Xiaomi Redmi 9T is equipped with fast charging technology (18 watts), which allows you to restore battery power in minutes. However, this advantage has the flip side: accelerated charging can lead to overheating of the device, shortening battery life and even unstable system operation. If you notice that the phone is very hot during charging or the battery is discharged too quickly, it may be worth temporarily or permanently disabling the Fast Charging function.
In this article, we’ll look at all the ways you can disable fast charging on the Redmi 9T, from standard MIUI settings to hidden engineering menus and third-party utilities. We’ll also learn how to check if the feature is deactivated and what alternatives can help extend battery life without losing convenience. Importantly, some methods require root rights or system files changes — we’ll warn you of the risks in advance.
Why do you need to turn off fast charging on Redmi 9T?
Quick Charge technology (or Fast Charging in Xiaomi terminology) is convenient, but not always useful, and here are the key reasons Redmi 9T users decide to deactivate it:
- 🔥 Overheating of the device - with rapid charging, the body temperature can reach 40-45°C, which adversely affects the processor and battery.
- 📉 Battery degradation – Lithium-ion batteries wear out faster at high charging currents.Switching off the function can extend life by 15-20%.
- ⚡ Unstable power supply – in some regions with poor-quality power grids, fast charging leads to failures or even damage to the power controller.
- 🛌 Night charging – if you leave your phone on charge all night, it’s best to use slow mode to avoid excessive heating.
According to research, the smartphone battery loses up to 30% of capacity in 2 years with regular fast charging, whereas in standard mode this figure drops to 15-20%. If you plan to use the Redmi 9T for longer than 2-3 years, disabling the function will be a smart decision.
⚠️ Attention: If your Redmi is 9T already severely discharged (less than 70% of the original capacity), turning off fast charging may temporarily improve the situation, but will not return the battery to its previous characteristics.
Method 1: Disconnect via standard MIUI settings
The easiest and safest method is to use the built-in MIUI options. Unfortunately, in some versions of the firmware for Redmi 9T, this feature is hidden, but it can be activated through additional settings.
Instructions:
- Open the Settings app.
- Go to the Battery and Performance section.
- Select the Battery Settings item.
- Slip on Charging Mode (if there is no option, see Method 2).
- Activate the Standard Charging switch (or Turn off Fast Charging).
If there is no Charging Mode, try upgrading to the latest version of MIUI (see System Update).In some regional versions, the option may be called otherwise, such as Optimized Charging.
Check out the MIUI version (Settings → About the phone)
Connect the original cable and power supply
Charge your phone to at least 30% for stability
Backup important data (in case of failure)
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Method 2: Use of the Engineering Menu (without root)
If the standard method doesn't work, you can use the Engineering Mode, which doesn't require superuser rights, but changing some parameters can cause the device to run in an unstable way.
Step-by-step:
- Open the Phone app.
- Enter the combination: ##4636###.
- In the menu that opens, select Battery Information.
- Scroll down and find the Fast Charge Config (or similar).
- Change the value from Enabled to Disabled.
- Save the changes and restart the phone.
If Fast Charge Config is missing, try the alternative code: ##6484## (battery testing menu).
⚠️ Warning: Changes to the engineering menu may reset after updating the firmware. It is also not recommended to change other settings if you are not sure about their purpose - this can damage the power controller.
What to do if the engineering menu is not opened?
Method 3: Disconnect via ADB (for advanced users)
If previous methods have failed, you can use Android Debug Bridge (ADB), which requires connecting your phone to your computer and basic command line knowledge.
What you need:
- 💻 A computer with installed Xiaomi drivers and ADB.
- 📱 USB-cable (preferably original).
- ⚙️ Included debugging by USB (Settings → The phone. → Version. MIUI (tap 7 times) → Additionally. → For developers → Debugging by USB).
Instructions:
adb shell
settings put global fast_charge_enabled 0
settings put global wireless_fast_charge_enabled 0After you've done the commands, restart your phone. To get the charge back, replace 0 with 1.
⚠️ Attention: Misuse of the right ADB This may cause data loss or device locking. Do not change other settings unless you understand their purpose.
💡
Before using ADB, back up your data via Mi Cloud or locally, which will take 5-10 minutes but save your files in case of a crash.
Method 4: Third-party applications (with or without root)
If you don't want to mess with manual settings, you can use specialized utilities, and let's look at two options: for devices without root and with root rights.
Without root: AccuBattery
AccuBattery (available on Google Play) doesn't turn off fast charging directly, but it allows you to limit charging current by simulating the standard mode.
- Install and open AccuBattery.
- Go to the Charging section.
- Activate the option to limit the charging current.
- Set the value not above 1000 mA (1A).
From root: Quick Charge Disabler
For root-enabled devices, Quick Charge Disabler (available on XDA Developers) will be a good tool to block the function at the system level:
- Download and install. APK-file.
- Give root access.
- Activate the Disable Fast Charge switch.
- Reboot the phone.
| Method | Root is required. | Difficulty | Risk to the system |
|---|---|---|---|
| Standard settings | ❌ No. | ⭐ Very simple. | ❌ No. |
| Engineering menu | ❌ No. | ⭐⭐ Easy. | ⚠️ Low. |
| ADB | ❌ No. | ⭐⭐⭐ Middle-Average | ⚠️⚠️ Medium. |
| AccuBattery | ❌ No. | ⭐ Very simple. | ❌ No. |
| Quick Charge Disabler | ✅ Yes. | ⭐⭐ Easy. | ⚠️⚠️⚠️ High-pitched |
💡
The safest ways are standard settings and AccuBattery, with ADB or root, which gives you more control, but you need to be careful.
How to check that fast charging is turned off?
After applying one of the methods, it is important to make sure that the changes have taken effect.
- ⚡ Charging time – when Redmi fast charging is turned off 9T It will charge from 0 to 100% in 2.5-3 hours (instead of 1.5 hours).
- 🌡️ The temperature of the case - during charging the phone should not be heated above 35-37°C (check in AccuBattery or code ##4636##).
- 📊 Charging current – use the Ampere app (Google Play). With standard charging, the current should not exceed 1000-1200 mA.
- 🔍 Notification – in some firmwares, when connecting charging, a pop-up with a mode appears (for example, “Slow charging").
If your phone is still warming up or charging too fast after you turn off fast charging, try:
- Reset the device.
- Use a different cable/power supply (sometimes unoriginal accessories ignore the restrictions).
- Reset the settings to factory (Settings → Additional → Recovery and Reset).
Frequent mistakes and their solutions
When you turn off fast charging, Redmi 9T users often face typical problems, and let’s look at the most common ones and how to fix them.
1. The option "Charging Mode" is not in the settings
Probable reasons:
- An outdated version of MIUI (update the firmware).
- Regional restrictions (for example, in firmware for India or China, the option may be hidden).
- The scaling back (try to return the scaling back).
Solution: Use the Engineering Menu or ADB.
2 After the shutdown, the phone charges even slower than usual.
This may be due to:
- Faulty cable/power supply (try the original accessory).
- Background processes that consume energy (check in Settings → Battery).
- Failure of the power controller (diagnosis is required in the service center).
3.Fast charging turns on itself after restarting
A typical problem for methods with an engineering menu or ADB. Solutions:
- Repeat the shutdown procedure.
- Use Quick Charge Disabler (requires root).
- Update the firmware - in new versions of MIUI bugs fixed.
⚠️ Note: If after manipulating the charging settings, the phone stopped turning on or shows a “Battery low” error when connecting to the network, this may indicate damage to the power controller.