How to enable fast charging on Xiaomi Mi 8: all the ways and nuances

Xiaomi Mi 8 is one of the most popular flagships of the brand, but many users face a problem: the smartphone does not charge quickly, despite the support of Quick Charge 4+ technology. The reason lies not only in settings, but also in components, firmware or even cable. In this article, we will analyze all the working ways to enable fast charging, check the compatibility of chargers and tell you how to avoid typical errors.

It is important to understand that the Mi 8 supports fast charging up to 27 watts, but by default can work in standard mode (5V/2A). This is due to battery life savings or incorrect settings. We tested all methods on MIUI 10-14 firmware and identified key points that affect charging speed.

If your smartphone charges for longer than 1.5-2 hours from 0% to 100%, then fast charging is either disabled or inefficient.

1. Checking the compatibility of the charger and cable

Before you change settings, make sure your charger and cable support Quick Charge 4+ or USB Power Delivery (PD).

• 🔌 Outlet charger 5V/3A, 9V/2A or 12V/1.5A (power-marking).
• 🔗 Cable USB Type-C with support 5A (Usually come complete with flagships Xiaomi or Qualcomm).
• ⚡ Stable voltage socket (220V) ±10%).

If you're using a non-original power supply, check it on another Quick Charge device, like the Xiaomi Mi 9 or the POCO F1, which also support this technology, and fakes often pose as "fast," but in fact only give you 5V/2A.

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To check the actual charging power, install the AccuBattery app (Play Market) that will show current and voltage in real time.

Critical moment: Xiaomi Mi 8 does not support fast charging through USB-port of the computer or power bank without PD. Maximum - 10W (standard mode).

2. Enabling fast charging in MIUI settings

In MIUI 12 and later, the fast charging option can be hidden or disabled by default to activate it:

1. Open Settings → Battery and Performance.
2. Slip on Charging (or Charging Settings in older versions).
3. Find the Fast Charging item and move the slider to the right.
4. If there is no option, check the section Additional → Charging Optimization.

On MIUI 10–11, the path may differ: Settings → Battery → Settings → Enable Fast Charging.

Use the original cable | Connect the power supply to the socket | Check the temperature of the smartphone (not higher than 35 ° C) | Disable charging optimization in the settings-->

If the fast charging point is not available at all, this may mean:

• 📱 Installed custom firmware without support QC.
• 🔧 In the developer settings, charging optimization is disabled.
• 🔋 Battery worn out (capacity below 70% of nominal value).

Official. MIUI (stable)|Official. MIUI (beta)|LineageOS (Pixel Experience)|other-->

3. Checking the developer's settings

In some cases, fast charging is blocked by system constraints that can be removed through the developer mode to activate it:

1. Go to Settings. → The phone.
2. Tap 7 times on the MIUI version.
3. Return to the main settings menu and a new section for developers will appear.

Next:

1. Open the Settings. → For developers.
2. Find the charge limit or charge optimization item and turn it off.
3. Reboot the phone.

If there is a USB configuration option in the developer menu, set the Charge value (not MTP or PTP).

⚠️ Attention: Disabling the optimization of charging in developer mode can reduce battery life. Use this method only when necessary.

4. Update firmware and reset settings

If fast charging doesn't work despite all the manipulations, the problem may be in outdated firmware or system files failure. MIUI:

1. Go to Settings → About the phone → System update.
2. Click Check Updates and install the latest version.

If there are no updates but the problem remains, reset (without data loss):

1. Open Settings → Additional → Recovery and Reset.
2. Select Resetting (not Resetting to Factory!).
3. Confirm the action and restart the phone.

After reset, check your charging settings again. If the problem is in corrupted system files, you may need to completely flash through Fastboot or Recovery.

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Updating the firmware often solves problems with Quick Charge, especially if there was a beta version of MIUI or custom build before.

5. Diagnosis of battery and temperature

Xiaomi Mi 8 automatically disables fast charging if:

• 🌡️ Battery temperature above 40°C or below 0°C.
• 🔋 Battery capacity fell below 70% of nominal value (checked in AccuBattery).
• 🔌 Uncertified cable or power supply is used.

To check the status of the battery:

1. Install the AIDA64 application (Battery section).
2. Look at the parameters Temperature, Wear Level and Technology.
3. If the wear exceeds 30%, the battery needs to be replaced.

To cool the phone while charging:

• 📵 Close all background apps (especially games and navigators).
• 🧊 Remove the cover (if any).
• 🌬️ Place your phone in a cool place (but not in the refrigerator!).

⚠️ Warning: If the phone is heated above 45°C during charging, this may indicate a malfunction of the power controller.

6. Alternative methods of accelerating charging

If the standard methods did not help, try these techniques:

• ⚡ Aircraft mode: Disables all radio modules (4G, Wi-Fi, Bluetooth, reducing CPU load and speeding up charging by 10-15%.
• 🔕 Disconnect Sync: Go to Settings → Accounts and temporarily deactivate autosynchronization.
• 🎮 Closing games: Apps like PUBG Genshin Impact consumes up to 30% charge per hour even in the background.

You can also use special applications for charging management, for example:

• Battery Charge Limit (limits the charge to 80% to extend the life of the battery)
• Quick Charge Checker (shows if QC mode is enabled)

But remember: third-party utilities require root rights, which cancels the warranty and can lead to system failures.

FAQ: Frequent questions about fast charging on Xiaomi Mi 8