How to make fast charging on Xiaomi Redmi 8: Step-by-step instructions

Xiaomi Redmi 8 is one of the most popular budget smartphones of the brand, but its owners often face the problem of slow charging. Despite the support of Quick Charge 3.0 technology, many users can not achieve the declared 18 watts due to incorrect settings, poor-quality accessories or software limitations. In this article, we will analyze all possible ways to accelerate charging, from basic to hidden MIUI functions, and also find out why even the original adapter sometimes does not work at full power.

It's important to understand: Redmi 8 battery-powered 5000 MC, and its full charging even in ideal conditions takes about 2 But if your phone is dialing up everything, 10-20% And this is a clear signal in an hour that we've tested all the methods on firmware. MIUI 12–14 They identified those that really affect speed, not just “optimize” background processes.

1. Checking components: power supply and cable

The first thing to do is make sure you use the right accessories. Xiaomi Redmi 8 supports fast 18W charging, but comes with a 10W adapter (5V/2A) with the phone. This is a marketing ploy: the manufacturer saves money and the user thinks the phone is the problem.

To charge at maximum speed, you need a power supply with Quick Charge 3.0 or Power Delivery (PD) and a USB Type-C cable with thick veins (better original or certified by Xiaomi).

• 🔌 Power supply: minimum 18W (9V/2A or 12V/1.5A). Adapters from Redmi Note will be suitable 8 Pro, POCO X3 or any marked QC 3.0.
• 🔗 Cable: must maintain current to 3A. Cheap cables "thin as a thread" limit power to 10W.
• 🔋 Port port USB on your phone: clean it of dust and debris with a toothpick (carefully!) oxidizing contacts reduces the charging speed of your phone. 30-40%.

How do you check your current charging power? Connect your phone and go to Settings → Battery. The consumption chart will show "Fast Charging" (if everything works) or "Normal Charging" (if the power is below 10W).

2. Enabling fast charging in MIUI settings

Yes, there are hidden options in MIUI that can block fast charging -- even if you have the right adapter -- that's designed to extend battery life, but in practice, it's just a hindrance. Here's how to turn them off:

1. Go to Settings → Battery → Battery settings.
2. Find the option “Optimize charging” (or “Adaptive charging” in new versions of MIUI) and turn it off.
3. Return to the main Settings menu → Additional (or Special Features) and select Battery Lab.
4. Activate "Accelerated charging" (if there is no point - your firmware does not support it).

After this manipulation, restart your phone. If the Battery Lab does not have an "Accelerated Charging" option, then your version of MIUI does not include it - this is normal in some regions (for example, European firmware often does not have this option).

Turn off "Optimize charging" | Check "Battery Lab" |Reboot phone after changes |Use original cable-->

3. Clean USB port and battery contacts

One of the most common causes of slow charging is poor contact, and dust, moisture, or oxidation on a Type-C connector or battery contacts can reduce power by 50 percent or more. Here's how to fix this:

• 🧹 Clearing the port USB: Use a wooden toothpick (not metal!) or compressed air. Don't blow with your mouth - saliva will speed up corrosion.
• 🔧 Battery contacts: If you've been disassembling your phone, check if the spring contacts on the motherboard are bent. They should be tightly pressed against the battery.
• 💧 Corrosion: If the contacts have green coating, clean them with alcohol and cotton swab. After drying the phone 12+ hours.

⚠️ Note: If the port is cleaned after cleaning USB You're going to be a backlash, and you're not going to bend it yourself, and you're going to break your contacts. You're going to have to replace the service center connector. 500-800 ₽).

4. Disconnect background processes and “smart” optimization

MIUI aggressively optimizes background processes, which sometimes interferes with fast charging, and the system can artificially limit power if it thinks the phone is "heating" or "battery is worn out."

1. Go to Settings → Applications → Autostart and disable autorun for all unnecessary programs (especially instant messengers and social networks).
2. Settings → Battery → Select mode setting “Performance” instead of “Balanced” or “Charge Savings”.
3. Open Settings → Special features → Application permissions and forbid programs to work in the background.

It's also worth checking if the phone is warming while charging. If the temperature is above 40°C, the system automatically reduces the power. Use the AIDA64 app or CPU Monitor for monitoring.

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If the phone gets too hot when charging, remove the case and put it on a hard surface (not on a pillow or blanket), not only does overheating slow charging, but it also reduces battery life by 20-30% per year.

5. Update firmware and reset settings

Sometimes slow charging is associated with firmware bugs. For example, MIUI 12.0.3 for Redmi 8 was a glitch that caused the phone to not recognize power supplies more powerful than 10W.

• 📱 Update the firmware: go to Settings → The phone. → Update the system and install the latest version.
• ⚙️ Resetting: If the update didn’t help, reset to factory settings (Settings) → Additionally. → Recovery and reset) Attention: Pre-save data!
• 🔄 Fastboot Flashing: If the problem persists, the partition may be damaged EFS. This is a good way to use the Mi Flash Tool.

After resetting, don't restore data from the backup - this can bring back old bugs. Install applications manually.

Checking the status of the battery

If all previous methods failed, the problem could be battery wear, and over time, the battery capacity decreases, and the charging controller starts to limit the current to avoid overheating.

1. Install the AccuBattery app (free on Google Play).
2. Charge your phone to 100 percent and check the Healthy Battery score, and if it's below 80 percent, it's time to change the battery.
3. Check the charging current in real time, if it doesn't go above 1000 mA (1A), the battery or controller is a problem.

⚠️ Warning: If the battery is swelling (the phone's body is arching), stop using it immediately! The bloated battery may ignite. Replace it at the service center (cost for the Redmi 8 is about 1500-2000). ₽).

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If the battery health in AccuBattery is below 75%, fast charging will not work properly even with the right adapter, in which case the only solution is to replace the battery.

7. Alternative methods of accelerating charging

If the standard methods do not give a result, you can try non-obvious tricks:

• ❄️ Airplane Charging: Turn on Flight Mode before connecting to the network. Lack of network activity reduces the load on the processor, and charging is faster.
• 🔌 Power Bank usage: some external batteries (e.g. Xiaomi Mi Power Bank 3 Pro) support QC 3.0 and can charge your phone faster than a power outlet.
• 🔧 Engineering menu: enter the code ##4636##, select "Battery Information" and check the setting AC If it shows the False, the problem is the power controller.

Another radical method is to turn off the quick charge in the engineering menu (yes, this sounds contradictory, but sometimes helps).

1. Enter ##6484## (not working on all firmware)
2. Select "MBAT TEST."
3. Find the "Fast Charge" and turn it off.
4. Reboot your phone and turn on fast charging again through the settings.

This method resets the power controller cache, which sometimes solves the problem of "hanging" at low power.

FAQ: Frequent questions about charging Redmi 8