Calibration of the battery on Xiaomi: why you need and how to do it correctly

Xiaomi smartphones (including the Redmi and POCO lines) are known for their energy efficiency, but even the best batteries eventually get incorrect. One way to get the battery back to accurate charge readings is calibration, a process that helps synchronize the power controller data with the actual battery status, eliminating problems like suddenly turning off at 20-30% charge or jumping percentage on the screen.

Many users confuse calibration with battery training or cycle counter resetting, but these are different procedures. Calibration does not restore battery capacity or "rejuvenate" it - it only corrects the system readings. In this article, we will discuss when calibration is really required, how to conduct it on Xiaomi devices with MIUI or HyperOS, and what errors can lead to a deterioration of the situation.

When you need to calibrate the battery on Xiaomi

Don't calibrate the battery "just in case" - this can lead to excessive wear and tear.

• 🔋 The smartphone suddenly turns off when the charge readings 20-40%, before, I had worked before. 5-10%.
• 📉 The percentage of charge "jumps" (for example, from 50% immediately to 30% after rebooting).
• ⚡ After full charge, the phone shows 100%, but through 10-15 minutes of use, the level drops to 80-85%.
• 🔄 B Settings → Battery → Battery state is displayed incorrect capacity (for example, 3,500 mAh instead of 5000 mAh).

These symptoms often appear after a firmware update, reset or prolonged use without full discharge/charging cycles. Calibration will not help if the battery is physically worn out (capacity below 70% of nominal) - in which case replacement is required.

⚠️ Attention: If the phone turns off at 0% and only turns on after connecting to a charge, this is normal behavior. Calibration is necessary when the disconnection occurs at a significantly higher percentage of charge.

Calibration Preparation: What to Do in Advance

Incorrect preparation can nullify all efforts or even make things worse.

Make sure the battery temperature is within 15-35°C (check in Settings → Battery)

Turn off all background processes (especially games and social networks)

Use an original or certified cable and power adapter

Charge your phone to 100% and let it charge for another 1-2 hours

Prepare time: the full cycle will take 6-12 hours-->

Important: for calibration are not suitable wireless charging, power bank or USB-ports of the computer. Use only a network adapter with an output current of at least 2A. If you have a model with support for fast charging (Redmi Note 12 Pro+, Xiaomi 13 Ultra, etc.), you can use the original RAM, but turn off the fast charging function in the settings.

Check the battery status through the engineering menu:

##4636##

In Battery information, look at the health parameter, and if it shows unknown or below good, calibration may not help.

Methods of calibration of the battery on Xiaomi

There are three main calibration methods, varying in complexity and efficiency, depending on the model and the degree of the problem:

1. Software calibration via MIUI/HyperOS

The safest method, suitable for most devices (Redmi 10/11/12, POCO X3/X4/X5, Xiaomi 12/13/14, etc.) does not require root rights or special knowledge.

1. Charge your phone to 100% and leave it on charge for another 2 hours.
2. Turn off charging and use the phone as normal until it runs out before automatically turning off.
3. Don't turn on your phone right away! Wait at least 5 hours (preferably 8-12).
4. Connect to charging and charge to 100% without interruptions.
5. Turn on your phone and check the battery readings.

This method works 70-80% of the time with minor controller failures, so if the problem persists, move on to the next one.

2. Calibration through the engineering menu (for advanced)

Suitable for Qualcomm Snapdragon-based devices (POCO F3/F4/F5, Redmi K40/K50, etc.) requires caution, as incorrect actions can lead to resetting.

1. Enter the code for the engineering menu: ##36446337###
2. Go to Battery (or MBAT on some firmware).
3. Select Battery Calibration and confirm the action.
4. Wait until the process is complete (the phone can restart).
5. Perform a full discharge/charging cycle as in the first method.

⚠️ Note: On devices with MediaTek processors (Redmi) 9/10/Note 10) The engineering menu may be missing or have a different interface. Don't use third-party calibration apps, they often contain malicious code.

Calibration through ADB (for power users)

This method requires a computer and command line knowledge, and is suitable for all models, but if used incorrectly, it can lead to data loss.

1. Install ADB Tools on your PC.
2. Enable USB Debugging in Settings → About Phone → MIUI version (click 7 times on the line with the version).
3. Connect your phone to your PC and type the commands: adb shell su dumpsys battery set ac 1 dumpsys battery reset
4. Turn off your phone and complete the full discharge/charging cycle.

Frequent calibration errors and how to avoid them

Many users complain that calibration has not helped or even made things worse, and 90% of the time it is due to typical errors:

Another common mistake is ignoring battery status before calibration, where battery capacity has dropped below 70% (checked through Settings → Battery → Battery status or an application like AccuBattery), calibration won’t help.

💡

After calibrating for 2-3 days, avoid using fast charging and wireless charging functions, which will help the battery controller to "fix" new data.

How to check the calibration result

Evaluation of the effectiveness of the procedure takes 3-5 days.

• 📊 Smooth change in percentage charge without jumps (check through Settings) → Battery → Schedule of use).
• ⏱ Battery life should be consistent with the stated (e.g. Redmi Note) 12 Pro+ s 5000 MACH should hold 8-10 medium-load).
• 🔌 No sudden shutdowns when 10-20% charge.
• 🌡 Battery temperature is normal (up to 40)°C on charging, up to 45°C with intensive use).

For an objective assessment, use the AccuBattery app (available on Google Play):

1. Install the application and provide all necessary permissions.
2. Charge your phone to 100% and use it until it is completely discharged.
3. Check the discharge schedule in the Health section – it should be smooth, without sharp falls.
4. Compare the real capacity with the passport (admissible deviation - up to 10%).

If after calibration problems remain, the power controller or the battery itself may have malfunctioned, in which case contact the Xiaomi service center.

💡

Calibration doesn't increase the actual capacity of the battery -- it only corrects the system readings. If the battery is worn out, the only solution is to replace it.

Alternative methods to improve battery performance

If the calibration did not give the expected result or you want to extend the life of the battery, use these tips:

• 🔄 Partial Charging Cycles: Try to keep the charge between 20% and 80% – this reduces battery wear.
• 🌡 Temperature control: Avoid overheating (do not play heavy games while charging) and hypothermia (do not leave your phone in the cold).
• 🔌 Optimization of charging: In Settings → Battery enable Optimized Charging (limits charge to 80% at night).
• 📵 Background activity management: Limit auto-run of unnecessary apps through Settings → Annexes → Autostart control.
• 🔄 Update: Install updates regularly MIUI/HyperOS — They often contain corrections to manage nutrition.

For HyperOS devices (e.g. Xiaomi 14, Redmi K70), Adaptive Charging is available, which analyzes your charging habits and optimizes charging processes.

1. Go to Settings → Battery → Battery settings.
2. Select Adaptive Charging and follow the instructions on the screen.
3. Activate the Smart Optimization option for automatic background activity management.

⚠️ Note: On devices with MediaTek (Redmi) 10C, POCO M4 Pro) manually disabling the processor cores through the engineering menu can lead to unstable operation.

FAQ: Answers to Frequent Questions