How to know exactly the percentage of battery power on Xiaomi: hidden features and engineering codes

Controlling battery power is a key aspect of Xiaomi’s smartphone operation, especially if you’re actively using the device during the day. Even with a standard indicator in the status bar, many users face situations where accurate information about battery percentage, voltage or even wear is required, such as calibrating the battery after a replacement or diagnosing a quick discharge.

In this article, we will examine not only the obvious verification methods (via notification panel or widget), but also hidden functions. MIUI, engineering codes, as well as third-party utilities that provide advanced data on the state of the battery (MIUI 12-15) and models – from budget Redmi to flagship Xiaomi 14 Ultra.

If you notice that your smartphone suddenly shuts down at 15-20% charge or, conversely, holds the last percentage for too long, this is a direct signal to the diagnosis. Perhaps the problem lies in the incorrect calibration of the power controller or battery wear.

1. Standard method: indicator in the status bar

The simplest and most obvious method is to look at the battery icon in the upper right corner of the screen, and MIUI displays either a graphical indicator (battery icon) or an exact percentage of charge, by default, to switch between these modes:

1. Open Settings → Screen.

2. Go to the Status Line section.

3. Activate the switch Show the percentage of battery charge.

• 🔄 For MIUI 14/15: The option may be in the settings → Screen. → Additionally.
• ⚡ In some models (for example, POCO F5) Percentage is displayed by default inside the battery icon.
• 📱 For devices with AMOLED-screens (for example, Xiaomi 13 Pro) available mode Color indicator, where the icon changes color depending on the level of charge.

If the percentage suddenly disappeared after updating the firmware, try resetting the screen settings: → Annexes → Application management → Settings (⚙️) → Warehouse → Clear the data. Attention: this will reset all personal screen settings, including brightness and theme.

2. Battery widget on the desktop

To quickly access charge information, you can add a battery widget to the home screen, which is especially useful if you use a window case or often check the charge in energy saving mode.

Instructions for adding a widget:

1. Press and hold the empty space on the desktop.
2. Select Widgets from the bottom menu.
3. Scroll through the list to the Tools or System section.
4. Drag the Battery widget (or System Status) onto the screen.

• 🔋 The widget can show not only the percentage, but also the battery temperature, operating time and even the history of discharge.
• 📊 On some firmware (for example, MIUI EU) Extended widget with consumption schedule is available.
• ❌ If the widget is not displayed, check if the system widgets are disabled in Settings. → Desktop → Desktop settings.

Tip: For models with wireless charging support (e.g. Xiaomi 13T Pro), the widget can show the current charge power in watts (e.g., 18W or 30W).

💡

If the battery widget is not updated in real time, restart your smartphone or clear the cache of the MIUI System UI application (Settings → Applications → Show All → System Applications).

3. Engineering menu: hidden data about the battery

For advanced users who need detailed battery information (voltage, current, wear and tear), an engineering menu is suitable, it is available through secret codes or the Engineering Mode app (pre-installed on some models).

Method 1: USSD-code

##4636##

After you enter, you will open the Testing menu, where you will select Battery Information.

• 📊 Charge level (in percent and millivolts).
• 🔌 Voltage (normal: 3.7–4.4V Li-Pol batteries).
• 🌡️ Temperature (critical if above 45)°C).
• 🔄 Condition (e.g. Charging or Discharging).

Method 2: via CIT (for models with MIUI 13+)

1. Open the phone app and type ##248##.
2. Select Battery Info.
3. Scroll to the Battery Health section – the percentage of wear and tear (if supported by the controller) can be displayed here.

⚠️ Note: Not all Xiaomi models support displaying battery wear through the engineering menu.On budget devices (e.g. Redmi) 10A) This option may not be available.

4. Third-party applications for battery monitoring

If standard MIUI tools aren't enough, third-party utilities will come to the rescue, not only showing the exact percentage of charge, but also plotting discharge graphs, estimating wear and even predicting the remaining operating time.

Top.-3 apps:

Important: Apps like AccuBattery require calibration – use them for at least 2-3 days to collect accurate data. Also note that some features (such as wear assessment) may not be available on custom firmware devices.

On models with a Snapdragon 8 Gen 2 processor (such as Xiaomi 13), applications can show low battery voltage due to MIUI optimizations.

Charge your smartphone to 100% and let it stand for 10-15 minutes

Turn off battery optimization for diagnostic app (Settings → Apps → Permissions → Battery Optimization)

Launch the application and wait for full data synchronization (can take up to 5 minutes)

Compare readings with data from the engineering menu for accuracy-->

5. Verification through ADB: for experienced users

If you want the most accurate battery data, including factory capacity and current wear, you can use the ADB (Android Debug Bridge) command, which is suitable for users familiar with USB debugging.

Step-by-step:

1. Turn on Developer Mode: Go to Settings → About Phone and click on MIUI Version 7 times.
2. Activate USB Debugging in Settings → Additional → For developers.
3. Connect your smartphone to your PC and execute the command: adb shell dumpsys battery
4. In the conclusion, find the lines: level: 85 - current percentage of charge. voltage: 4123 - voltage in millivolts. temperature: 305 - temperature in tenths of a degree Celsius (305 = 30.5 ° C).

To check the actual capacity of the battery (taking into account wear) use the command:

adb shell dumpsys batterystats

⚠️ Attention: Teams ADB may not work on devices with a locked bootloader or custom firmware. ADB on working smartphones without need – this can lead to system failures.

6.Diagnostics of battery wear: when it's time to change the battery

Even if the smartphone is 100% charge, it does not guarantee that the battery is running at full capacity. Over time, lithium polymer batteries degrade, losing up to 20-30% of capacity in 2-3 years of active use.

• 🔋 Smartphone shuts down at 15-30% charge (symptom of "sudden shutdown").
• ⚡ Battery life has decreased by more than 40% compared to the new device.
• 🔥 The battery heats up even when lightly loaded (for example, when watching a video).
• 📉 Monitoring applications show a capacity of less than 80% of the factory capacity (for example, 3200 mAh instead of 4000 mAh).

To check wear without disassembling the device:

1. Use the AccuBattery app (Health section).
2. Compare the current capacity with the passport (indicated on the battery sticker or in the model specifications).
3. If the difference is more than 20%, consider replacing the battery at the service center.

Example: For Xiaomi Redmi Note 11 Pro+ factory battery capacity is 4500 mAh If the application shows 3500 mAh, wear is ~22%, which is already critical for stable operation.

💡

If your smartphone is warranty-free, don’t try to replace your battery yourself, as this will void warranty obligations.

7. Frequent errors and myths about battery check

When diagnosing a battery, users often encounter incorrect information, and let's take a look at some of the most common misconceptions:

• 🚫 Myth 1: “If you charge your smartphone to 100%, the battery will deteriorate quickly.” Reality: Modern Xiaomi controllers automatically limit the charge to the level of the battery. ~95-98% for protection against overcharging. A full cycle of 0-100% is only harmful if repeated.
• 🔄 Myth 2: "You have to completely drain the battery once a month to calibrate." Reality: Lithium polymer batteries don't have a memory effect. Deep discharge (below 3%) only accelerates degradation.
• ⚡ Myth 3: "Fast charging ruins the battery." Reality: Xiaomi uses multi-stage charging algorithms (e.g. Surge) P1 Xiaomi 12S The heating is controlled and after 80% the current is automatically reduced.

Another common mistake is using uncertified chargers, such as a 5W power supply for a 120W charger smartphone (Xiaomi 13 Pro) will not only slow charging, but can also cause a faulty percentage of charge due to unstable current.

FAQ: Answers to popular questions