How to check the battery status on Xiaomi Redmi Note 5: from codes to diagnostics applications

Xiaomi Redmi Note 5 is one of the most popular smartphones of the brand, but over time, even its reliable battery capacity of 4000 mAh begins to lose performance. If the phone runs out in half a day, suddenly turns off at 20-30% charge or overheats during charging, it’s time to diagnose the battery. In this article, you will find 7 proven ways to assess its condition, from hidden engineering menus to professional applications.

We will not only examine software methods (codes ##4636##, MIUI Diagnostics), but also physical signs of wear and how to interpret capacity, voltage and charging cycles correctly. We will focus on typical Redmi Note 5 problems, such as sudden shutdowns when low charge, often due to incorrect calibration of the power controller.

Important: The methods in this article are suitable for all Redmi Note 5 modifications (including the Redmi Note 5 Pro and Redmi Note 5A), but keep in mind that the results may vary depending on the MIUI version and the wear and tear of the device.

1. Verification through the engineering menu (USSD codes)

The fastest way to get basic information about a battery is to use hidden service codes, which do not require additional applications to be installed and work even without an Internet connection.

Enter the following code in the Phone application:

##4636##

After that, the Test menu will open, where you will select Battery Information.

• 🔋 Charge level (percentage) is a current indicator, but it may be inaccurate when downgraded.
• ⚡ Voltage (in millivolts) – the norm for the Redmi Note 5 at 100% charge: 4.35-4.40 V. If the value is below 3.7 V at 20% charge – the battery is severely worn out.
• 🔄 Temperature - optimal range: 25-40°C. Exceeding 45°C when charging or working signals degradation of elements.
• 📊 Condition - if indicated Good, do not worry. Bad or unknown require additional diagnosis.

⚠️ Attention: On some firmware MIUI The code ##4636## can be blocked:

##6484##

It will open the MTK Engineer Mode menu (if the Redmi Note 5 processor is MediaTek). Go to Hardware Testing → Battery for similar data.

2. Diagnostics through MIUI Diagnostics (built-in application)

Xiaomi has built-in MIUI to test hardware components, including the battery, to use:

1. Open the Settings app.
2. Go to About the Phone. → All specifications.
3. Tap 5 times in a row on the item Kernel (or the version of MIUI on new versions).
4. Enter your password (if requested): 123456 or password.
5. Choose Diagnostics → Battery Test.

The app will check:

• 📉 Real capacity (compared to the factory 4000 mAh) If the difference is more than 20%, it is time to change the battery.
• 🔌 Charging/discharge speed – the norm for the original RAM: 1.5–2.0 A.
• 🛠️ Charging cycles – after 500 cycles, the capacity usually drops to 70-80% of the original.

⚠️ Note: Some custom firmware may not have Diagnostics. In this case, use third-party applications (see section 4).

Charge your phone to 100% | Turn off all apps in the background | Check the body temperature (should not exceed 30°C) | Use the original RAM

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Visual inspection of the battery

If you're ready to disassemble the Redmi Note 5, a visual inspection of the battery will give you the most accurate picture of its state.

1. Turn off the phone and remove the back cover (a plastic shoulder blade or mediator will be required).
2. Carefully disconnect the battery plume from the motherboard.
3. Examine the battery for:

• 🔥 Bloating - if the battery case is deformed (bulges, bubbles), it should be replaced immediately!
• 💧 Electrolyte dashing – white or green plaque on contacts or body.
• 🔌 Contact oxidation – green or black coating on metal parts.
• 📏 Deformation – if the battery does not fit tightly to the body.

⚠️ Warning: If the battery is swelling, don't try to puncture or bend it, it can cause fire.

4. Battery testing applications

If engineering menus are not available or you want a more detailed analysis, use third-party utilities.The best options for the Redmi Note 5 are:

• 📊 AccuBattery shows real capacity, discharging speed and wear. The free version is quite functional.
• 🔋 Battery HD — Monitors temperature, voltage and battery life.
• 🛠️ CPU-Z — Battery displays technical data (technology, voltage, level of health).
• 📈 GSam Battery Monitor – analyzes the charge consumption by application (useful for identifying “gluttonous” services).

How to use AccuBattery:

1. Install the app and allow access to battery statistics.
2. Charge your phone to 100% and wait for the app to collect data (usually 1-2 charge/discharge cycles).
3. In the Health section, see:

• Design capacity – if less than 3200 mAh, the battery is severely worn out.
• Wear - up to 20% normal, 30-50% - requires observation, >50% - replacement.
• Temperature peaks – if the chart shows frequent jumps above 40°C, check the RAM and cable.

⚠️ Attention: Some applications (e.g, CPU-Z) They may show inaccurate capacity on older versions. MIUI. For accuracy, use AccuBattery or MIUI Diagnostics.

1. Reboot the phone.

2. Clear the app cache in Settings → Apps.

3. use other software (e.g. Battery HD).

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Discharge test (method "100 to 0 per cent")

This method will help to estimate the actual operating time and identify problems with the calibration of the controller.

• Charge your phone to 100% (use the original RAM).
• Turn off Wi-Fi, mobile data and GPS.
• Set the screen brightness to 50%.
• Start the timer.

Normal performance for the Redmi Note 5:

If the phone turns off at 15-30% charge, the problem may be:

• 🔋 Controller calibration (solved by resetting via Recovery).
• 🔌 Failed battery (replacement required).
• 🛠️ Damaged motherboard (diagnostics in the service).

Background processes (check in Settings → Battery).

Non-optimized applications (e.g. Facebook, TikTok)

Problems with the communication module (constant network search).

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6. Check through ADB (for advanced users)

If you want the most accurate data, use Android Debug Bridge (ADB), a method that requires a PC and basic command line knowledge.

Instructions:

1. Install ADB Tools on your computer.
2. Turn on the phone to debug by USB (Settings → About Phone → MIUI version → tap 7 times; then Additional → For developers).
3. Connect Redmi Note 5 to your PC and execute the command:

adb shell dumpsys battery

In the answer, pay attention to the parameters:

• Level is the current level of charge (%).
• Voltage (in microvolts; divide by 1000 for volts)
• Temperature: Temperature (in tenths of °C; for example, 285 = 28.5 °C).
• Health is the state (2 = good, 3 = bad).

To check the actual capacity, use the command:

adb shell dumpsys batterystats --charged

It's going to show you how many mAhs were charged in the last cycle, compared to the factory's 4,000 mAh.

Calibration of the battery (if the percentage is incorrect)

If the Redmi Note 5 suddenly turns off at 20 to 30 percent charge or charges up to 100 percent in 10 minutes, the problem could be a knocked-down controller calibration.

Method 1: Through Recovery

1. Turn off the phone.
2. Press Volume Up + Power before the MI logo appears.
3. Select Wipe & Reset → Wipe Battery Stats (use volume buttons for navigation).
4. Reboot your phone and fully discharge/charge it 2-3 times.

Method 2: Manual calibration

1. Reduce the phone to 0% (until it turns off).
2. Connect the original RAM and charge continuously for 8-10 hours (even after 100%).
3. Disconnect from the network and use until completely discharged.
4. Repeat the cycle 2-3 times.

⚠️ Note: Calibration only helps with software failures. If the battery is physically worn out (bloating, low capacity), this method will not return its original characteristics.

FAQ: Frequent questions about the Redmi Note battery 5