Slow charging on Xiaomi phone: what it means and how to fix the problem

You plugged Xiaomi into charging, but battery percentages crawl like a snail, and instead of the promised “50% in 30 minutes” you get a barely noticeable increase? Slow charging is one of the most common complaints of users of Redmi, POCO and Mi smartphones, and the problem can occur on both new models (Xiaomi 14 Ultra) and budget devices (Redmi Note 12). 80% of cases are to blame for problems that can be fixed on their own without going to the service center.

In this article, we will analyze all possible causes of slow charging - from banal wear of the cable to hidden firmware settings. MIUI, You'll learn how to diagnose a problem in 5 minutes, what tests to do, and what to do if the phone is charging at 2 percent per hour. MIUI against the background of high battery temperature - this is the most underestimated reason, which is silent even in official instructions.

1.How do you know if the charging is really slow?

Before you panic, check if your Xiaomi’s charging speed matches the claimed specs.The manufacturer always specifies charging power in the technical specifications (e.g., Xiaomi 13 Pro supports 120W, and Redmi 10C only 18W).If your phone charges longer than the official data, there is a problem.

How to measure the real speed:

• 📱 Built-in monitoring: Go to Settings → Battery → Battery status. This shows the current charging power (in watts). Compare it to the maximum for your model.
• ⚡ Analyzer applications: Install AccuBattery (Android) or AIDA64, and they show current (in mA) and voltage (in volts). Multiply current by voltage, and you get real power.
• ⏱️ Manual test: Set charging time from 20% to 80%. For Xiaomi with Fast Charge support, the norm is 30-40 minutes. If the process takes 1.5+hours, that's an anomaly.

It is important to consider the test conditions:

• 🔌 Use the original power supply and cable (especially for models with Quick Charge 4+ or HyperCharge).
• 🌡️ The battery temperature should be in the range of 15-35 °C. When overheated, MIUI automatically reduces power.
• 📴 Turn off all background processes (games, navigation, video) – they eat up to 30% of the charging power.

2 Top-5 Hardware Causes of Slow Charging

If tests show that the charging power is below normal, first check the physical components. In 60% of cases, the problem lies in wear or damage to the hardware.

⚠️ Warning: If when you connect a charger, the phone says, "This charger is not supported," but you're using the original charger, that's a sign of damage to the power controller. Continued use could lead to fire hazard!

How to quickly check the cable and power supply:

Try another cable (preferably from the set)

Connect the power supply to another device (tablet, powerbank)

Check if the indicator on the power supply is lit when connected to the socket

Check the cable for inflections and meltings

Measure the output voltage of the block with a multimeter (should be 5V/9V/12V model-wise)-->

3. MIUI software limitations: hidden settings that slow charging

MIUI has several built-in features that deliberately reduce charging speeds, ostensibly to extend battery life, which are often activated by default and users are unaware of their existence.

Where to look for restrictions:

1. Settings → Battery → Battery settings → Optimized charging If the function is on, the phone will charge up to 80%, then “get” up to 100% before disconnecting from the network.
2. Settings → Battery → Battery condition → Temperature control At a battery temperature above 40 ° C, MIUI automatically reduces power to 5-10W.
3. Settings → Additional → Special features → Fast charging On some models (POCO X3, Redmi Note 11) this option is disabled by default.

Another common problem is background processes that steal power, such as when you're charging with navigation (Google Maps or Yandex.Maps), you can drop 30 to 40 percent.

• 🎮 Games (Genshin Impact, PUBG Mobile)
• 📹 Video recordings in 4K
• 🔄 Synchronization of cloud services (Google Photos, Mi Cloud)

💡

If the phone gets very hot during charging, turn on the aircraft mode - this will speed up the process by 20-25% by turning off communication modules (5G, Wi-Fi, Bluetooth).

4.Battery Temperature: Why Xiaomi "strangles" charging when heated

MIUI aggressively limits charging at a battery temperature above 38°C — even if you use the original 120W power supply. This is done for safety, but often works falsely. For example, if the phone is lying in the sun or near a heat source, the system can reduce power to 3-5W, even though the battery is not actually overheated.

How to check the temperature:

1. Install the AIDA64 app and open the Sensors section.
2. See Temperature: Battery. Normal is 25-35°C.
3. If the temperature is above 40°C, MIUI will force charging to "sparing mode".

