How to enable fast charging on Redmi 9: full compatibility check instructions

Xiaomi’s Redmi 9 is one of the most popular budget smartphones, but many users are faced with the question: why does their device charge too slowly?The fact is that fast charging on this model is not always activated by default, and sometimes requires the right settings or even a replacement charger. In this article, we will discuss all the ways to enable fast charging, from checking support for technology to manual activation in the hidden MIUI menus.

Redmi 9 supports Quick Charge 3.0 technology (18W), But only if you meet three conditions: the right charger, the right cable, and the activated option in the firmware. If at least one of these points is not met, the smartphone will charge in standard mode (5W–10W). We have tested all methods on the current versions. MIUI 14 and Android 12, so the manual will work in 2026.

Before you get to the settings, answer one question: are you sure your charger supports fast charging? Many users mistakenly believe that any power supply from Xiaomi will work, but it is not. Next, we will understand how to check compatibility and what to do if the smartphone stubbornly does not want to charge faster.

1. Check support for fast charging on Redmi 9

The first step is to make sure your Redmi 9 supports Quick Charge technology at all.Although all versions of this smartphone (including Redmi 9A, 9C, 9T) are equipped with the appropriate controllers, some regional firmware can artificially limit charging power to 10W. This is done to extend battery life, but the user can disable the restriction.

To check for support, follow the following steps:

• 🔍 Go to Settings. → The phone. → Version. MIUI and tap 7 times on the kernel line to activate the developer mode.
• 📱 Go back to the main settings menu and open a new section for developers.
• ⚡ Scroll down and find the Charging Status (or Battery in some versions) and the current mode will be listed here: Standard (5W–10W) or (18W).

If you only see Standard on this menu, fast charging is turned off at the firmware level. Don't worry, in the next sections we'll tell you how to fix it. Also pay attention to the battery temperature: if the smartphone overheats, the system automatically reduces the charging power to safe values.

2.What charger is needed for fast charging?

Even if all is on in the settings, fast charging won’t work without a compatible power supply. The Redmi 9 comes with a standard 10W (5V/2A) charger that doesn’t support Quick Charge. To activate accelerated charging, you’ll need to:

• ⚡ Charger with Quick Charge Support 3.0/4.0 or Power Delivery (PD) power-up 18W.
• 🔌 Cable USB Type-C with support for high currents (preferably original from Xiaomi or certified) USB-IF).
• 📱 A faulty connector on your smartphone (check for contamination or damage).

Here is a table of compatible chargers from Xiaomi and other brands:

⚠️ Note: Using uncertified chargers can cause the battery to overheat or even catch fire.If you see the smartphone heat up a lot during charging (more than 45)°C), immediately disconnect it from the network and check the power supply for damage.

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If you don’t have the original Xiaomi charger, look for models from Baseus or Ugreen that support Quick Charge 3.0. They are cheaper, but not inferior in quality.

3. How to enable fast charging in MIUI settings

If you already have a compatible charger, but your smartphone still charges slowly, it may be disabled in the firmware. Depending on the version of MIUI, the path to settings may vary. We've compiled the current ways for MIUI 12-14:

Method 1: Using the battery menu (official method)

1. Open Settings → Battery and Performance.
2. Slip on Battery Settings (or additionally in some versions).
3. Find the Quick Charging option (could be called Accelerated Charging) and activate the switch.

Method 2: Through Performance Modes

If the first method is not in your firmware, try:

1. Go to Settings → Special Opportunities → Performance Modes.
2. Choose High Performance (this automatically activates fast charging).

⚠️ Note: Some firmware for Redmi 9 (especially global versions) have hidden the fast charging option, in which case only manual activation through the Redmi 9 will help. ADB Or install custom firmware. Read about it in the next section.

Make sure the charger supports Quick Charge 3.0|

Check the cable for damage |

Update MIUI to the latest version|

Clean Type-C connector from dust and debris-->

4. Manually enable fast charging via ADB (for experienced)

If your firmware doesn't have a fast charging option, you can turn it on through the ADB debugging bridge. This method requires you to connect your smartphone to your computer, but it gives you 100% results.

