Why Xiaomi phone is slowly charging from the network: a full analysis of the causes and solutions

You plugged in a Xiaomi Redmi Note 12 or POCO X5 Pro to charge, but an hour later, the screen still has the same 20% — and the time to fully charge is displayed as 5+ hours? Slow charging from the network is one of the most common problems for owners of Xiaomi smartphones, and there may be more than a dozen reasons for it. In this article, we will not just list possible malfunctions, but teach you to diagnose the problem by symptoms, test components and fix defects without going to the service center.

It is important to understand: if before the phone charged in 1.5 hours, and now spends on it 4 hours+ It's not always about the battery, but it's about the firmware. MIUI, feed-in, USB-We've collected all the possible scenarios, from the banal (mud in the connector) to the exotic (fast charging conflict), and we've added tests to test each element of the circuit on its own.

Let’s warn you right away: if your Xiaomi is charging slowly just from wireless charging, the problem lies in another – read our separate article on this topic. Here we focus exclusively on wired charging from the 220V network.

1. Checking the power supply and cable: why 5B instead of 9B?

The first thing you need to do is measure the actual voltage and current that is coming to the phone, and the fact is that many users use non-original chargers that give out 5V/1A instead of the declared 9V/2A or 12V/3A. Even if the case of the unit says "Quick Charge 3.0", this does not guarantee real support for fast charging.

How to check:

• 🔌 Connect your phone to charge and open the Ampere app (available on Google Play).It will show current Volts (V) and Amperes (A).
• 📊 Compare the numbers to your Xiaomi passport details (see table below). 13 Pro should be accepted 10V/6.5And fast-charging.
• ⚡ Change the cable: even the original power supply will not give full power if the cable is damaged or does not support high currents.

⚠️ Note: If the Ampere app shows 0.1A-0.5A when connected to the network, it means that the phone does not recognize the charger as compatible.

Dirt and oxidation in USB-Port: How to Clean Without Damage

One of the most common causes of slow charging is a contaminated or oxidized USB-Type C port, and the dust, the pile of your pockets, the moisture, all build up inside the connector and make contact worse, and the phone can periodically shut down or be charged with jerks.

How to check:

• 🔦 Light a flashlight to the port: if you see debris or green plaque (oxidation), it must be removed.
• 🧲 Clean the port carefully with a toothpick with cotton wool dipped in alcohol!
• 🔄 After cleaning, restart your phone – sometimes the system doesn’t immediately recognize the improved contact.

Signs of a polluted port:

• 📉 Charging is only in a certain position of the cable.
• ⚡ The phone is charged, then not (intermittent process).
• 🔌 When connecting to the PC, a notification “Charging through” appears USB slower".

⚠️ Warning: If the port is still out of order after cleaning, the contacts inside the connector may have bent. USB-service-module.

3. MIUI settings that inhibit charging

MIUI has several hidden features that can artificially limit charging speeds, such as Optimized Charging (called Battery Protection in some firmware) slows the process after 80% to extend battery life, but sometimes another setting, Power Saving When Charging, can also work.

How to disable restrictions:

1. Go to Settings → Battery and Performance → Battery Settings
2. Turn off the option "Optimized Charging" (if it is active).
3. In the "Advanced" section, check if the "Energy Saving mode when connecting to charging" mode is turned on.
4. Restart your phone – sometimes changes only apply after a reboot.

Another possible reason is background processes that consume energy faster than it gets, to test this.

1. Connect the phone to the charger.
2. Open Settings → Applications → Battery status.
3. See which programs consume the most power in the background (e.g. Facebook, Telegram, Google Play Services).
4. Limit their activity through Settings → Apps → Permissions → Autostart.

4. Battery problems: how to determine wear

If your Xiaomi is over 2-3 years old, chances are high that the battery has lost capacity and can no longer take charge at full speed.

• 📉 The phone is discharged in 3-4 hours with moderate use.
• ⚡ Charging is jerky: it quickly gains interest, then stops.
• 🔥 The body heats up more than usual during charging.
• 🛑 The phone turns off at 15-20% charge, although it used to work to 0%.

