Calibration of Xiaomi Redmi battery 4X: Correct the wrong charge level in 5 steps

Why Redmi? 4X shows the wrong battery charge?

Xiaomi Redmi Smartphone 4X (codename santoni) with lithium-ion battery capacity 4100 mAch over time begins to show strange behavior: the percentage of charge jumps from the 30% before 10% In a second, the device is turned off when 20-30% residue 100% post 10 The reason is not physical wear and tear (although it also affects) but a failure of the power controller, a chip that tracks the actual level of charge.

Battery calibration is a software controller data reset that helps synchronize the actual battery voltage with the percentage displayed. 4X The problem is exacerbated by the fact that the smartphone is often operated on non-original firmware (for example, MIUI 9-12 from third-party developers, where power management algorithms may not work properly, and after battery replacement, calibration is required in the system. 100% In some cases, the new power supply has different discharge characteristics that the controller must "learn".

It is important to distinguish between software failure (solved by calibration) and physical wear (requires battery replacement). If after full discharge the smartphone does not turn on even from charging or the case is swollen, calibration is useless. 2-3 No special skills required.

Signs that the Redmi battery 4X calibration is needed

Not every percentage spike is a reason to calibrate, but here are the exact symptoms that indicate a controller failure:

• 🔋 The smartphone is turned off when 15-30% charge, but after charging shows 0% and immediately switch on.
• ⚡ Charging to 100% less 1 hour (with the original power supply) 5V/2A).
• 📉 The percentage of charge "sinks" from 50% to 1% in a few minutes, then just as sharply recovers.
• 🔄 After rebooting, the battery level changes to ±10-15%.
• 🚫 B Settings → Battery → The state is displayed as "Unknown" instead of working time.

If one of the points matches, the power controller has lost sync with the battery. 4X It often happens after:

• 🔧 Firmware updates (especially with MIUI 8 on MIUI 10+).
• 🔄 Resetting to factory settings.
• 🔋 Battery replacements (even with the original battery).
• ⚡ Use of non-original chargers with higher voltage 5V.

⚠️ Warning: If the smartphone overheats during charging (above 45)°C) or the battery is swelling - calibration prohibited. These are signs of critical wear and tear, requiring immediate battery replacement.

Calibration Preparation: What to Do in Advance

Calibration on Redmi 4X It's three steps: full discharge, non-interrupted charging, and controller data reset:

Use the original cable and power supply (5V/2A)

Turn off all background activity (see instructions below)

Charge your smartphone to 100% before discharging

Prepare a timer or alarm clock for 3-4 hour

Backup of important data (in case of reset)

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1. Turn off background processes:

1. Go to Settings → Battery → Battery Use.
2. Click on the three dots in the top right corner and select Optimization.
3. Turn off auto-start for all applications except system ones.
4. Turn on the Battery Saving mode.

Check the status of the battery:

• Install the AccuBattery app (available on Google Play).
• Charge your phone to 100% and check the battery health setting. If it's below 70%, calibration may not help.
• Pay attention to the discharge schedule: sharp dips indicate a failure of the controller.

Prepare the charger:

Use only the original cable and power supply from Xiaomi with output 5V/2A. Unoriginal charging with tension 9V or 12V (For example, from the Redmi Note 8 Pros may damage Redmi's power controller 4X, It does not support fast charging technology.

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If there is no original unit, use the charger from Redmi. 3S or Redmi 4A — They have identical characteristics (5V/2A) and compatible with Redmi 4X.

Method 1: Calibration through full discharge-charging cycle

It's the safest way, and it doesn't require root rights or special software. 4X any version MIUI (custom-made).

Step 1 - Complete discharge

1. Charge your smartphone to 100% (use the original adapter).
2. Turn off charging and use your phone as normal until it turns off on its own (don’t manually turn it off!).
3. Wait after you turn it off. 5-6 hours – it is necessary that the voltage at the terminals of the battery fell to the minimum level.

Step 2 Continuous charging

1. Connect your smartphone to charging and do not turn off, even if it turns on.
2. Wait until the lock screen is displayed. 100% (usually 2-3 hour).
3. Leave the phone to charge for another 1 hour after reaching 100%.

Step 3: Battery data reset

1. Turn off the charging and turn on the smartphone.
2. Go to Settings. → All settings → Battery → Battery status.
3. Click on the three dots in the upper right corner and select Reset Battery Statistics (on some firmware, the item is called Calibration).
4. Confirm the action and restart the phone.

After the reboot, the power controller will recalculate the battery settings. 1-2 weekly.

⚠️ Note: If after calibration the smartphone is still turned off when 20-30% Check the status of the battery contacts. 4X often oxidized spring contacts on the motherboard - they need to be cleaned with alcohol.

Method 2: Calibration through the engineering menu (for advanced)

This is a good way to do it if standard calibration doesn't work. It requires access to an engineering menu (Engineer Mode) that's hidden in the firmware. 4X menu is available without root rights, but careless actions can lead to system failure.

