How to turn off fast charging on Xiaomi Mi 9T: 3 proven ways

Xiaomi Mi 9T

battery-wearing

fast-charging

In this article, we’ll break down the three official ways to turn off fast charging on the Mi 9T (including hidden settings), explain when it’s really necessary, and warn against common errors, and learn how to check that the feature is indeed deactivated, and what alternatives exist to keep the battery safe.

If you notice that your smartphone is running out faster, warming up while charging, or your battery is swelling, that's a direct indication to limit current. But before you start setting up, make sure that the problem isn't with a non-original charger or a damaged cable. Using uncertified accessories can nullify any effort to save the battery.

Why does fast charging hurt the Xiaomi Mi 9T battery?

Quick Charge 3.0 technology, which supports the Mi 9T, allows you to charge the battery up to 50% in 30-40 minutes. However, this mode of operation has the opposite side: high current and voltage accelerate the degradation of lithium-ion cells. According to research, with constant use of fast charging, the battery capacity can decrease by 15-20% after 1.5-2 years of active use.

Main risks:

• 🔥 Battery overheating – with fast charging, the battery temperature can rise to 40-45°C, which is critical for its durability.
• ⚡ Accelerated cycle wear – each full charging cycle at high current “eats” more of the resource than in the standard mode.
• 📉 Unstable voltage – cheap chargers can deliver uneven current, resulting in micro-damage to elements.

It is important to understand that the harm is not caused by the technology itself, but by its misuse, for example, if you constantly charge your smartphone up to 100% at maximum speed or leave it on charge all night, the risks are significantly increased, while the periodic use of fast charging (for example, in emergency cases) will not cause significant damage.

Xiaomi doesn’t recommend turning this feature off for no good reason, as it’s optimized for the original accessories.But if you’re using non-branded charges or notice signs of battery wear, limiting current can be a reasonable trade-off.

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To minimize the damage from fast charging, try not to charge your smartphone to 100%, the optimal range is from 20% to 80%, and this will extend the battery life by 30-40%.

Method 1: Disconnect via standard settings (the easiest)

If your Xiaomi Mi 9T is running on MIUI 12 and later, the manufacturer has added the ability to limit charging current directly to the settings menu.This method does not require superuser rights and is safe for the device.

Step instructions:

1. Open the Settings app (cog icon).
2. Go to the Battery and Performance section.
3. Select the Battery Settings item.
4. Slip on Charging Mode (or Charging Optimization in some firmware versions).
5. Activate the Normal Charging switch (or Limit current).

After that, the smartphone will charge at a standard speed (usually up to 10W instead of 18W).The full charge time will increase by about 1.5-2 times, but this is compensated by a careful attitude to the battery.

Use the original Xiaomi charger

Check the battery temperature (should be <35°C)

Close all active applications before charging

Make sure that the MIUI version is not lower than 12.0.3

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Note: Some firmware may not have Charging Mode, in which case try to upgrade to the latest version or use alternative methods described below.

Method 2: Use of an engineering menu (for power users)

If your version of MIUI does not have a charging restriction option in the standard settings, you can use the engineering menu, which requires caution, as incorrect changes can lead to malfunctions of the device.

Step-by-step:

1. Open the phone app and enter the combination: ##4636##
2. In the menu that appears, select Battery Information.
3. Scroll down and find Fast Charge Config (or Quick Charge Config).
4. Slip it and select Disabled.
5. Save the changes and restart the device.

Once you reboot, the fast charge will be turned off. To get it back, repeat the steps and select Enabled.

⚠️ Note: Not all versions MIUI Support changing this setting through the engineering menu, so if nothing happens after you enter the code or the menu doesn't open, don't try again, because it can block access to the settings.

Alternative path to the engineering menu (if the standard code doesn't work):

• Download the MTK Engineering Mode app from Google Play (for MediaTek-based devices only).
• Open it and go to the Hardware Testing → Charging section.
• Find the Fast Charging option and deactivate it.

Method 3: Disconnecting through ADB (Universal Method)

If previous methods didn’t work, you can use Android Debug Bridge (ADB), a low-level smartphone management tool that works for all versions of MIUI and doesn’t require root rights, but requires a connection to a computer.

What you need:

• 🖥️ Computer with installed Xiaomi drivers and package ADB Tools.
• 📱 USB-cable (preferably original).
• 🔧 Included debugging by USB smartphone.

Instructions:

1. Activate Developer Mode on Mi 9T: Go to Settings → About Phone. Tap 7 times on MIUI Version. Go back to the main settings menu and open Additional → For Developers. Enable USB Debugging.

Connect your smartphone to your computer and confirm the debugging permission.

ADB

adb devices

(Serial number of the device must be displayed).

adb shell settings put global fast_charge 0

Reset the device.

To return a quick charge, use the same command, replacing 0 by 1.

⚠️ Attention: Misuse of the right ADB Do not enter commands whose purpose you do not know. If after completing the command, the smartphone stopped charging at all, reset the settings via adb shell settings delete global. fast_charge.

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ADB-commands allow you to disable fast charging even on locked firmware, where the manufacturer hid this option. MIUI The settings may be reset and the procedure will have to be repeated.

How to check that fast charging is actually turned off?

Turning off the function is only half the battle, making sure the smartphone is actually charging in standard mode. Here are 3 ways to check:

1. Through the AccuBattery app (recommended):

2. Through the engineering menu:

By charging time:

If the fast charge time did not increase after the fast charge was turned off and the temperature remained high, then the settings did not apply. Try repeating the procedure or checking the compatibility of your firmware.

Frequent Mistakes and How to Avoid Them

Many users have trouble turning off fast charging, and here are the most common errors and solutions:

1.Settings reset after MIUI update

• 🔄 Problem: After installing the new firmware version, fast charging is activated again.
• 🛠️ Solution: Repeat the disconnection through ADB You can also use applications like MacroDroid to automatically execute commands after an update.

2.The smartphone is not charging at all

• ⚡ Problem: After changes to the engineering menu or ADB charging has stopped completely.
• 🔧 Solution: Reset the battery settings via the command: adb shell dumpsys battery reset or return the standard settings via adb shell settings delete global fast_charge.

3.Fast charging is off, but the smartphone still warms up

• 🔥 Problem: Battery temperature remains high even after the function is turned off.
• ❄️ Solution: Check: Are you using the original charger, are there any active background processes (games, navigation), or is the battery damaged (check with AccuBattery - if the battery is below 70% healthy, it is time to replace it).

If none of these methods worked, the problem may be a hardware malfunction of the power controller, in which case it is recommended to contact the service center.

Alternatives to shutting down fast charging

If you don’t want to give up the convenience of fast charging entirely, but are worried about the health of the battery, there are a few compromise solutions:

1.Use "smart" chargers

• 📱 Examples: Xiaomi Mi Charge Turbo (30W) Automatic current limitation when 80% charge is reached.
• 🔋 Advantage: Charges quickly to 80%, then goes into sparing mode.

2. Set up charge limitation through apps

• 📊 Apps: AccuBattery, Battery Charge Limit (requires root).
• ⚡ Function: Automatically shutting down charging when a predetermined percentage is reached (e.g., 80%).

3. Charge your smartphone in a cool place

• ❄️ Temperatures are lower 25°C reduces battery wear by 15-20%.
• 🚫 Avoid charging in direct sunlight or near heat sources.

4.Use wireless charging (5W)

• 🔄 Slower but more careful for the battery.
• 📱 Suitable for Mi. 9T Qi-enabled (requires an adapter).

These methods allow you to maintain the convenience of fast charging, minimizing its negative impact on the battery.

FAQ: Answers to Frequent Questions