Xiaomi 9T (also known as Redmi K20 in some regions) is equipped with Quick Charge 4+ fast charging technology that allows you to restore 50% of the battery capacity in just 30 minutes. However, this feature has the flip side: accelerated charging increases the battery temperature, which over time can reduce its life. If you notice that the smartphone is very warm during charging or want to extend the battery life, turning off fast charging is a smart solution.
In this article, we will discuss all available ways to disable fast charging on Xiaomi. 9T, including hidden settings MIUI, utilization ADB-You'll also learn how to check if the function is actually deactivated, and what alternatives exist for gentle charging. MIUI 12-14 and work on all modifications 9T (including 9T Pro).
Why is it worth turning off fast charging on Xiaomi 9T?
Qualcomm’s Quick Charge technology is really handy, but it has a few hidden downsides:
- 🔥 Battery overheating: with fast charging, the battery temperature can rise to 40-45°C, which accelerates the degradation of lithium-ion elements.
- ⚡ Reduced charging cycles: Research shows that using fast charging reduces battery life by 15-20% after 300 cycles.
- 📉 Unstable voltage: Cheap chargers can deliver uneven current, which is harmful to the smartphone power controller.
- 🛠️ Risk of battery bloating: with frequent overheating, the likelihood of mechanical damage to the battery increases.
It is especially important to turn off fast charging if:
- 🔋 You’ve been using a smartphone for over 2 years – the battery is already worn out and fast charging makes the problem worse.
- ☀️ Charge your phone in the heat or in direct sunlight.
- 🔌 Use unoriginal charging or low quality cables.
⚠️ Note: If you have noticed that Xiaomi 9T If you swell in the battery area, or the screen starts to move away from the housing, immediately stop using fast charging and contact the service center!
Method 1: Disconnect via hidden MIUI settings (without ROOT)
The easiest method is to use the MIUI engineering menu, which is available without superuser rights, which works on all versions of MIUI from 12 to 14, but may vary depending on the regional firmware.
Instructions:
- Open the phone app and enter the combination: ##4636##
- In the menu that appears, select Battery Information.
- Scroll down and find the Fast Charge option (or Fast Charge on Russian-language firmware).
- Uncheck the box or switch the switch to off position.
- Reboot your smartphone so that the changes take effect.
☑️ Preparation for fast charging shutdown
If there is no Fast Charge, try an alternative path:
- Go to Settings → Battery and performance.
- Slap the icon. ⚙️ (Additional settings) in the upper right corner.
- Select Charging Optimization and deactivate the Quick Charging option.
⚠️ Note: On some Xiaomi firmware after disabling fast charging through the engineering menu, the option may be activated again after the update MIUI. Check the settings after each update!
What to do if the engineering menu is not opened?
Method 2: Use of the ADB-Teams (for experienced users)
If standard methods don’t work, you can turn off fast charging via Android Debug Bridge (ADB), which requires connecting your smartphone to your computer, but doesn’t need ROOT rights.
What you need:
- 🖥️ A computer with installed Xiaomi drivers and ADB Tools.
- 🔌 Original. USB-cable (preferably from the set).
- ⚙️ Included debugging by USB smartphone.
Step-by-step:
- Activate Developer Mode: Go to Settings → About Phone. Tap 7 times on MIUI until the notification "You've become a developer" appears.
Settings → Additional → For Developers
- USB debugging
- Unlocking OEM (optional but recommended)
- Connect Xiaomi 9T to your computer and confirm the debugging permission on your smartphone screen.
- Open the Command Prompt (Windows) or Terminal (macOS/Linux) in the folder with ADB.
- Enter the command to check the connection: Adb devices must appear serial number of your device.
- Execute the command to disable fast charging: adb shell settings put global fast_charge 0
- Reboot your smartphone: adb reboot
adb shell settings put global charge_limit_enable 1
This option limits the maximum charging current to safe values.-->
| ADB Team Team | Description | The effect |
|---|---|---|
| fast_charge 0 | Turns off fast charging completely | Charging is on the standard 5W-10W |
| charge_limit_enable 1 | Includes current restriction | Maximum current is reduced to 15W |
| fast_charge 1 | Turns on fast charging back | Restores factory settings |
| dumpsys battery | Shows the current status of the battery | You can check if the changes are applied. |
💡
ADB-commands are reset after resetting settings or updating MIUI. To make the changes last forever, you will need to create an autorun script or get a copy of the code. ROOT-rights.
Method 3: Physical limitation of the power of the charger
If software methods have not helped or you do not want to interfere with the settings of the smartphone, you can limit the charging power at the level of the charger. This method is suitable for those who use the Xiaomi 9T with non-original or universal charges.
Limitation options:
- 🔌 Use the charger on 5W–10W: Standard “slow” chargers (e.g. from older smartphones) do not support Quick Charge and automatically charge the phone at reduced power.
- 🔋 Apply USB-hub or extension: some hubs limit current to 0.5A–1A, slowing down.
- 📱 Charge from USB-Computer/laptop port: ports USB 2.0 is not more than that. 0.5A, USB 3.0 to 0.9A.
- 🔄 Use smart timer outlets: you can adjust cycling (e.g. 15 minutes of charging / 15 minutes of pause) to reduce heating.
Advantages of this method:
- ✅ Does not require changing the settings of the smartphone.
- ✅ It works on any firmware, including custom.
- ✅ You can quickly return fast charging by simply changing the charger.
Disadvantages:
- ❌ Charging takes 2-3 times more time.
- ❌ Not all chargers are stable at reduced power.
How to check the actual charging power?
How to check that fast charging is actually turned off?
It's not enough to follow instructions, you have to make sure that the changes are applied.
- Charging time: With fast charging, the Xiaomi 9T recovers 50% in 30 minutes. After switching off, this time will increase to 1.5-2 hours for a full cycle.
- Body temperature: When fast charging, the back panel of the smartphone is heated to 40-45 ° C. With standard charging, the temperature should not exceed 30-35 ° C.
- Monitoring applications: AccuBattery will show the current charging current. If it is below 1500 mA, fast charging is turned off. The CPU Monitor displays the heating of the processor. When fast charging is usually above 50°C.
Sound alert
- Some MIUI firmwares will give a characteristic sound (e.g., "Charging Accelerated") when you connect to a fast charge.
💡
If you use wireless charging, check its power separately! Even if fast wired charging is disabled, Qi charging can run at high currents (up to 20W at some stations). Disable it in settings or use the station on 5W.
What do you do if nothing helps?
If neither of these methods worked, it might be the firmware or the hardware constraints that are the problem.
- 🔄 Update. MIUI Up to the latest version: Newer versions of Xiaomi firmware often add additional charging management options. Check for updates in Settings → The phone. → Updating the system.
- 📱 Install custom software: Firmware like LineageOS or Pixel Experience allows you to flexibly configure charging options. However, this will require unlocking the bootloader and getting a new one. ROOT-rights.
- 🔧 Contact the service center: If the battery Xiaomi 9T already worn out (capacity below 80% of nominal value), fast charging can be blocked at the controller level, in which case only a replacement of the battery will help.
- 🛡️ Use "careful" charging modes: Some applications (such as Battery Charge Limit) allow you to limit the charge to 80%, which prolongs the life of the battery.
⚠️ Note: If you decide to flash your smartphone custom software, remember that this resets all data and can lead to a loss of warranty.Be sure to back up via Mi Cloud or before the procedure. TWRP!