Step 1 Enter the Engineering Menu

1. Open the Phone app.
2. Enter the combination: ##4636###.
3. Select Battery Information (Battery Information).

Step 2: Resetting the controller data

In the Battery information menu, look for the Battery health option. If it displays Unknown or a value below Good, follow the following steps:

1. Click on Battery Health and hold for 5 seconds - a reset window should appear.
2. Select Reset Battery Stats (some firmware may call it Calibrate).
3. Confirm the action and wait for the reboot.

Step 3: Recalibration

After resetting through the engineering menu, be sure to complete the full discharge-charging cycle (see Method 1).

⚠️ Note: If the Battery voltage setting shows the value below 3.4V upon 0% Charge it with the original adapter when it's off. 1-2 An hour before continuing the calibration.

Method 3: Calibration with ADB (for power users)

If the first two methods don’t work, you can reset your battery data via Android Debug Bridge (ADB). This method requires a computer and basic knowledge of working with the command line.

Step 1. Set it up. ADB-driver

1. Download Platform Tools from the official Android website.
2. Unpack the archive into the root of the disk C:\ (path should not contain Cyrillic).
3. Turn it on on Redmi. 4X Developer mode: go to Settings → About the phone and 7 times click on the version MIUI.
4. Return to Settings → Additional → For developers and activate Debugging over USB.

Step 2. Connect your phone to your PC

1. Get Redmi on the line. 4X computer-wise USB-cable.
2. In the platform-tools folder, hold the Shift. + right-button → Open the PowerShell window here.
3. Enter the command to check the connection: adb devices If the device is displayed – you can continue.

Step 3: Battery data reset

Perform the following commands in order:

adb shell


su




rm /data/system/batterystats.bin




reboot

If after rebooting the percentage of charge still jumps, perform a full discharge-charging cycle (see Method 1).

⚠️ Note: Su command requires root rights. If none are available, use an alternative command without root: adb shell dumpsys battery reset The effect will be less noticeable, but will help with minor failures.

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ADB-Calibration is the most radical method, but it resets all the data of the controller, including the history of the energy consumption of applications. 2-3 Charging cycles may be displayed incorrectly - this is normal.

What if calibration doesn’t help?

If after all the manipulations of Redmi 4X And it's still showing inappropriate battery behavior, and it's deeper than that:

• 🔋 Physical wear of the battery: Capacity below 60% of nominal value (checked in AccuBattery) Solution - battery replacement (original artwork. MBJ416640).
• 🔌 Failure of the power controller: the microchip BQ24192 (It's a motherboard that fails with frequent voltage drops.
• 📱 Firmware failure: On custom MIUI (For example, xiaomi.eu, power management algorithms may not work properly, so the solution is to flash the official global version through the Mi Flash Tool.
• 🔧 Contact oxidation: The battery's spring contacts or charging connector are contaminated. The solution is alcohol and benton cleaning.

To diagnose battery wear, use the command ADB:

adb shell dumpsys battery

Pay attention to the parameters:

• health: should be 2 (Good).
• voltage 100% charge — 4.2V–4.3V.
• temperature: normal 250–350 (tenth-degree).

If the health is 3 (Overheat), 4 (Dead) or 7 (Over Voltage) the battery is replaced.

How to extend the life of Redmi battery 4X post-calibration

Calibration solves the charge display problem, but doesn't stop the physical wear of the battery.To Redmi 4X You have served longer, follow the rules:

• 🔋 Avoid full discharge: Optimal range 20%-80%, full discharge (0%) and charge (100%) accelerate degradation.
• ⚡ Use the original charging: Power units with output 9V/12V (For example, from the Redmi Note 5) reduce the battery life of the 30%.
• 🌡️ Control the temperature: Do not use your phone on a charge in temperatures above 30°C (e.g. under direct sunlight).
• 📵 Disable background processes: Apps like Facebook or Telegram in the background consume up to 15% of the charge per hour.
• 🔄 Update the firmware: In new versions MIUI Optimized power management algorithms (e.g., in the MIUI 12.5 Added Ultra Battery Saver Mode).

Battery savings settings on Redmi 4X:

1. Go to Settings → Battery → Battery Mode.
2. Choose Balanced or Saving Charge.
3. Activate AutoRun Optimization for all applications.
4. Include charge saving in the background for social networks and instant messengers.

To check the actual capacity of the battery, use the test:

1. Charge the phone to 100%.
2. Disable all communications (Wi-Fi, mobile data, Bluetooth).
3. Turn on the plane mode and start the video in offline mode (brightness 50%).
4. Set time to full discharge.Redmi's normal 4X — 8-10 hours.

If the battery life is less than 5 hours, the battery capacity has dropped below 60%, and calibration will not help.

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Regular calibration (once in a year) 3 Months) and compliance with charging rules extend the life of Redmi's battery 4X on 20-30%. But if the smartphone is older, 3 Prepare to replace the battery - lithium-ion cells lose up to 20% capacity.

Frequent questions about Redmi battery calibration 4X