How to check the status of the battery:

1. Enter the code ##4636## in the phone application.
2. Go to the section Information about the battery.
3. Compare the parameter Wear Level (if any) or Capacity with passport data.

For more accurate diagnosis, use the AccuBattery app (available on Google Play) to show:

• 📊 Real battery capacity (e.g. 3,500 mAh instead of the claimed 5,000 mAh).
• 📉 Discharge schedule and rate of degradation.
• ⚡ Current charging speed in mA.

⚠️ Note: If the AccuBattery is less than 60% of the original capacity, the battery must be replaced.

5.Fast Charging Conflict: Why the Phone Is "Failing" From 33W

Some Xiaomi models (especially the Redmi Note 10/11 and POCO X3) suffer from a bug where the system misidentifies compatibility with fast charging.As a result, the phone charges at reduced power (5V/1A instead of 9V/2A), although the power supply and cable support high currents.

How to fix it:

• 🔄 Reboot your phone with a connected charge – sometimes it resets the definition error.
• 📱 Turn on Developer Mode (7 times click on Version) MIUI in the phone settings), then activate the option "Debugging by USB".
• 🔧 Connect the phone to the PC and enter into ADB Adb shell settings put global charging_slow_switch 0 This forcibly disables the restriction on slow charging.

💡

If your phone starts charging more slowly after the MIUI update, try rolling back to the previous firmware version. Sometimes charging bugs appear in new builds and are fixed only after a few updates.

Another option is to reset the battery settings:

1. Go to Settings → Memory → Cleanup.
2. Select "Battery Cleanup" (in some firmwares this item is called "Battery Calibration").
3. Connect the phone to charge and wait 100%, then turn it off and discharge to 0%. Repeat the cycle 2-3 times.

6. Software failures: When MIUI firmware is to blame

If all the hardware components (cable, power supply, port) are fine, but Xiaomi still charges slowly, the problem may lie in the firmware, especially after MIUI updates, when new versions contain power management bugs.

Signs of software failure:

• 📱 The phone charges quickly only when it is off.
• ⚡ Charging speed drops after 50-60%.
• 🔄 Reboot temporarily solves the problem, but after a while everything repeats.

How to fix it:

1. Reset the settings to factory (don’t forget to make a backup!): Settings → About phone → Reset settings.
2. If the reset does not help, search the phone through the Mi Flash Tool (instructions on the official website of Xiaomi).
3. Check if custom cores or modified firmware (such as Pixel Experience) are installed that may conflict with the original software.

💡

If slow charging appears immediately after the MIUI update, try rolling back on the previous version or wait for a patch from Xiaomi.

For advanced users:

• 🛠️ Check the system logs for charging errors: adb logcat | grep -i "charging"
• 📊 Install the Magisk module "Fast Charge Enabler" (root rights required).

External factors: temperature, humidity, network interference

Few people know, but the environment has a big impact on charging speed.

• 🌡️ Temperatures below 10°C or higher than 40°Xiaomi C automatically reduces charging current to protect the battery.
• 💦 High humidity (for example, after rain) can cause contact oxidation in the port.
• ⚡ Unstable voltage in the network (jumps 220V) leads to failures in the power supply.

How to minimize the impact of external factors:

• 🏠 Charge your phone in a room with a temperature of 15-30°C.
• 🔌 Use a network filter or UPS if your network has frequent power surges.
• 🚫 Do not charge Xiaomi in the bathroom or kitchen (high humidity).

8. When is the time to bring the phone to the service?

If you’ve tried all the ways, but Xiaomi still charges for 4+ hours, it’s probably a hardware problem.

• 🔌 Port port USB shattered or has visible contact damage.
• 🔥 The phone is very hot in the processor area even with a small load.
• 🛑 The battery swelled (see on the raised screen or body).
• ⚡ When connected to charging, the phone does not respond or writes “Charging is not supported".

Cost of repair in official Xiaomi services (2026):

⚠️ Warning: If you notice that the battery is swelling, immediately disconnect the phone from charging and do not use it - this can lead to fire.

FAQ: Frequent questions about Xiaomi's slow charging