Why does Xiaomi phone warm up when charging – the norm or the danger?

You have connected Xiaomi Redmi Note 12 or POCO X5 Pro to charge, and 10 minutes later, the case became hot like a cup of tea? Overheating of the smartphone while charging is one of the most common complaints of brand users, but not always a cause for panic. In 60 percent of cases, heating is related to normal lithium-ion battery life, and in the other 40 percent, to operating errors or malfunctions».

Modern Xiaomi smartphones support fast charging (from the 33W before 210W In flagships, which inevitably leads to a rise in temperature, but if the phone heats up to 45.°C+ If you turn off from overheating, that's a warning sign. In this article, you'll find a checklist for diagnosis, a safe temperature table, and instructions on how to reduce heat without losing charging speed.

1. Normal heating vs. overheating: when to sound the alarm

Any smartphone gets hot when it's charging -- that's a physical law. Energy is converted to heat because of the resistance of conductors and the chemical reactions in the battery. But how do you tell the difference between natural heat and dangerous heat?

Xiaomi says the optimum temperature of the case when charging is 30-38°C. Exceeding to 40-42°C is permissible when:

• 🔋 Use of fast charging (67W/120W/210W).
• 🌡️ Hot environment (above 25)°C).
• 🎮 Simultaneous charging and intensive use (games, video editing).

Critical mark - 45°C and above. At that temperature:

• ⚠️ Battery degrades 2-3 times faster (capacity loss by 20-30% per year).
• 🛑 Emergency charging shutdown (on models with MIUI 14+).
• 🔥 Risk of battery bloating or even fire (extremely rare, but possible).

2. TOP-7 Reasons Why Xiaomi is Heated When Charging

Let's look at the specific causes of overheating, from the most innocuous to the most critical, and start with the ones that you can fix yourself.

🔌 Problems with charger or cable

Unoriginal or damaged accessories are the leading cause of overheating. Cheap cables have thin veins that overheat at high currents (for example, when high currents are used). 67W redmi charging K60). A low-quality power supply can produce unstable voltage, forcing the smartphone charging controller to work at its limit.

How to check:

1. Touch the charger and cable – if they are hot, the problem is with them.
2. Try charging your phone with the original Xiaomi kit.
3. Use the Ampere (Android) app to monitor charging current. 33W: 3.5–4.5A.

📱 Background processes and “heavy” applications

If you charge your phone and at the same time:

• 🎮 Play Genshin Impact or Call of Duty Mobile.
• 📹 You can mount the video in CapCut.
• 🔄 Updating the system or applications.

— The processor and the graphics accelerator are running at maximum, generating additional heat, in which case the temperature can rise to 42-45.°C, even if the battery and charging are in good condition.

💡

Close all applications before charging: swipe upwards twice and swipe the application cards, which will reduce the load on the processor by 20-30%.

🔋 Wear or damage to the battery

Lithium-ion batteries lose capacity and stability after 300-500 charging cycles. If your Xiaomi is over 2 years old, check the status of the battery:

1. Go to Settings → Battery → Battery status.
2. Use the AccuBattery app (showing real capacity and wear).

Signs of wear and tear:

• 🔋 Fast-setting (less than 4-5 hours with average load).
• 🌡️ It warms even with slow charging (5W/10W).
• 📉 Bloating (check if the phone is on the table).

📲 Software failures and viruses

Firmware errors MIUI or malware can make the processor run at full power even in standby mode, for example, mining bots or spyware applications load. CPU 80-100%, which leads to overheating.

How to check:

1. Open the Settings. → Annexes → Permits → Auto-Start and Disable Suspicious Programs.
2. Use Malwarebytes to scan for viruses.
3. Check the heating in safe mode (press the power button). → «Safe regime»).

🌡️ External factors: heat, sun, cover

The ambient temperature directly affects the heating of the phone, for example, if you charge. POCO F5 In the sun or in the car in the summer, the temperature can rise to 50°C in 15 minutes. Same goes for tight silicone or leather cases, which block heat transfer.

Recommendations:

• 🌞 Charge your phone in the shade at a temperature of 10–25°C.
• 🧥 Remove the case while charging.
• ❄️ Do not put the phone on soft surfaces (pillows, blankets) - they worsen heat exchange.

🔧 Failure of the charging controller

Controller (or PMIC) It regulates the voltage and current that goes into the battery, and if it's damaged, the phone can do it:

• 🔥 Overheating even when the screen is off.
• 🔋 Charge with jerks (fast, then slowly).
• 🛑 Turn off when charging is connected.

This malfunction can only be diagnosed in the service center using a tester. DC Power Supply.

⚡ Use of wireless charging

Xiaomi models with Qi-enabled charging (such as Xiaomi 13 Ultra or Mix Fold 3) warm up more when wireless charging than when wired, due to energy losses per induction (the efficiency of wireless charging is 60-70% versus 90% for wired).

Tip: If the phone is very warm on wireless charging, go to a wired or use a cooling stand.

💡

90% of charging overheating problems are solved by replacing the cable, closing background applications or updating the firmware, and only 10% of cases require repair.

