Disabling fast charging on Xiaomi Redmi Note 8 Pro with MIUI 12: the full guide

Xiaomi Redmi Note 8 Pro

fast-charging

MIUI 12

If you notice your phone getting hot while charging or your battery is getting worse, you might want to temporarily or permanently turn off fast charging. In this article, we'll look at all the options available, from standard settings to hidden engineering menu commands, and how this will affect battery life and what alternatives you can use.

Before you start settings, make sure your Redmi Note 8 Pro runs on MIUI 12 (or later). Check this in Settings → About Phone → MIUI Version. If you have another firmware, some techniques may not work.

Why do you need to turn off fast charging on the Redmi Note 8 Pro?

Quick Charge 3.0, which is supported by the Redmi Note 8 Pro, allows you to charge the battery up to 50% in 30-40 minutes.

  • 🔥 Overheating of the device - with fast charging, the battery temperature can rise to 40-45°C. which adversely affects its resources.
  • 📉 Accelerated battery degradation – Lithium-ion batteries lose capacity faster with frequent fast-charging cycles.
  • ⚡ Risk of damage to the power controller – unoriginal chargers or cables can cause voltage surges.
  • 🛌 Uncomfortable use while charging – the phone may lag or limit performance due to thermal trottling.

Studies show that with constant use of fast charging, the battery capacity can decrease by a small amount of time. 15-20% through 1,5-2 If you plan to use your smartphone longer, you'd better switch to standard power charging. 5W-10W.

📊 How often do you use fast charging?
Constantly.
Only when you're in a hurry.
I used to, but now I've turned it off.
Never used it.

Method 1: Disconnect via standard MIUI 12 settings

Some versions of MIUI 12 for the Redmi Note 8 Pro have a built-in option to disable fast charging, but this may not be available depending on the regional firmware.

  1. Open the Settings.
  2. Go to the Battery and Performance section.
  3. Select Battery Settings.
  4. Find the Quick Charge (or Quick Charge) option.
  5. Switch the slider to the off position.

If this is not the case, don't worry, because your firmware version doesn't support this option, and then you'll have to use alternative methods.

Check the MIUI version in the settings

Make sure your phone is at least 30% charged.

Use the original USB-C cable

Close all background applications-->

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

If there is no standard method, you can use the Engineering Mode, which requires caution, as incorrect actions can disrupt the device.

Instructions for disabling fast charging through the engineering menu:

  1. Open the Phone app.
  2. Enter the combination: ##4636###.
  3. In the menu that opens, select Battery Information.
  4. Find the Fast Charge or Quick Charge.
  5. Click on it and select Disable.
  6. Reset the device.

Important: After the restart, the engineering menu settings may reset, so that the changes remain, repeat the procedure or use the method with ADB (described below).

What to do if the engineering menu is not opened?
If the ##4636## combination doesn’t work, try the following options: 1 "MTK Engineering Mode" from Play Market (MediaTek processors only). 2. ADB-3. Check if the access is blocked by antivirus or system restrictions MIUI.

Method 3: Disconnecting via ADB (the most reliable method)

If previous methods have failed, the most reliable option is to use Android Debug Bridge (ADB), which requires connecting the phone to a computer, but is guaranteed to turn off fast charging at the system level.

Step-by-step:

  1. Download and install ADB Tools on your computer.
  2. Turn on USB Debugging on your phone: Go to Settings → About Phone. Tap 7 times on MIUI to activate Developer Mode. Return to Settings → Additional → Developer. Activate USB Debugging.

Connect your phone to your PC through USB-cable.

Open the command prompt (Windows) or terminal (macOS/Linux) in the folder with ADB.

adb devices

(The name of your device should appear)

adb shell
settings put global fast_charge 0

Reboot the phone.

To return a fast charge, use the same command, but with a 1 instead of a 0.

💡

If ADB does not recognize the device, try reinstalling drivers or using another USB-Xiaomi’s original cables often perform better than cheap ones.

Comparison of methods of shutting down fast charging

Not all methods are equally effective. The table below shows the pros and cons of each method:

MethodDifficultyReliabilityPC requiredReset after update
Standard settings⭐ (simple)Low (not always there)No.No.
Engineering menu⭐⭐ (middle-of-the-road)Medium (may reset)No.Yes.
ADB-team⭐⭐⭐ (difficult)High (constant shutdown)Yes.No.
Third-party annexes⭐⭐ (middle-of-the-road)Low (security risk)No.Maybe.

For most users, ADB is the best option, as it guarantees a stable result, but if you don’t want to connect your phone to your computer, try the standard settings or the engineering menu first.

What to do if the fast charging does not turn off?

Sometimes even after you've done all the instructions, the phone still charges at high power, and this can happen for the following reasons:

  • 🔌 Non-original charger – cheap charging often ignores system limitations and delivers maximum current.
  • 📱 Update MIUI — After the update, the settings can be reset.
  • 🔧 Power controller failure – in rare cases, flashing or repairs are required.
  • 🛠️ Castom firmware - informal assemblies MIUI They can ignore the system commands.

If the problem persists, try the following steps:

  1. Use a charger with a power of no more than 10W (5V/2A).
  2. Check if fast charging is enabled in third-party app settings (e.g. Greenify or AccuBattery).
  3. Reset your settings to factory (pre-reverse!).
  4. Contact the service center if you suspect a hardware malfunction.

💡

If the phone still charges fast, check the voltage on the power supply with a multimeter. Some smart charging automatically increase the power, even if the system prohibits it.

How to check that fast charging is actually turned off?

To make sure that the changes have taken effect, several methods can be used:

  1. Check through Amper: Install the Amperé app from Play Market. Connect the charger. If the charging current is less than 1000-1500 mA, fast charging is disabled.
  2. Monitoring Charging Time: With Standard Charging (5W) battery 0 before 100% post 3-4 It takes an hour to charge fast. 1,5-2 hour.

Temperature monitoring

  • Use the CPU Monitor or AIDA64 app to track battery temperature.
  • If it does not rise above 35°C, fast charging is successfully disabled.

💡

If you use wireless charging, its power can also affect charging speed, and MIUI settings sometimes have a separate switch for fast wireless charging.

Alternative ways to extend the life of the battery

Turning off fast charging isn’t the only way to keep the battery in place, but here are some more recommendations for the Redmi Note 8 Pro:

  • 🔋 Avoid full discharge – recharge your phone when the charge drops to 20-30%.
  • ☀️ Don’t leave your phone in the sun – overheating accelerates the degradation of lithium-ion batteries.
  • 📵 Disable unnecessary functions (NFC, GPS, Bluetooth when not in use.
  • 🌙 Use a dark theme — AMOLED-The screen consumes less energy.
  • 🔄 Update. MIUI — Newer versions of firmware often optimize power consumption.

You can also use battery monitoring applications such as:

  • AccuBattery - shows the real battery capacity and wear rate.
  • Battery Guru – optimizes the background processes.
  • GSam Battery Monitor – Details the charge consumption of applications.