ADB Tools on your PC.
2. Turn on USB Debugging on your phone: Settings → About Phone → MIUI version (click 7 times to activate Developer Mode), then Settings → Additional → Developers → Debugging over USB.
3. Connect your phone to your PC and type in the command line: adb shell dumpsys battery

In conclusion, pay attention to the lines:

• Level is the current charge in percentage.
• Voltage is the voltage in microvolts (divided by 1000 for volts).
• Temperature: Temperature in tenths of °C (e.g. 285 = 28.5 °C).
• Capacity - real capacity in μA·h (divided by 1000 for mA·h).

Example of output for Xiaomi Redmi Note 10 Pro:

level: 85




voltage: 4123 (4.123 V)




temperature: 293 (29.3°C)




capacity: 4500000 (4500 mAh)

If the capacity is less than 80% of the declared capacity (for example, 4000 mAh instead of 5000 mAh), the battery is severely worn out.

adb shell dumpsys battery > battery_log.txt

This will help you track changes over time.-->

5. Multimeter test (for experienced users)

If you have a multimeter, you can measure the battery voltage directly, which is suitable for devices with removable batteries (for example, the old Redmi 4X or Mi A1) or after disassembling the phone.

Step-by-step:

1. Turn off the phone and remove the battery (if possible).
2. Transfer the multimeter to DC mode with a limit of 20 V.
3. Connect the black probe to the minus contact (−), the red one to the plus one (+).
4. Take your statement.

Transcription of results:

⚠️ Warning: Do not measure the voltage on a working phone - this can damage the charging controller.Always disconnect the battery from the board before the test.

Analysis of operating times and charging cycles

Even without tools, you can measure the battery's status by real-time performance.

1. Charge the phone to 100%.
2. Turn off charging and use the device in standard mode (Wi-Fi, 50% brightness, no games).
3. Keep the time to full discharge (0%).

Compare the results with the standards for your model:

If battery life has been reduced by more than 30%, this is an excuse to check the battery with one of the methods above.

Also note the number of charging cycles. One cycle = discharge from 100% to 0%. Xiaomi's average battery life:

• 📱 300-500 cycles – capacity decreases to 80%.
• 🔋 500-800 cycles – capacity drops to 60-70%.
• ⚡ >1000 cycles – the battery must be replaced.

💡

If the phone runs out in 2-3 hours without active use, the problem is not only the battery, but possible causes: background processes, viruses or a motherboard malfunction.

7. When it's time to change the battery: checklist

So, to sum up, battery replacement is necessary if:

The cost of replacing the battery in Xiaomi service centers:

• 💰 Redmi/POCO (battery 4000–5000 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh) — 1500–2500 ₽.
• 💰 Mi/Xiaomi flagships (batteries) 4500–5500 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh) — 2500–4000 ₽.
• 🔧 Self-substitution (if experienced) – 800-1500 ₽ battery-wise + tool.

Where to change it:

• 🏢 Authorized service centers – 6-12 months warranty, original spare parts.
• 🔧 Unofficial workshops are cheaper, but the risk of poor-quality batteries.
• 🛠️ Independently - only if there is experience in disassembling smartphones and a soldering iron to disconnect the plumes.

After replacing the battery, be sure to calibrate the charging controller:

1. Charge the phone to 100%.
2. Turn off the charging and use until full discharge (0%).
3. Repeat the cycle 2-3 times.

FAQ: Frequent questions about Xiaomi batteries