How to turn on turbocharging on Xiaomi Redmi Note 9 Pro: all the ways and nuances

Xiaomi Redmi Note 9 Pro supports fast charging up to 33 watts, but many users are faced with the fact that the smartphone charges slower than expected. The reasons can be due to the wrong settings and malfunctioning accessories. In this article, we will discuss how to check and turn on turbocharging, what parameters affect speed, and what to do if the function does not work.

It's important to understand that the term "turbocharging" is the marketing name for Quick Charge technology (or MI Fast Charge in the Xiaomi ecosystem). The Redmi Note 9 Pro has a Quick Charge 4+ version, but it requires not only a compatible power supply, but also the right software to work, and if your phone charges for longer than 1.5-2 hours from 0 to 100%, then something is going wrong.

We tested all the activation methods and put together a checklist of activities, from basic to advanced, and you'll also learn what myths about turbocharging are common among users, and why some "tips" from the Internet can harm the battery.

1. Check of cable and charger: basic requirements

The first thing to do is make sure you're using original accessories or certified counterparts.The Redmi Note 9 Pro comes with a 33W power supply (the MDY-11-ED model), but many users lose it or use charges from other devices.

• 🔌 Power supply: should support Quick Charge 4+ or MI Fast Charge (power from the power of the 18 The original SD case shows Output: 5V/3A, 9V/3A, 11V/3A.
• 📱 Cable: only USB Type-C → Type-C with support for high currents (the kit comes with a black cable labeled Xiaomi) 5A). Cables from older models or cheap analogues can limit power.
• 🔋 Port port USB: Check the connector on your phone – contamination or damage to the contacts leads to a drop in charging speed.

If you use a non-original charger, the system can automatically limit power to 10-15 watts, even if the unit supports 33 watts. MIUI, battery-preventive.

How to check the actual charging power? Install the AccuBattery app (available on Google Play) and see the current consumption chart. When turbocharging properly, values should reach 3,000-3500 mA in the first 30 to 40 minutes.

⚠️ Warning: Using damaged cables with bare wires can short-circuit and cause the smartphone power controller to fail. If the cable is rubbed at the base, replace it immediately.

MIUI settings: where turbocharging is enabled

Unlike some Xiaomi flagships, the Redmi Note 9 Pro does not have a separate “Turbo Charge” switch in the menu. Instead, the system automatically detects accessory compatibility and activates accelerated mode.

1. Open Settings → Battery and Performance → Battery settings →
2. Put it on the icon. ⚙️ (gear) in upper right corner.
3. Select Charging Optimization and turn it off. This function limits the current to extend the battery life.
4. Return to the main Settings menu → Additional → Special features → Developer Options.
5. Activate Debugging over USB and find the option "Unplug the charging restriction (if any)" on some firmware, this option is hidden.

If there is no charge clause in the Developer Options, your version of MIUI does not support manual configuration, and you can rely on automatic compatibility determination.

One important nuance: after upgrading MIUI to version 12.5 and higher, some users noticed that the turbocharging was unstable, due to a change in the power management algorithm, the solution is to reset the battery settings:

Settings → Applications → Application Management → Three dots (menu) → Reset application settings → Select “Battery”

3. Software limitations: why charging may not work

Even if you use original accessories, turbocharging may not be activated due to software limitations.

Critical information: On the Redmi Note 9 Pro with MIUI 13+ firmware, turbocharging can automatically turn off when using your phone while charging (games, video, navigation), due to a new thermal control algorithm. To get around the restriction, switch your smartphone to Airplane Mode while charging.

Another hidden factor is the state of the battery, where if the battery capacity has dropped below 80 percent of the original capacity (checked in AccuBattery or through the engineering menu), the system can force current restriction, in which case only a battery replacement will help.

4. Alternative methods of accelerating charging

If standard methods do not help, you can try non-obvious techniques that sometimes work:

• 🔄 Reboot the phone before charging. Sometimes background processes block full power.
• ❄️ Cool your smartphone. Put it on a metal surface or use a cooling stand.
• 📴 Disabling all background applications through Settings → Annexes → Clear it all up.
• 🔌 Use of another USB-port (for example, on the back of the PC instead of the hub).

One of the most effective but risky ways is to unlock the bootloader and run the custom core with optimized power management, but this will void the warranty and may lead to a device blink, and we recommend that only experienced users do so.

For those who don't want to take risks, there's a safer option, which is to reset the settings to factory settings, which will remove all software restrictions, but also erase all data.

Settings → About Phone → Backup → Create a Backup


Settings → Additional → Recovery and Reset → Resetting settings

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If you reset the turbocharging, but it stopped again after a while, the problem is in one of the installed applications. Try to find the culprit by removing the programs one by one.

5. Frequent User Errors and How to Avoid Them

Many owners of Redmi Note 9 Pros, without knowing it, block turbocharging with their actions.-5 mistake:

1. Using a case while charging. Even a thin silicone case can raise the temperature by 5-10°C, which will result in a current restriction.
2. Charging from USB-The maximum power of the port. USB 2.0 - 2.5 W, USB 3.0 - 4.5 W. It's not enough for turbocharging.
3. Ignoring MIUI updates: Newer firmware versions often fix power management bugs.
4. Using wireless charging.The Redmi Note 9 Pro does not support Qi charging, and adapters reduce speeds to 5W.
5. Charging at low temperature (below +10°C) Lithium-ion batteries in the cold lose the ability to quickly take charge.

Another common myth is that if you turn off your phone, it will charge faster. In practice, the difference is only 5 to 10 percent, because the main power consumption when turned off is the work of the power controller. It is much more efficient to switch your smartphone to airplane mode.

⚠️ Note: Do not use fast charging from other brands (such as Samsung Adaptive Fast Charging or OnePlus Dash Charge), even if they support 30.+ Charging protocols differ and this can cause the controller to overheat or accelerate battery wear.

6. Diagnosis of malfunctions: when to contact the service

If none of these things worked, maybe the problem is the hardware, and here are some signs you should go to the service center.

• 🔋 The phone is charged only when it is off.
• 🔥 The body is strongly heated in the area of the camera or connector USB-C.
• ⚡ Charging is jerky: the current then falls to 0, then jumps to 2000 mA.
• 🛠️ On the screen appears a warning "Charger is not supported" even with the original RAM.

The most frequent hardware malfunctions:

Before visiting the service, check whether the warranty period has expired (standard - 12 months). If the phone is warranty, do not disassemble it yourself - this will void the manufacturer's obligations.

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If the turbocharging stops working after falling or getting moisture, the power controller is most likely damaged, in which case repair is mandatory - further use of the faulty device is dangerous!

FAQ: Answers to popular questions