How to turn off turbocharging on Xiaomi Redmi Note 9 Pro: 3 proven ways

Xiaomi Redmi Note 9 Pro features 33W fast charging technology that allows you to restore battery power in minutes. However, this advantage has the downside: accelerated battery degradation, overheating of the device and reducing the overall battery life. If you notice that the smartphone has become faster to discharge or heat up during charging, turning off turbocharging may be the solution.

In this article, we’ll look at three official ways to disable fast charging on the Redmi Note 9 Pro (including the Note 9 Pro Max and Note 9S models), and how it will affect the battery. You’ll learn what settings are hidden in MIUI, how to use third-party apps, and what to do if standard methods don’t work. Importantly, on some firmware, the option may be blocked — we’ll show you how to circumvent this restriction without root rights.

Why is it worth turning off turbocharging on the Redmi Note 9 Pro?

The Quick Charge 4+ technology used in the Redmi Note 9 Pro does speed up the charging process, but has hidden disadvantages:

• 🔥 Battery overheating – with fast charging, the battery temperature can exceed 40°C, which accelerates the wear of lithium-polymer elements.
• ⚡ Reduced charging cycles – according to research, the battery loses up to 20% of capacity after 500 cycles when using turbocharging (versus 800 cycles at standard charging).
• 📉 Uneven wear – fast charging up to 80% and slow to 100% creates voltage at the last percent, which is harmful to durability.
• ⚠️ Risk of battery bloating – with frequent overheating, the likelihood of physical deformation of the battery increases.

Smartphone manufacturers rarely advertise this data, but independent tests (such as from Battery University) confirm that the optimal temperature for charging is 10–30 ° C, and the voltage should not exceed 4.2V per cell.

⚠️ Warning: If you use a non-original power supply or cable, the risk of overheating increases by 2-3 times. Even with the turbocharging turned off, such a charger can damage the battery.

Method 1: Disconnect via hidden MIUI settings (no root)

The easiest method is to use the built-in MIUI options that Xiaomi hides from users. Instructions are suitable for the Redmi Note 9 Pro on MIUI 12-14 firmware:

1. Open the Settings app and go to the About Phone section.
2. Click the MIUI version 7 times in a row until the notification “You are a developer!” appears.
3. Go back to the main settings menu and select a new section for developers.
4. Scroll down and find the option of Charging Current Limitation (or Quick Charge on English firmware).
5. Set the switch to the off position or select Standard Charging (5W).

If you don’t have an option, try an alternative route:

Settings → Battery and performance → Battery settings → Charging mode → Select “Standard”

⚠️ Note: On some versions MIUI For the Redmi Note 9 Pro, for example, MIUI 12.5.3) the option may be blocked, in which case method 2 or method 3 will help.

Enable the developer mode|Check the version. MIUI|Connect the original cable|Charge the battery to 30% (for the test)-->

Method 2: Using the AccuBattery application (with analytics)

AccuBattery not only disables fast charging, but also provides detailed battery health statistics, the best option for those who want to monitor the process and understand how charging affects the battery.

Download AccuBattery from Google Play and follow the instructions:

1. Open the app and provide all the permissions you have requested (including access to battery statistics).
2. Go to the Charging tab and find the Current Limitation section.
3. Set the maximum charging current at 500–1000 mA (this simulates standard charging).
4. Activate the High Current Warning option to receive notifications when the limit is exceeded.

AccuBattery also shows:

• 📊 Real battery capacity (compared to factory).
• 🔋 Number of charging cycles (critical indicator - more than 300 cycles indicates an imminent replacement of the battery).
• ⚡ Temperature during charging (optimally up to 35)°C).

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If the smartphone charges too slowly after turning off turbocharging, try using a 10W power supply (like an old iPhone) that will provide a balance between speed and safety.

Method 3: Disconnect via ADB (for advanced users)

If the first two methods didn’t work, you can use Android Debug Bridge (ADB), a low-level smartphone management tool that requires a computer but doesn’t need root rights.

