Why Xiaomi Smartphone Is Slowly Charging: A Complete Analysis of Causes and Solutions

Introduction: When Slow Charging Is a Problem

Did you connect the Xiaomi Redmi Note 12 or POCO X5 Pro to charging in the evening, and in the morning you found that the battery was only 60 percent charged? Or did the smartphone refuse to charge faster than 1% per minute, even though it used to cope with an hour? Slow charging is one of the most common complaints of owners of Xiaomi devices, but the reasons can lie in both banal battery wear and hidden software failures.

In this article, we’ll look at all the possible reasons why your Xiaomi has been charging longer than usual, from the trivial (dirty USB-C connector) to the serious (power controller malfunction), how to diagnose the problem yourself, what settings should be checked in MIUI, and when it’s time to carry your phone to the service, and we’ll also reveal one little-known nuance of the MIUI 14+ firmware, which artificially limits the charging speed on some models.

1. Battery wear is the main cause of slow charging

The lithium polymer batteries in Xiaomi smartphones are designed for 300-500 full charge cycles. After that, the capacity begins to fall steadily, and the charging time increases. If your phone is more than 2-3 years old, the probability of battery wear is closer to 80%.

How to check the status of the battery without disassembling the device?

• 📱 Enter the phone combination ##4636### in the app, then go to Battery Information. Wear level above 20% - alarm.
• 🔋 Use apps like AccuBattery (available on Google Play) to show real battery capacity and discharge rate.
• ⚡ If the phone is discharged in 4-5 hours with moderate use, and charging takes 3 hours+ The hour is a sure sign of wear.

⚠️ Warning: If the battery capacity has fallen below 70% of its nominal capacity, continued use without replacement can lead to sudden phone shutdowns even at 30-40% charge. 11T Pro and newer with support 120W Charging a worn-out battery can overheat and swell.

2.Problems with charger and cable

Even if you use Xiaomi’s native power supply, it can fail, cheap cables and adapters often fail to meet the stated specifications, for example, a 33W unit can only deliver 10W due to overheating or damage to internal components.

How to check the charger:

• 🔌 Connect the phone to another power supply with the same power (e.g, 67W If the charging speed has increased, the problem is the adapter.
• 📏 Check the cable for insulation overburden, melting or damage, especially vulnerable spots on the connectors.
• 🔍 Use it. USB-tester (e.g. tester, VC16T) measuring the actual power, if the unit is 120W lesser 60W — time to replace.

Important nuance: Starting with MIUI 13, Xiaomi smartphones can artificially restrict charging if they recognize an "unoriginal" cable. This is done for safety, but often works falsely. To get around the restriction, try:

1. Disable the option Safe Charging in Settings → Battery → More.
2. Reboot the phone with the charger connected.

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If you use wireless charging, clean the back of the phone and the charging pad of dust and grease – this can increase charging speeds by 15-20%.

3.Dirt and oxidation in the USB-C connector

The USB-C connector in Xiaomi smartphones is one of the most vulnerable places, with dust, pocket pile, sweat and even microparticles from cases accumulating inside over time, making contact worse, leading not only to slow charging, but also to data transmission problems.

How to clean the connector yourself:

1. Turn off the phone and remove it. SIM-map.
2. Take a wooden toothpick (not metal!) and carefully remove visible debris.
3. Moisten the cotton swab in isopropyl alcohol (at least 90%) and wipe the contacts. Do not use water or wet wipes!
4. Let the connector dry for 10-15 minutes before connecting the charging.

⚠️ Warning: Never use compressed air to clean the connector - this can damage the microphone or speaker. Also avoid metal objects: they scratch the contacts and can close the board.

4. Software restrictions in MIUI: hidden charging settings

Xiaomi is actively implementing smart charging features that can artificially slow things down. For example, MIUI 14+ has an optimised charging option that limits current to 80% to extend battery life, but sometimes these algorithms fail.

Where to look for settings:

• 🔄 Settings → Battery → Battery settings → Optimized charging – turn it off if the phone is charging too slowly.
• ⚡ Settings → Battery → Performance mode – choose High Performance (increases charging speed but reduces battery life).
• 📊 Some firmware has a hidden menu ##284## that shows the current charging current. 1.5A plug-in 33W block, software problem.

Another common problem is that the power controller malfunctions after the MIUI update. If the slow charging started right after the update, try:

Remove the firmware to the previous version|Reset the settings to factory (without deleting data)|Clear the cache in Settings → Memory. → Cleanup|Disable all background processes in Settings → Annexes → Auto-start-->

5. Phone overheating: why charging slows at high heat

Lithium polymer batteries are extremely sensitive to temperature, and if the Xiaomi case heats up above 40°C, the power controller automatically reduces the charging current to avoid battery damage, which can occur even under normal conditions:

• 🌞 Charging in the sun or in a hot room.
• 🎮 Games or video rendering while charging.
• 🔥 Use of a case with poor heat transfer (especially silicone).
• 🚗 Charging in the car through a lighter (voltage in the on-board network is often unstable).

How to check the temperature:

1. Install the AIDA64 or CPU Monitor app.
2. Connect the charger and watch the battery temperature chart, and if it's above 45°C, that's a critical value.
3. Try charging your phone in aeromode (disables communication modules, reducing heating).

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If the battery temperature exceeds 50°C, immediately turn off the charge! further use can cause the battery to bloat or even catch fire.

6. Hardware malfunctions: when without service can not do

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

• 🔧 The power controller is in charge of power distribution, and when it breaks, the phone can charge with jerks or not charge at all.
• 🔌 Damaged charging boards – often fail after falls or moisture.
• 🔋 Bloated battery – if the phone case “inflated”, and the screen began to move away from the frame, the battery needs to be replaced urgently.
• 📶 Problems with the antenna module are rare, but it happens that the module malfunction 5G/4G It affects charging (especially Xiaomi). 13 Ultra).

How to diagnose a hardware malfunction:

1. Connect your phone to your PC via USB-C. If it is not detected or permanently disconnected, the problem is the connector or board.
2. Try charging your phone when it's off, and if you're up, it's the software or the background.
3. Light the flashlight on the battery (if the body is removable), and the swelling is noticeable even without disassembly.

⚠️ Warning: If the phone stopped charging after falling or getting moisture, don't try to turn it on! A short circuit can disable the motherboard.

External factors: sockets, extension cords and power bank

Sometimes the problem isn't the phone, it's the power source, and this can affect the charging speed.

• 🔌 Old wiring or faulty socket – may not provide stable voltage 220V.
• ⚡ Extension and tee-ups – many cheap models are not designed for high currents.
• 🔋 Power Bank is of poor quality – especially the Chinese no-name models of 10,000 mAh, which are issued only by the Chinese. 5W instead of the stated 18W.
• 🚗 Car charging - in the on-board network voltage varies from 12V before 14.4V, What can knock down the smartphone power controller.

How to check the power source:

1. Connect the charger to another outlet (preferably without an extension cord).
2. Try charging your phone from another power bank (like the original Xiaomi Mi Power Bank 3).
3. If you charge in a car, use a voltage stabilizer adapter (e.g. Baseus Car Charger).

FAQ: Frequent questions about Xiaomi's slow charging