How to cool your phone before charging:

• ❄️ Remove the case (especially if it is thick or silicone).
• 📵 Turn off mobile data and Wi-Fi for 10-15 minutes.
• 🌬️ Blow on the back with a fan or put the phone next to the air conditioner.
• 🛌 Do not place the device on soft surfaces (cushions, blankets) - this blocks ventilation.

⚠️ Warning: If the battery temperature exceeds 45°C at rest (no charge or load), this is a sign of critical battery wear. Stop using your phone immediately and contact the service!

5.Firmware and Updates: How MIUI slows charging after updates

After the MIUI update, many users notice that the charging speed drops by 30-50%.

• 🐞 Bugami in newer firmware versions (e.g., MIUI 14.0.3 had a problem with the power controller on Xiaomi 12T).
• 🔒 New restrictions (in MIUI 15 added "smart temperature control" that reduces power too aggressively.
• 📥 Background updates of applications (after the update of the Google Play system and the Mi App Store begin to massively update the software, eating resources).

How to return to normal speed:

1. Firmware rollback (if the problem has appeared after the update): Settings → About Phone → System Update → Three Points (menu) → Select the Service Pack → Select the old version of MIUI Attention: A rollback is only possible within 7 days after the update.
2. Reset battery settings: Settings → Battery → Three dots (menu) → Reset battery settings
3. Cleaning the system cache: Settings → Memory → Clean the cache

If the problem persists, check the system logs for errors in the power controller.

1. Enable Developer Mode (Settings → About Phone → MIUI version – press 7 times).
2. Go to Settings → Additional → For developers → Logic Errors.
3. Connect your phone to your PC and view logs through ADB (look for lines with battery, charger, thermal).

💡

If your phone is charging slowly after the MIUI update, try resetting the battery settings and clearing the cache first, which solves the problem 70% of the time without rolling back the firmware.

6. Battery: wear, calibration and myths about "overclocking" charging

Xiaomi's average battery life is 2-3 years (or 500-800 charge cycles), after which the capacity drops by 20-30%, and the charging speed decreases due to increased internal drag. You can check the wear and tear at AccuBattery (Health section). If the rate is below 80%, it's time to change the battery.

What else affects speed:

• 🔋 Incorrect calibration: If the phone suddenly turns off at 20 to 30 percent charge, the battery controller is lying to the system about the actual capacity, which can slow down charging.
• 🔄 Frequent microcycles: Connecting a 5-10 minute charge (e.g. from powerbank) wears out the battery faster than a full 0-100% cycle.
• 🌡️ Cold or heat storage: If the phone has been lying for a long time at temperatures below 0°C or above 40°C, the battery chemistry is disrupted.

How to calibrate the battery (works only at physical wear and tear of no more than 15%):

1. Discharge your phone to 0% (until it turns off on its own).
2. Connect to the original charger and charge for at least 8 hours (even if the indicator shows 100%).
3. Turn off charging, turn off the phone for 5 minutes, then turn on and check the capacity in AccuBattery.

⚠️ Warning: Attempts to “overclock” charging via an engineering menu (#4636##) or modified firmware (Custom ROM) can cause the battery to bloat or the power controller to burn out. Xiaomi officially prohibits such manipulations – they are no warranty!

7 Wireless charging: why Xiaomi charges slower than cable

Xiaomi models with wireless charging support (Xiaomi 13 Pro, Mix 4, POCO F4 GT) often face the fact that the speed on Qi is 2-3 times lower than on cable.

Speed comparison (for Xiaomi 13 Pro):

How to speed up wireless charging:

• 🔌 Use the original Xiaomi Wireless Charger station (e.g., the MDY-12-ES model for 50W).
• 📍 Center your phone on the charging pad – a 5mm shift reduces power by 20%.
• ☀️ Avoid direct sunlight — heating above 30°C causes the system to reduce power.
• 🛌 Remove the case (especially metal or magnets).

If wireless charging is extremely slow (power below 5W), check:

• 🔋 Battery state (the worn-out battery does not take Qi charge well).
• 📶 Interference (metal objects nearby, other wireless devices)
• 🔄 Charging station firmware (update via the Mi Home app if it's a smart device).

FAQ: Frequent questions about Xiaomi's slow charging