Step-by-step:

1. Download and install ADB Tools on PC.
2. Enable USB debugging on your smartphone (Settings → Developers).
3. Connect the Redmi Note 9 Pro to your computer and confirm the debugging permission.
4. Open the command line (Windows) or terminal (macOS/Linux) and type:

adb shell settings put global fast_charge 0

To return the turbocharger, use the command:

adb shell settings put global fast_charge 1

If the team doesn’t work, try an alternative:

adb shell settings put global charging_speed 0

⚠️ Attention: Some firmware MIUI block the changes through ADB. In this case, flashing on custom firmware (for example, Pixel Experience) can help, but this requires unlocking the bootloader and can deprive you of warranty.

How to check that the turbocharger is actually turned off?

Turning off fast charging is only half the battle, you have to make sure that the changes are in place. Here are 3 ways to check:

• 📱 Through settings MIUI: Go to Settings. → Battery. → If you put a charge type in the box, it's standard, it works.
• ⚡ With Amperé: Install the Amperé app from Google Play. It will show real current when charging. It should be between 300 and 1000 mA for standard charging.
• ⏱️ Charging time: Full charging from 0% to 100% should take 3-4 hours (vs. 1-1.5 hours with turbocharging).

If after disconnecting the smartphone still charges quickly, check:

• Whether you use the original cable and power supply (non-original may ignore the restrictions).
• Is charging optimization included in the battery settings (sometimes it conflicts with limitations)
• Have you reset your settings after rebooting (some firmware resets restrictions).

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If after turning off the turbocharger, the smartphone began to charge too slowly (less than 200 mA), check the cable and power supply - they may be damaged.

What happens if you use turbocharging all the time?

Smartphone makers, including Xiaomi, often keep silent about the real impact of fast charging on the battery, and research shows that with regular use of Quick Charge 4+:

• 📉 Battery capacity decreases by 15-20% after 300-400 cycles (versus 500-600 for standard charging).
• 🔥 Battery temperature exceeds 40°C in 60% of cases, which accelerates chemical wear.
• ⚠️ Risk of bloating increases 2 times due to uneven distribution of lithium.
• ⏳ Battery life is reduced from 3-4 years to 1.5-2 years.

It is especially critical to use turbocharging in the following cases:

• 🌡️ At ambient temperature above 30°C (e.g. in summer or in a car).
• 🔌 When charging on the go (for example, during games or navigation).
• 📴 At a charge level above 80% (the last percentage is most harmful to the battery).

A University of Michigan study (2021) found that smartphones that charge 100% using fast charging lose 30% of their capacity after 12 months, while charging up to 80% without turbojet degrades only 10%.

Alternative ways to extend the life of the battery Redmi Note 9 Pro

Turning off turbocharging is just one step to saving the battery, and here are 5 more proven recommendations for the Redmi Note 9 Pro:

• 🔋 Charge up to 80%: Use the Optimized Charging function in the MIUI, limiting the charge to 80% (this increases battery life by 30%).
• 🌡️ Avoid extreme temperatures: Do not leave your smartphone in the sun or near heat sources. Optimal range is 10–30°C.
• 📵 Don't discharge to 0%: Connect the charger at 20 to 30%. Deep discharges destroy battery structure.
• 🔌 Use original accessories: Unoriginal cables and power supplies can deliver unstable voltage, which accelerates wear and tear.
• 📲 Update the firmware: In new versions MIUI often improve battery management algorithms (e.g., in the MIUI 14 added adaptive charging).

If you notice that the battery began to run out quickly or swell, do not delay the replacement. The average cost of replacing the battery on the Redmi Note 9 Pro is 1500-2500 rubles (depending on the service center).

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To check for battery bloating, place your smartphone on a flat surface and press the screen slightly. If you have "waves" or warping, the battery is deformed and needs to be replaced.

FAQ: Frequent questions about disabling turbocharging