“Slow charging” on Xiaomi: why the inscription appears and how to speed up charging

You plugged Xiaomi into a charger, but instead of the usual “Fast Charging” or percentage, the screen says “Slow Charging”? It’s not just an annoying bug — a signal that the smartphone is getting less power than it could, as a result, the battery charges 2-3 times longer, and when used actively, it can even discharge while connecting to the network.

In this article, we will look at all possible causes, from the commonplace damaged cable to the hidden settings of MIUI firmware that limit current, how to diagnose a problem in 5 minutes (no phone parsing!) and what to do in each case, and at the end, answers to the frequent questions that users ask in service centers.

1. Problems with charger or cable

In 60% of cases, the charger kit is not the fault of the smartphone itself. Xiaomi manufacturers (and other brands) often save on components, especially in budget models. Even the original power supply can fail after 6-12 months of active use.

How to check:

• 🔌 Use a different cable and power supply. Take a known work kit (for example, from another device that supports Quick Charge or Power Delivery). If the label "Slow Charging" is gone, the problem is accessories.
• 🔍 Check the cable for damage, bending, bare wires or melting marks at the base of the USB-Type C connector are a sure sign of malfunction, especially the spots near the plug.
• 📱 Check the phone's connector. Take a flashlight and inspect the charging port for debris, oxidation, or bent contacts. Xiaomi Redmi Note 10 and POCO X3 particularly sensitive to pollution.

If you use wireless charging, consider that even the original Mi Wireless Charging stations often limit power to 5-10 watts when the smartphone is positioned inaccurately. Try moving the phone in the center of the charging pad.

⚠️ Cables: Cheap Cables Without Certification USB-IF Not only can slow down charging, but also damage the smartphone’s power controller.It is especially dangerous to use “no-name” accessories with Xiaomi. 11T Pro and Black Shark – These models are sensitive to voltage surges.

2. Power mismatch of the power supply

Xiaomi is pushing fast-charging technologies like Fast Charge, HyperCharge, Turbo Charge, but they need a power supply with a certain amount of power.

If you plug the Xiaomi 12 Pro (which supports 120 watts) into a 10 watt power supply, the system automatically restricts the current, and it says "Slow Charging." The same thing happens if you use it. USB-Computer port (usually no more than 2.5-5 watts).

Decision:

• 🔋 Buy a power supply with power not lower than the one listed in the table for your model. POCO A mid-range (like the Note 11 Pro) will be 33 watts long.
• 💻 If you charge from a PC/laptop, use the port. USB 3.0 (usually blue) – it gives more current than USB 2.0.

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On some models (for example, Xiaomi Mi 11) you can force the fast charging mode even with a non-original unit. To do this, go to Settings → Battery → Charging settings → Enable fast charging (if the option is available).

3. Program Restrictions in MIUI

MIUI (Xiaomi firmware) has several hidden features that can artificially slow charging.This is done to extend battery life, but often works too aggressively.

Where to look for settings:

1. Settings → Battery → Charging Modes: – Optimized Charging option** can limit current to 80% (so that the battery doesn’t wear out). – Turn it off if you want maximum speed.
2. Settings → Special features → Fast charging (not available on all models): - Here you can manually choose Standard (slow) or Turbo (fast).
3. Settings → Additional → For developers → Background Limitation: – If enabled, the system can reduce charging power during active processes.

Also, some firmware has a hidden temperature limit. If the smartphone heats up above 40°C (for example, while playing), MIUI automatically reduces the current. Check the temperature in the Settings menu → Battery → Battery status.

4. Damage to the battery or power controller

If all external causes are ruled out, but Xiaomi still writes “Slow Charging,” the problem may lie in the hardware:

• 🔋 Battery wear. After 500 to 800 charging cycles, the battery capacity drops by 20 to 30 percent, and the controller limits the current to avoid overheating. Check the wear and tear in the Settings menu. → Battery → Battery status (if optional) or via AccuBattery.
• 🌡️ Battery overheating: If the smartphone heats up even in a simple one, it could indicate battery bloating, a dangerous condition that requires immediate replacement.

How to check the wear of the battery:

1. Install the AccuBattery app from Google Play.
2. Charge your phone to 100% and wait until it is completely discharged (before it is turned off).
3. In the Battery Health section,** the app will show the actual capacity, and if it's below 80 percent of the factory capacity, you need to change the battery.

⚠️ Warning: If the battery is swelling (visible on the raised screen or body), you can't keep using the phone! This is a risk of fire.

5. Effects of Background Processes and Applications

Few people know, but active processes can reduce the charging speed.

• 🎮 Games or video rendering: The processor and the graphics accelerator consume so much power that charging doesn't have time to compensate for the expense.
• 📱 App Update. Google Play or Mi App Store in the background download updates, loading the network and processor.
• 📶 Weak network signal: If a phone is constantly searching for a network (for example, in the subway or outside the city), this increases power consumption.

How to eliminate:

Close all applications through the multitasking menu

Turn on the "In the plane" mode for the time of charging

Turn off automatic application updates

Close games and resource-intensive programs (such as Genshin Impact or Lightroom)

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Also check the battery consumption by application in the Settings → Battery → Battery Use menu. If an application consumes >10% in the background, limit its activity.

6 Problems after MIUI update

MIUI firmware updates sometimes bring not only new features but also charging bugs. For example, after the release of MIUI 14, many users of Xiaomi 12T and Redmi K50 complained about artificial current restriction to 5W.

What to do:

• 🔄 Reboot your phone, sometimes a simple reboot helps.
• 📲 Reset the battery settings (see spoiler in Section 3).
• 🛠️ Reverse to the previous version MIUI (If the problem has occurred after the update:

1. Download the archive with firmware (for example, from the site xiaomifirmwareupdater.com).


2. Go to Settings → About Phone → System Update.




3. Click on three dots in the upper right corner → “Select firmware file”** and specify the downloaded archive.




4. wait until the process is completed (the data will not be erased).

If the rollback didn’t help, contact Xiaomi via the official chat or Mi Community forum.Include the phone model, MIUI version and a description of the problem – sometimes patches are posted.

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Before rolling back the firmware, back up your data via Settings → System → Backup. In rare cases, a reset can result in file loss.

External factors: temperature, humidity, magnetic fields

Even if the phone and charging are fine, the external environment can affect the speed of:

• ❄️ Low temperature, if you charge your smartphone in the cold (below) +5°C), lithium-ion batteries lose their ability to take charge quickly. Xiaomi automatically reduces current to avoid damage.
• 🧲 Magnetic interference. Don't put your phone on charge next to speakers, microwaves or wireless speakers -- they create interference that can knock off the power controller.

Decision:

Charge Xiaomi at room temperature (15-30°C), away from heat sources and electromagnetic fields. If the phone overheats, let it cool for 10-15 minutes before connecting to the network.

FAQ: Frequent questions about Xiaomi's slow charging