Why Xiaomi Charges Slowly – A Complete Discussion of Causes and Solutions

You plugged Xiaomi into charging, but the battery percentage crawls like a turtle, and an hour later, the same 30% on the screen? Slow charging is one of the most common problems for smartphone owners of this brand, and the reasons can lie in both banal wear and tear accessories, and hidden software failures. In this article, we will analyze all the possible factors affecting the charging speed, from obvious to exotic, and give step-by-step instructions for diagnosis and troubleshooting.

It's important to understand that if your Redmi Note 12 or POCO X5 charges longer than before, it doesn't always mean that it's a failure, sometimes it's background processes, incorrect energy saving settings, or even the ambient temperature, and we can help you identify the root of the problem without going to the service center — saving you time and money.

Based on user reports, Xiaomi technical documentation, and tests on real-world devices (including models that support fast charging up to 120W), there are no general tips here, only specific solutions explaining why they work.

1. Problems with charger and cable

The first thing to check is the charging kit. Even Xiaomi original accessories wear out over time, and uncertified ones may not match the declared specifications, for example, a cable with damaged wiring or oxidized contacts reduces current to 30-50% of the nominal.

How to diagnose:

• 🔌 Try another charger (preferably original or from a proven brand, such as Anker or Baseus). If the speed has increased, the power supply is a problem.
• 📱 Connect the cable to another device, and if it's also charging slowly, the cable is faulty.
• 🔍 Check the connector. USB-C on phone and cable: Pollution, bent contacts, or rust can interrupt the connection.

Critical: cheap cables without USB-PD (Power Delivery) support are physically unable to transmit current above 2A, even if the power supply is powerful, as is the case with many no-name accessories with AliExpress.

⚠️ Attention: If you are using USB-Hub or extension cord, check them separately. Many hubs limit current to 0.5A, which is 10 times slower than standard charging.

2. Energy saving and background activity settings

Xiaomi aggressively optimizes power consumption, and sometimes these settings conflict with the charging process. For example, Super Power Saving mode can limit current to 1A even if the phone is connected to a powerful adapter.

How to check:

1. Open Settings → Battery and Performance → Energy Saving Modes.
2. Turn off all modes (Balance, Energy Saving, Super Energy Saving).
3. Restart your phone and check the charging speed.

Another common cause is background processes, and if the navigator is running, the game is running, or the applications are being updated, the power controller can reduce the current to avoid overheating, to rule out this factor:

Close all applications through the latest task menu

Turn off mobile data and Wi-Fi

Turn off geolocation (GPS)

Check the temperature of the phone (should be ≤ 35°C)-->

MIUI also has a hidden Charging Optimization feature that artificially slows the process after 80% to save battery life.

1. Go to Settings → Battery and Performance → Battery Settings
2. Find the charge optimization item and deactivate it.

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If after optimizing the phone still charges slowly, try resetting the battery settings: Settings → Applications → Application Management → Three dots (menu) → Reset the application settings

3. Overheating or low temperature

The power controller in Xiaomi smartphones automatically reduces the current if the battery temperature goes beyond 10–45 ° C. At the same time, a warning may appear on the screen Charging is suspended. The battery temperature is too high / low.

What to do:

• ☀️ Overheating: Remove the case, turn off the phone for 10-15 minutes, avoid direct sunlight.
• ❄️ Hypothermia: Charging in the cold below -10°If the phone is cold, hold it in your hands for 5-10 minutes.
• 🔥 Internal overheating: Check if the processor is warming up (start) CPU Monitor from Google Play if core temperature is above 60°C – App or virus may be to blame.

⚠️ Warning: If the phone is heated even when it is off when connected to charging, it may indicate a power controller malfunction or a short circuit in the battery!

To diagnose the battery temperature:

1. Enter the combination in the Phone app: ##4636##.
2. Select Battery Information.
3. Look at the temperature parameter (normal: 25-40 ° C).

4. Battery wear and controller errors

Lithium-ion batteries degrade over time. After 300 to 500 charging cycles, their capacity decreases by 20 to 30 percent, and internal resistance increases, which directly affects charging speed. If your Xiaomi is older than 2 years, chances are that the battery is worn out.

How to check the status of the battery:

• 📊 Use the AccuBattery app (showing real capacity and wear).
• 🔧 Enter the engineering code: ##6484## → Battery Info (not available on all models).
• 🔄 If the capacity has fallen below 80% of the nominal - it is time to change the battery.

Another possible problem is that the charging controller fails, and it may misidentify the type of adapter that's connected, or it may limit the current due to false alarms.

• The phone is charged with shocks (fast, then slow).
• Charging is interrupted by 50-80%.
• When connected to a PC, the current drops to 0.1–0.3A.

Decisions:

1. Reset battery settings: Settings → Applications → Application management → Three points → Reset application settings.
2. Firmware Update: Sometimes controller bugs are fixed in newer versions of MIUI.
3. Battery replacement: If the wear is more than 30%, no settings will help.

5. Software failures and viruses

If the hardware checks fail, the problem may lie in firmware or malware, for example, some viruses disguise themselves as system processes and consume up to 50% of the charge per hour, which causes the controller to limit the charging current.

How to diagnose:

• 🛡️ Check your phone for viruses with Malwarebytes or Dr.Web Light.
• 🔄 Remove recently installed apps (especially from third-party sources).
• 📱 Reset the settings to factory (Settings) → The phone. → Resetting settings).

Updates MIUI They can also make bugs, like when you're out. MIUI 14 Many Redmi Note 11 users complained about slow charging due to an error in the controller driver:

• 🔄 Reverse to the previous firmware version (via Fastboot or Mi Flash Tool).
• 🔧 Manual patch installation (if available).
• 📡 Waiting for the official fix (watch out for announcements on miui.com).

⚠️ Note: If after resetting the problem disappeared, but returned after recovering data from the backup, it is the fault of one of the applications or its cache.

Hardware malfunctions: from the connector to the motherboard

If all the previous steps didn't work, it could be a physical breakdown.

To diagnose hardware problems:

1. Connect the phone to your PC and check if it is defined as a charger (in Windows Device Manager).
2. Try charging your phone when it's off. If you're up, it's a problem with the software.
3. Check the USB-C connector under the magnifying glass: bent contacts or black plaque is a sure sign of malfunction.

Critical point: if the phone stopped charging at all or shows an error This charger is not supported, do not try to "resuscitate" it with improvised means. This can cause the battery to burn!

7. Features of Xiaomi models with fast charging

Devices that support Quick Charge, Turbo Charge or HyperCharge (such as Xiaomi 12 Pro or Black Shark 5) have additional nuances.

• 🔌 Incompatible protocol: The power supply must support USB-PD Qualcomm Quick Charge 4+. For example, charging from the iPhone (5W) It's not gonna unlock the potential. POCO F4 GT (120W).
• 📉 Dual battery: In some models (e.g. Redmi) K50 Gaming: Two batteries charge sequentially, which can create the illusion of slow charging on the first 20%.
• 🔋 Adaptive charging: Function MI Fast Charge can shut down at high temperature or while using your phone while charging.

To check if the fast charging is working:

1. Connect the original power supply.
2. Launch the Ampere app (showing charging current).
3. Compare readings with passport data: Xiaomi 11T Pro: up to 120W (6.5A). Redmi Note 12 Pro+: up to 67W (4.2A). POCO X5: up to 33W (3.0A).

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If the current in the Ampere is below 1.5A when using the original charger, the problem is definitely not in the battery, but in the controller or firmware.

FAQ: Frequent questions about Xiaomi's slow charging