The fast charging feature in Xiaomi Mi 8 smartphones can significantly reduce battery recharge time, but this advantage is not always justified. Users often face situations when it is necessary to temporarily or permanently deactivate this mode: to extend battery life, when using non-original chargers or in the event of overheating of the device. In this article, we will discuss all available methods for turning off fast charging on the Mi 8, including hidden settings and potential risks.
It is important to understand that the Xiaomi Mi 8 supports Quick Charge 3.0 technology, which automatically activates when a compatible charger is connected.Switching off this mode can affect the charging speed, but in some cases this is a justified measure.For example, if you notice that the phone is very hot during charging or the battery has become more quickly discharged, temporarily turning off the accelerated mode will help diagnose the problem.
Before making any changes, make sure your charger and cable are working properly. Often, damaged accessories are the cause of overheating or slow charging, not smartphone settings. Also check the firmware version: in older MIUI builds, some options may be missing or not working properly.
Method 1: Disconnect via standard MIUI settings
The easiest and safest method is to use the built-in operating system options. Most MIUI versions for the Xiaomi Mi 8 include the ability to limit charging power directly from the settings menu.
1. Open the Settings app on your smartphone.
2. Go to Battery and Performance (in some versions of MIUI this item may be called Battery).
3.Slip the icon. ⚡ in the upper right corner of the screen (or find Battery Settings).
4.In the menu that opens, find the Quick Charge (or Quick Charge) option and move the slider to the Off position.
If your firmware version doesn't have this option, try updating MIUI to the latest version available. In some regional builds, the option may be hidden, in which case the following method will help.
☑️ Preparation for fast charging shutdown
Method 2: Use of an engineering menu (for power users)
If standard settings do not allow you to deactivate Quick Charge, you can use the hidden engineering menu, which requires caution, since incorrect changes can lead to malfunctions of the device.
1. Open the Phone app and enter the combination:
##4636##2. In the menu that opens, select Battery Information (or Battery Information).
3. Find the Fast charging line and tap it. In some versions, you may need to select Disable fast charging from the optional menu.
⚠️ Warning: Changes to the engineering menu don't persist after the device is restarted. If you need to permanently turn off fast charging, this method will have to be repeated every time or use specialized applications.
Also note that some firmware may have different paths, such as the global versions of MIUI, where the engineering menu may be called Testing, and the fast charging option may be hidden under Hardware info.
What to do if the engineering menu is not opened?
Method 3: Applications for Charging Control
If the built-in methods don't work, you can use third-party utilities. One of the most popular solutions is AccuBattery, which not only displays detailed battery statistics, but also allows you to limit the charging current.
1. Install AccuBattery from Google Play.
2. Open the application and go to the Charging tab.
3. Activate the Charging Limit option and set the maximum current at 1000 mA (this will turn off fast charging).
4. Connect the charger - the application will automatically limit the power.
The advantage of this method is that the restriction will be in effect continuously, regardless of reboots, but keep in mind that the application must run in the background, which can slightly increase battery consumption.
⚠️ Note: Some antiviruses may block AccuBattery, considering the limitation of charging suspicious activity.
| Method of disconnection | Difficulty | Persistence | Risks. |
|---|---|---|---|
| Standard settings of MIUI | Low. | Constantly. | Absent. |
| Engineering menu | Medium | Before the reboot. | Failure of settings with incorrect actions |
| AccuBattery | Low. | Constantly. | Increased background battery consumption |
| ADB-team | Tall. | Constantly. | Loss of warranty when unlocking the loader |
Additional settings to extend battery life
Turning off fast charging is just one way to keep your battery capacity. If your goal is to maximize the battery life of the Xiaomi Mi 8, check out the following recommendations:
- 🔋 Avoid full discharge and charging to 100%.The optimal range is from 20% to 80%.
- 🌡️ Do not use your phone in extreme temperatures (below 0)°C or higher than 35°C).
- 🔌 Turn off charging immediately after reaching the desired level – a long stay reduces battery life by 100.
- 📵 Turn on Battery Savings mode in settings MIUI low-charge.
Critical moment: Xiaomi Mi 8 with firmware older MIUI 12, turning off fast charging through standard settings may not work due to manufacturer limitations, in which case the only reliable way is to use the device. ADB-commands or third-party applications.
If you notice that the battery has become discharged too quickly even after the Quick Charge is turned off, check its condition in the Settings → Battery → Battery Condition. In case of serious wear (more than 500 cycles or capacity below 70%), it is recommended to replace the battery.
💡
To check the number of charging cycles on the Xiaomi Mi 8, type in the engineering menu code ##4636##, then select Battery Information → Battery usage history. This displays accurate statistics, including the number of full cycles and current capacity per mAh.
Frequent Mistakes and How to Avoid Them
When trying to turn off fast charging, users often encounter typical problems, and here are the most common ones and ways to solve them:
- ❌ Option is not available in the settings → Update. MIUI Use the latest version or use the engineering menu.
- ❌ After restarting, fast charging is activated again. → This is normal behavior for the engineering menu. Use AccuBattery for permanent restriction.
- ❌ The phone does not charge at all after the Quick Charge is turned off. → Check the cable and the charger, which may not be compatible with normal charging.
- ❌ AccuBattery application does not limit current → Give him permission to change the system settings in Settings → Annexes → Special access.
Another common mistake is to try to disable fast charging via configuration files in /system/build.prop. Without root rights, such changes will not persist, and incorrect editing of system files can lead to bootloop ( looped boot).
If none of these methods worked, it could be custom firmware with remote charging controls, in which case only flashing the device to the official MIUI version would help.
ADB-Teams for experienced users
For those who are ready to work with Android Debug Bridge, there is a way to disable fast charging at the system level, which requires an unlocked bootloader and enabled debugging over USB.
1. Install. ADB-computer-assist.
2. Connect Xiaomi Mi 8 to USB and allow debugging in the developer settings.
3. Enter in the command line:
adb shell
su
echo 0 > /sys/class/power_supply/battery/fast_charge4. Reset the device.
⚠️ Note: This method may not work on new versions MIUI Because of security constraints, and also misuse. ADB-commands may cause data loss or system failure. it is recommended to create a backup before experiments.
To return fast charging, replace 0 with 1 in the last command. Note that after updating the firmware settings may reset.
💡
Use of the ADB-Commands are the most reliable way to disable Quick Charge at the system level, but it requires technical skills and can void the warranty.
When is fast charging really necessary?
Despite the convenience, there are situations when deactivation of Quick Charge becomes not desirable, but a mandatory measure:
- 🔥 The phone warms up during charging (more than 45).°C, which may damage the battery.
- 🔋 Battery capacity has dropped below 70% of its original capacity, and you want to slow down further degradation.
- ⚡ You are using an uncertified charger that does not support the Quick Charge 3.0 standard.
- 🚗 Charging occurs in the car through a lighter - unstable voltage can damage the power controller.
At the same time, there are cases when it is not recommended to turn off fast charging:
- ⏳ It is critical to recharge quickly (for example, before an emergency trip).
- 🔄 You use the original Xiaomi charger and don’t watch overheating.
- 📱 New device (less than 1 year old) and battery shows no signs of wear.
If you’re in doubt about whether to turn off Quick Charge, do an experiment: charge your phone as normal for a week and compare battery temperature and discharge rate to fast charging mode. Use apps like CPU Monitor or AIDA64 to monitor temperature for objectivity.