1. Download and install Platform Tools (includes ADB).
2. Activate debugging by USB in the developer settings (Settings → For developers → Debugging by USB).
3. Connect your smartphone to your PC and type in the command line:

adb shell settings put global fast_charge 1

Once you have completed the command, restart the device. Now, when you connect a compatible charger, the smartphone should be charged at full power.

🔹 How to check if the method has worked?

• 📊 Install AccuBattery from Google Play.
• 🔌 Connect the charger and see the current power in real time.
• ⚡ If the value exceeds 10W, So fast charging is activated.

⚠️ Attention: Misuse of the right ADB-If you are not sure about your actions, it is better to contact a more experienced user or use alternative methods from this article.

5.Why doesn't fast charging work even after switching on?

You did everything according to the instructions, but the Redmi 9 still charges slowly? The reasons can vary from software constraints to hardware problems.

• 🔋 Battery wear: If the battery drains too quickly or is bloated, the charging controller automatically reduces power.Check the battery condition at AccuBattery (Health section).
• 🌡️ Overheating: Battery temperature above 45°C fast charging turns off. Let the smartphone cool down before connecting to the network.
• 🔌 Damaged Type-C connector: If the contacts are contaminated or bent, the smartphone may not recognize the charger. Clean the connector with alcohol and a soft brush.
• 📱 Outdated Firmware: In Older Versions MIUI (below 12.5), fast charging may not work properly.Update via Settings → Updating the system.

If none of these are suitable, try resetting the battery settings:

1. Go to Settings → Applications → Application Management.
2. Click on the three dots in the top right corner and select Reset app settings.
3. Confirm the action and restart the smartphone.

🔹 Last chance: If nothing helps, there may be a problem with the motherboard's power controller, in which case only repairs at the service center will help.

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Fast charging on Redmi 9 only works if three conditions are met: a compatible charger, an activated option in the firmware and a serviceable battery. If any of them are not met, the smartphone will charge in standard mode.

6. Alternative methods of accelerating charging

If you can't turn on Quick Charge, you can try to optimize the charging process with other methods, which won't give you the same speed as 18W, but it's possible to reduce charging time by 20 to 30 percent.

• ✈️ Air mode: Disables all radio modules (Wi-Fi, mobile network, Bluetooth), reducing the load on the processor. → SIM-maps and mobile networks.
• 🔄 Background Disconnect: Close all applications through Recent and turn off background activity in Settings → Battery → Optimizing the battery.
• 🌙 Dark subject: AMOLED-Redmi 9 doesn’t have screens, but the dark theme still reduces the load on the screen. GPU. Included in Settings → Screen. → Dark subject.
• 🔌 Charging in the off state: If the smartphone is turned off, it charges 10-15% faster due to the absence of background processes.

Also, you should pay attention to the temperature regime, if you charge your smartphone in the sun or near a heat source, the charging speed will automatically decrease, and the optimal temperature for fast charging is 20-35 ° C.

🔹 Experimental method: Some users claim that disabling the Mi-Cloud function speeds up charging. → Accounts. → Mi Cloud and temporarily disable synchronization.

7. Frequent mistakes and how to avoid them

Many users make common mistakes that make fast charging not work, and here are the most common ones:

• 🔌 Use of unoriginal cable: Cheap cables often don't support high currents. Check the labeling - there should be a logo USB-IF Or the Quick Charge.
• 📵 Charging while playing games: If you play heavy games (such as Genshin Impact or Call of Duty Mobile), your smartphone will charge slower due to the high load on the processor.
• 🔋 Ignoring updates: In new versions MIUI Fix charging bugs often. Check updates once a month.
• 🔄 Frequent connection/disconnection of charging: This knocks down the power controller.Try to charge the smartphone without interruptions to 80-100%.

⚠️ Note: If you're using wireless charging, don't expect high speed.Redmi 9 doesn't support Qi charging out of the box, and adapters are often power-limited 5W. For fast charging, connect only via cable.

🔹 Travel tip: If you travel frequently, buy a portable Quick Charge charger (e.g. Xiaomi Mi Power Bank 3 Pro on the Internet). 30W). It will allow you to charge the Redmi 9 in accelerated mode even without an outlet.

FAQ: Answers to Frequent Questions