How to turn on fast charging on Xiaomi Redmi 4X: all the ways and nuances

Xiaomi Redmi 4X is one of the most popular budget smartphones of the brand, but many users still do not know how to use its capabilities. The issue of fast charging is especially relevant: the model supports Quick Charge 2.0 technology, but by default the function can be disabled or work incorrectly. In this article, we will understand how to check compatibility, activate accelerated charging through the MIUI settings, and what nuances it is important to consider so as not to reduce the battery life.

It’s worth clarifying right away: Redmi 4X doesn’t support modern standards like Quick Charge 3.0/4.0 or PD (Power Delivery), but even with QC 2.0, you can reduce charging time by 30-40% compared to a standard adapter. The main thing is to properly configure your smartphone and use compatible accessories. If you still charge your phone for 4-5 hours, this instruction will help reduce the process to 1.5-2 hours.

1. Check support for fast charging on the Redmi 4X

Before you try to enable Quick Charge, make sure your Redmi 4X supports this technology at all. Not all model modifications have the necessary charging controller.

• 🔍 Smartphone modification: Fast charging is only available for the version with Snapdragon 435 processor (models) MTK Helio X20 supportive QC). You can find the chipset in the application AIDA64 (section CPU) Or through settings: About the phone → Model and hardware platform.
• 📋 Firmware: On older versions MIUI (below 9.5) the function could be disabled software. Update the system to the latest available version via Settings → The phone. → Updating the system.
• ⚡ Battery: If the battery is severely worn out (capacity below 70% of nominal), the smartphone can automatically lock Quick Charge for safety. AIDA64 → Battery.

If your Redmi 4X meets all the criteria, but fast charging doesn’t work, the problem may be in the power supply or cable.

2.What Chargers Are Suitable for Quick Charge on Redmi 4X

The Redmi 4X supports Quick Charge 2.0 only when using an adapter with an output voltage of 5V/2A, 9V/1.67A or 12V/1.2A. The standard unit from the kit (5V/2A) does not provide accelerated charging - it just provides maximum current for normal mode. To activate the QC 2.0, you need an adapter with support for the corresponding protocol.

Here are the proven options for chargers compatible with the Redmi 4X:

Important: Even with the right adapter, fast charging may not start if you use a poor-quality cable. QC 2.0 requires a data-enabled wire (usually USB 2.0 High-Speed or higher) The best option is the original Xiaomi cable or a certified USB-IF.

⚠️ Warning: Do not use cheap no-name adapters with claimed Quick Charge support. They often fall short of standards and can damage the smartphone's power controller.°C, unstable voltage, lack of certificates (CE, RoHS).

3. Step-by-step instructions: how to enable fast charging in the MIUI settings

If you already have a compatible adapter, but the Redmi 4X still charges slowly, it's possible that Quick Charge is disabled in the software settings. Depending on the version of MIUI, the path to the option may differ.

Method 1: Using "Additional settings" (MIUI 9–11)

1. Open Settings → Battery and Performance.
2. Slip on Battery Settings (or Charge in some firmware).
3. Find the Quick Charge option (could be called Quick Charge or Accelerated Charging) and activate the switch.
4. Confirm the action if a heat warning appears.

Method 2: Through the "Laboratory" (MIUI 12 and later)

In newer versions of MIUI, the fast charging option can be hidden in experimental features:

1. Go to Settings. → The phone.
2. Tap 7 times on the MIUI version to activate Developer Mode.
3. Return to the main settings menu and open additionally → Laboratory.
4. Find the Accelerated Charging and turn it on.

If you don't have any of these things in your firmware, then Quick Charge is automatically activated when you connect a compatible adapter, in which case, check if the icon is on the lock screen. ⚡ Fast charging – if yes, the function works.

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If the smartphone gets warmer after activating fast charging, try removing the case while charging or using a less powerful adapter (for example, 9V/1.67A instead of 12V/1.2A).

4.Why fast charging doesn't work: Common problems and solutions

Even after all the settings, Quick Charge may not start, and here are the most common reasons and ways to fix them:

• 🔌 Incompatible cable: Check if yours supports USB-data cable (try connecting your smartphone to your PC – if defined as a drive, the cable fits).
• 🔋 Worn-out battery: If the battery capacity falls below 70%, the system can lock QC. Replace the battery or use a standard charge.
• 📱 Overheating: At a battery temperature above 40°C fast charging automatically shuts down. Let the smartphone cool down.
• 🛠️ Damaged port USB: Oxidation or contamination of contacts may disrupt the transmission of data required for activation. QC. Clear the port with alcohol.
• 🔄 Firmware failure: After update MIUI You can reset your settings. You can try resetting your settings. → System system → Resetting settings → Reset the charging settings.

If none of these methods worked, try flashing your smartphone to a newer version of MIUI via Fastboot or Recovery, and sometimes the problem is that the system files that manage power are bugged.

5.How to check that fast charging is actually working

Many users think their Redmi 4X charges fast, but it's actually standard mode. Here's how to tell if Quick Charge 2.0 is activated:

1. Icon on the lock screen: When connecting a compatible adapter, the inscription “Fast Charge” or “Quick Charge” should appear next to the battery indicator.
2. Charging speed: Take a time note: 🔋 0-50%: In mode QC Smartphone should score 50% in 30-40 minutes. 🔋 50–100%: The last half charges more slowly (even more) ~40-50 minutes).

Monitoring annexes:

AccuBattery

Ampere

QC 2.0

1500-1800 m

800-1200 m

If the charging speed is less than 1000 mA, then the Quick Charge is not activated. Go back to the previous sections and check all settings again.

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Fast charging on the Redmi 4X only works up to 80-90% of the battery capacity, and then the smartphone automatically goes to standard mode to reduce the load on the battery.

6.Alternative ways to speed up charging (if QC is not available)

If your Redmi 4X doesn’t support Quick Charge (like the Helio X20 version), you can speed up charging a bit with other methods:

• ⚡ Aircraft mode: Disconnect all wireless modules (Wi-Fi, Bluetooth, GPS) Or activate the plane mode, which will reduce power consumption by 15 to 20%.
• 🔌 Quality cable: Use short cable with thick veins (e.g., high-quality cable, USB-C to USB-A The thinner and longer the wire, the greater the loss of current.
• 📵 Turn off background: Close all applications, especially those using the internet or GPS (Navigators, messengers, games).
• 🔋 Cooling: Put your smartphone on a hard, cool surface (like ceramic tiles.

These methods will not replace Quick Charge, but can reduce charging time by 20-30 minutes. For example, with a standard adapter (5V/2A), the smartphone will charge not 4 hours, but 3-3.5 hours.

7.Myths and truths about fast charging on Xiaomi Redmi 4X

There's a lot of rumors going around Quick Charge, and we'll figure out what's true and what's fiction.

The most pernicious myth is that the Quick Charge can be turned on on on any Redmi 4X model via an engineering menu. In fact, if the device does not support the technology at the iron level (charging controller + battery), no settings will help. At best, you will get a standard charge, at worst, damage the battery.

Frequently Asked Questions (FAQ)