Why Xiaomi is charging badly: all the reasons and how to fix it

Introduction: When Slow Charging is Not the Norm

Have you connected a Xiaomi Redmi Note 12 or POCO X5 Pro to a charger, but after an hour on the screen only 20% instead of the promised 50%? or the smartphone refuses to charge at all, showing the message “Charge suspended”? This problem is familiar to many owners of Xiaomi equipment, and it is not always associated with battery wear. 60% of cases are to blame for software restrictions, inappropriate adapters or mechanical damage that can be fixed on their own.

In this article, we’ll look at all the possible reasons Xiaomi might be charging badly, from the cluttered contamination of the connector to the hidden MIUI settings that slow things down. You’ll learn how to diagnose the problem by the symptoms, what tools you’ll need to repair it, and when to carry the phone to the service. And at the end, you’ll find a 7-step checklist that will help restore normal charging in 10 minutes.

Spoiler: If your Xiaomi only charges when it's off or if it says "No Charging is supported," the problem isn't with the battery, it's with the power controller or the firmware. And that's fixable!

1. Battery wear: how to check and what to do

The lithium polymer batteries in Xiaomi smartphones are designed for 500-800 full charge cycles. After that, the capacity begins to fall, and the charging time increases. For example, a Redmi 9 with a worn-out battery can charge 2-3 times longer than a new one, even if the original adapter is used.

How do you know if the battery is to blame?

• 🔋 The phone is discharged in 3-4 hours with moderate use.
• ⚡ Charging "jumps": 80%, then 56%, then again 72%.
• 🔥 The body warms more than usual during charging.
• ⏳ Charging up to 100% takes more than 3 hours (with an adapter) 18W+).

Check the wear of the battery through the hidden menu of engineering settings:

1. Open the Phone app.
2. Enter the combination ##4636##.
3. Go to the Battery Information tab.
4. See the setting Level of wear (if any) or Condition.

If the health value is below 70%, the battery should change. For models Xiaomi 2020-2023 (for example, Mi 11 or POCO F3) critical threshold is considered 65% – with this wear, the controller begins to artificially limit the charging current to extend the life of the battery.

⚠️ Note: Do not use applications like AccuBattery for diagnostics, they show approximate data. The exact wear and tear can only be found through the engineering menu or specialized equipment in the service.

2.Problems with charger and cable

In 30% of cases, slow charging is due to unoriginal adapters or damaged cables, for example, if you use an iPhone cable with a 5W adapter for the Xiaomi 12T (which supports 120W), the phone will charge 10-15 times slower.

How to check the charger:

• 🔌 Connect another adapter (preferably the original Xiaomi with the labeling) MDY-12-...).
• ⚡ Try charging another phone with the same adapter – if it’s also charging slowly, the power supply is a problem.
• 📱 Look at the screen while charging: if instead of “Fast Charging” it says “Charging”, then the adapter does not support the desired power.

Please note the cable marking:

If you are using wireless charging, make sure that:

• 🧲 The charging station supports Qi 1.2.4 standard+ (for Xiaomi 2021-2026.).
• 📱 The phone lies strictly in the center (shift by 5 mm reduces power by 30 mm%).
• 🔋 On the phone removed a case thicker than 3 mm (metal cases block charging).

💡

If the adapter is warmer than the phone, it's a sign of a malfunction, and it can not only slow the charge, but also damage the battery.

3.Contamination of the USB-C connector: cleaning and repair

Xiaomi’s USB-C connector is one of the most vulnerable places, and dust, pocket pile, or contact oxidation can cause the phone to charge with jerks or refuse to take power at all, especially for models with a leaky body (Redmi 9A, POCO M3).

Signs of a contaminated connector:

• 🔌 Charging is interrupted at the slightest movement of the cable.
• ⚡ The phone determines the connection/disconnection of the cable for no reason.
• 📱 A “Moisture in the connector” notification appears on the screen (even if it is not there).

How to clean the connector yourself:

1. Turn off the phone.
2. Take a toothpick from wood (not metal!) and carefully remove visible debris.
3. Moisten the cotton swab in isopropyl alcohol (90%+) and wipe the contacts.
4. Allow the connector to dry for 10-15 minutes before connecting the cable.

⚠️ Warning: Do not use compressed air (canisters) - this can drive dust deeper into the connector and damage the chips. Also avoid wet wipes - they leave a divorce, which will oxidize the contacts.