3.How to check the temperature of Xiaomi: instructions

To find out exactly how warm your Xiaomi is, use built-in tools or third-party apps. Here is a step-by-step guide:

Method 1: Integrated monitoring (MIUI 12 and newer)

1. Open the Settings. → Battery.
2. Put it on the icon. ⚙️ (battery settings).
3. Select Battery Status → Temperature.

Normal readings:

• 🟢 25–35°C - optimal.
• 🟡 36–42°C - permissible under load.
• 🔴 43°C+ — criticality.

Method 2: Annex AIDA64

AIDA64 shows the temperature not only of the battery, but also of the processor, graphics accelerator, motherboard.

1. Download AIDA64 from Google Play.
2. Open the Sensors tab.
3. Note the lines: Battery temperature CPU

Method 3: Hidden engineering code (for advanced)

Dial in the phone application:

##4636##

Select Battery Information. This displays real-time temperature, charge level and health status.

Use the original cable and power supply

Close all background applications

Remove the cover and charge in a ventilated place

Check the temperature through AIDA64

Update MIUI last-minute-->

Table 4: Safe Temperatures for Xiaomi when Charging

Below is a table of acceptable temperatures for different scenarios.The data is based on official Xiaomi recommendations and lab tests. DXOMARK.

If your Xiaomi temperature is consistently above the above values, follow the instructions in the following section.

5. Step-by-step instruction: how to reduce heating when charging

Follow this algorithm to lower the temperature of your phone without losing functionality.

Step 1: Optimize charging

• 🔌 Use the original cable and power supply (the box should have the inscription Xiaomi or Mi).
• 🔋 Turn off Fast Charging in Settings if you don't rush: Settings → Battery → Battery settings → Turn off fast charging.
• ⚡ Don't charge your phone to 100%. Optimal range is 20 to 80%.

Step 2: Reduce the load on the processor

• 🎮 Close all games and heavy apps (TikTok, YouTube) 4K).
• 📱 Enable Power Saving Mode: Settings → Battery → Energy saving regime.
• 🔄 Turn off automatic app updates: Play Store → Settings → Auto-update of applications → Never.

Step 3: Control external conditions

• 🌡️ Charge your phone at a temperature of 10–25°C.
• 🧥 Remove the case (especially silicone or leather).
• 🪑 Put your phone on a hard surface (table, stand) rather than on a sofa or bed.

Step 4: Check the software

• 📲 Update. MIUI Up to the latest version: Settings → The phone. → Updating the system.
• 🛡️ Check your phone for viruses with Malwarebytes.
• 🔄 Reset to factory settings if heating started after the update: Settings → The phone. → Resetting settings.

💡

If the phone is warming up even when it's off when charging, it's a sign of a power controller or battery failure.

6.When to contact the service: 5 alarm signals

Some symptoms indicate hardware malfunctions that cannot be repaired on your own. Contact Xiaomi Service Center if:

⚠️ If the phone turns off when charging is connected or shows an error "No Charging supported", this may be a sign of a short circuit in the port. USB-C. Continued use is dangerous!

• 🔥 Phone heats up to 50°C+ 5-10 minutes of charging.
• 📉 The battery is swelling (the body is deformed, the screen “goes away»).
• ⚡ Charging is jerky or interrupted for no reason.
• 🛑 The phone spontaneously turns off when connected to the network.
• 💧 The screen displays a warning: “Battery temperature is too high” even under light load.

The cost of diagnostics in official Xiaomi services – from 500 ₽. Replacing the battery will cost 2,000 to 4,000 ₽ (Charging controller or port USB-C They cost 1,500 to 3,500. ₽.

Important: Don't go to informal workshops! Using unoriginal parts can lead to:

• 🔋 Rapid degradation of the new battery.
• 🛑 Loss of warranty (if phone warranty).
• 🔥 Fire hazard situation (when using low-quality batteries).

7. Myths about Xiaomi heating: what not to be afraid of

There are many myths on the Internet about overheating smartphones, and let's take a look at the most popular ones and explain why they don't match up.

Myth 1: “If your phone is warm, the battery will go bad.”

Heating to 40.°C in isolated cases will not harm the battery; constant high temperature becomes critical (for example, if you play games daily while charging); one episode of overheating will not reduce the battery life.

Myth 2: “You should always charge to 100%”

That's bad advice! Xiaomi's Li-ion batteries are designed to last 300-500 cycles when charging up to 100%. If you keep the charge in the range of 20-80%, the number of cycles will increase to 800-1000. Use the Optimized Charging feature in the battery settings.

Myth 3: “Wireless charging is safer than wired charging”

Conversely, wireless charging is less efficient (60-70% efficiency vs. 90% efficiency for wired charging) and warms the phone more. It is convenient, but not safer. For Xiaomi with Qi support (such as the Xiaomi 13 Pro), it is recommended to use cooling stands.

Myth 4: “If your phone is warm, put it in the refrigerator.”

It's dangerous! A sudden temperature drop can cause condensation inside the case, which will short circuit.

1. Turn it off the charger.
2. Place it on a flat surface in the shade.
3. Wait for cooling to 30-35°C.

Myth 5: “Everyone is warming up – that’s okay.”

No, if your Redmi Note 11 or POCO X4 Pro heated to 45°C+ When you charge normally, it's not normal. Compare it to other users on forums (e.g., the other users on the forums, 4PDA If the problem is massive, wait for the firmware update. If it's single, look for the malfunction.

FAQ: Frequent questions about Xiaomi heating when charging