If the problem persists after cleaning, it is possible that the connector is mechanically damaged (for example, bent "tongues" inside), in this case, only replacing the connector in the service will help. The average cost of repair for Xiaomi is 1,500-3000 ₽ (model-wise).

4. Software restrictions: hidden MIUI settings

MIUI (especially versions 12-14) actively limits charging to extend battery life, and these limitations can work even on new phones if:

• 🔋 Optimized Charging Mode (limited to 80%).
• ⚡ Phone overheats (MIUI automatically reduces current).
• 📱 Background restrictions work to save energy.

How to disable restrictions:

1. Go to Settings. → Battery.
2. Put it on the icon. ⚙️ (battery settings).
3. Turn off the optimised charging option.
4. In the section Power modes, select High performance.

If the phone still charges slowly, check the background processes:

• 🔄 Close all applications through the recent.
• 🚫 B Settings → Annexes → Battery management disable restrictions on system processes.
• 🔧 Reset the settings. MIUI before the factory (if the problem occurred after the update).

For Xiaomi models with Snapdragon 8 Gen 1/2 processor (for example, Xiaomi 12 Pro, POCO F4 GT) is characterized by the problem of “thermal trottling”: at a battery temperature above 40 ° C, the system forcibly reduces the charging power to 5-10W. The solution is to charge the phone in a cool room or use a cooling stand.

5. Damage to the power controller or motherboard

If all previous methods did not help, the problem may lie in a hardware malfunction:

• 🔧 Charging controller (microchip) BQ25890 or similar, which controls the current and voltage.
• 📱 Damaged tracks on the motherboard (often after falling or getting moisture).
• ⚡ Faulty. DC-DC Converter (responsible for distribution of power).

Symptoms of hardware breakdown:

• 🔌 The phone is charged only when it is off.
• ⚡ The error appears on the screen: Charging is not supported».
• 📱 Charging comes only from a certain cable / adapter.
• 🔥 The phone is very warm in the area of the camera (there are power elements).

Diagnosis and repair:

1. Connect your phone to your PC via USB and check if it is defined as a charger (if not, the problem is in the controller).
2. Try charging from the power bank - if charging is normal, the power supply or socket is to blame.
3. If nothing works, contact the service.

⚠️ Warning: If the phone stopped charging after falling or getting moisture, don't try to disassemble it yourself! corrosion on the board can lead to short circuit and complete loss of the device.

6. Effect of temperature and humidity on charging

Xiaomi is equipped with thermal sensors that block fast charging at extreme temperatures, the optimal range for charging is from 10 ° C to 35 ° C. When you go beyond these limits, the system automatically reduces current or even stops the process.

What to do if the phone overheats:

• 🌡️ Charge the device in a shadowed place (not on a windowsill or near the battery).
• 🧊 Remove the case (especially silicone or thick).
• 🔋 Do not use your phone while charging (games, videos eat up to 30% of power).
• ❄️ If the phone overheats, let it cool to 30.°C before charging connection.

Signs of overheating:

• 🔥 Hot housing (over 40)°C) in the region of the processor or camera.
• ⚡ Charging is jerky or stops at 80-90%.
• 📱 Notification: Battery temperature is high».

For liquid-cooled models (Xiaomi Black Shark, POCO F5), temperatures above 45°C are critical, with the controller completely turning off charging until cooling, in which case only external cooling (such as a fan or cooling stand) will help.

💡

If the phone only charges up to 80% and stops, it's not a breakdown, it's MIUI's Optimized Charging feature, which you can turn off in the battery settings.

7. Update firmware and reset settings

Sometimes slow charging is associated with firmware bugs, especially after major MIUI updates. For example, in the version of MIUI 14.0.4 for the Redmi Note 11, there was a bug that caused the phone to only charge 5W instead of 33W.

How to update firmware:

1. Go to Settings → About the phone → System update.
2. Click Check for updates.
3. If a new version is available, download and install it.

If the update didn’t help, try resetting the settings:

• 🔄 Settings → Additionally. → Recovery and discharge → Resetting settings.
• 📱 Select Reset all settings (does not delete files, only settings).
• 🔋 After resetting, the charging should be restored.

For advanced users: if the problem has appeared after the update, you can roll back to the previous version of MIUI via Fastboot.

fastboot flash recovery recovery.img


fastboot reboot recovery



In recovery, select “Install update” and specify the path to the old firmware

⚠️ Attention: Firmware rollbacks can cause data loss and lock the bootloader. Do this only if you are confident in your actions!

FAQ: Frequent questions about Xiaomi charging