Why Xiaomi Phone Gets Heated When Charging: Normal or Problem?

You hooked up Xiaomi to charge, and 10 minutes later, it got hot like it was just taken out of the microwave? Don't panic -- 80 percent of the time, it's normal, because of the physics of lithium-ion batteries. But what if the heat comes with slow charging, sudden shutdowns, or the smell of burning?

In this article, we will discuss 7 main reasons for overheating of Xiaomi, Redmi and smartphones. POCO During charging, from harmless (for example, using fast charging in the heat) to critical (battery bloating or damage to the power controller). You'll learn how to diagnose a problem by indirect signs, what measures will help lower the temperature, and in which cases you need to urgently carry the phone to the service — FAQ Answers to frequent questions and a charger compatibility table.

1.Fast charging: why Xiaomi is warming up stronger than usual

Quick Charge, Fast Charge or HyperCharge (in Xiaomi 12T Pro, Redmi Note 12 Pro+) can charge the battery by 50% in 15-20 minutes, but the speed has to pay for increased heat. When fast charging, the battery passes a current of 3-6 A (versus 1-2 A at standard), which heats it up to 40-45 ° C, which is the norm if the temperature does not rise higher.

The manufacturer puts this heating into the design: Xiaomi flagships use multi-layer graphite heat sinks and cooling systems with steam chambers (for example, in Xiaomi 13 Ultra). However, in budget models (Redmi 10A, POCO M5) cooling is simplified, so they warm up more. If your phone supports fast charging, but you take your time, you can turn it off manually:

• 🔋 Go to Settings. → Battery and productivity → Fast charging.
• ⚡ Turn off the option (in some firmware it is called Turbo Charging or Boost Charge).
• 🌡️ After that, the body temperature will decrease by 5-10°C, but the charging time will increase by 1.5-2 times.

Important: If the phone warms even when fast charging is turned off, the problem lies deeper – read the following sections.

Non-original chargers: risks and consequences

Using cheap Chinese charging or cables without certification is one of the main causes of overheating, and such devices often do not meet USB-IF standards and can:

• 🔌 Provide unstable voltage (for example, 5.2V instead 5.0V), What makes the smartphone power controller work at the limit.
• 🔥 Transmit overcurrents exceeding the allowable 2.4-3.0 A for your model.
• ⚡ Do not support Quick Charge or Power Delivery protocols, which makes the phone “think” that charging is weak, and tries to compensate for this by increasing current.

How to check the compatibility of the charger? Take a look at the label: the original Xiaomi charges are marked MDY-12-XX (where XX is the model digits) and support the QC 3.0/4.0 or PD 3.0 protocols. If your charging is nameless or with the inscription “For Samsung”, its use is fraught with not only overheating, but also battery damage.

⚠️ Warning: If, after connecting the unoriginal charge, the phone begins to vibrate or reboot itself, immediately turn it off.

3.Overheating due to high load during charging

Many users do not turn off their phone while charging, continuing:

• 🎮 Genshin Impact (Call of Duty Mobile).
• 📹 Videotape in 4K stream.
• 🔄 Update your application or system through the Play Market.

In this case, the processor (Snapdragon or Mediatek) and the battery run at the limit, which leads to cumulative heating. For example, in the Xiaomi 12T tests, when charging and playing simultaneously, the temperature reached 52 ° C, which is a critical threshold after which battery degradation begins (capacity loss of 1-2% per cycle).

How do you avoid overheating?

Don't play games while charging | Turn off background apps (especially social media) |Remove the case if it blocks the ventilation | Charge the phone in the shade (not in the sun) |Use Battery Savings mode-->

Tip: If you need to charge your phone and use it, turn on Airplane Mode or Saving Charge in the settings, which will reduce the load on the processor by 30-40%.

4. Battery bloating or wear: when it's time to go to service

If your Xiaomi is warming up when charging even when it’s off, and you’ve noticed:

• 📏 Bloating of the body (screen or back cover raised).
• ⚡ Rapid charge drop (from 100% to 1% in 2-3 hours).
• 🔋 Error "Battery damaged" in the settings.

Lithium-ion batteries are designed for 500-800 charging cycles, after which their capacity drops by 20-30%, and internal resistance increases, causing overheating.

How to check the status of the battery?

1. Enter the code in the phone app: ##4636##
2. Go to the section Information about the battery.
3. Check the wear level (if it is above 15%, it is time to change the battery).

⚠️ Warning: If the battery is swelling, don't try to puncture or bend it! This can cause a fire or explosion.Take your phone to Xiaomi's service center - the battery replacement will be done in 1-2 hours (cost: 1,500-3000). ₽ model-wise).

5. Software failures: viruses, updates and background processes

Sometimes the cause of overheating are software errors:

• 🦠 Viruses or mining bots that secretly use the resources of the phone.
• 🔄 Failed update MIUI, power-driver conflict.
• 📱 Application malfunctions (for example, Facebook or TikTok can “hang” in the background and load the processor).

How do you diagnose the problem?

1. Open Settings → Applications → Working and check which programs consume >10% of the CPU.
2. Run an antivirus (such as Dr.Web Light or built-in Security in MIUI).
3. Try charging your phone in Safe Mode (press the power button → hold off “Stop” → select “Safe Mode”). If the heating goes away, it’s the software’s fault.

If the problem has occurred after the MIUI update, try:

• 🔄 Reverse to the previous version through Settings → The phone. → Updating the system → Three points. → Select a Service Package.
• 📲 Reset the settings to factory (Settings) → Additionally. → Recovery and discharge).

💡

Before reset, save data! Use Mi Cloud or Google Photos to back up contacts and media files.

External factors: heat, humidity and mechanical damage

The ambient temperature directly affects the heating of the phone. Xiaomi manufacturer recommends charging devices at temperatures between 10 °C and 35 °C. If you leave the phone:

• 🌞 In the sun (for example, on a torpedo in a car in the summer).
• 🔥 Near the heater or battery.
• 💦 In a high-humidity bathroom.

In hot conditions (>35°C), the power controller automatically reduces the charging current, but if the cooling system is clogged with dust or damaged, the temperature can exceed 50°C.

What do I do?

• 🏠 Charge your phone in a cool, well-ventilated place.
• 🧊 If the phone is already overheated, disconnect it from the network and put it in the shade for 15-20 minutes.
• 🚫 Do not use a refrigerator or freezer for cooling – a sharp temperature drop will damage the battery!

Also check if the liquid has entered the USB-C connector. Oxidation of the contacts can cause short circuit and heating. If the phone falls or gets wet, clean the port with an alcohol tampon and dry it for 1-2 hours.

7. Power controller or USB-C connector malfunctions

If all previous causes are ruled out, but the phone is still warm, the problem may lie in:

• 🔌 Damaged connector USB-C (naked contacts, backlash).
• 🔧 Faulty power controller (microchip) PMIC, power-distribution).
• 🔋 Short circuit on the motherboard (often after falls or moisture hits).

How to recognize a hardware malfunction?

• The phone is not charged or charged with jerks (current jumps from 0.1A to 2.0A).
• When connecting the charging, the smell of burning or smoke appears.
• The USB-C connector is shattered or the contacts are blackened.

In this case, self-repair is not possible - you need a diagnosis in the service center.

• Replacement of the connector USB-C: 1 000–2 500 ₽.
• Repair of the power controller: 3000–6000 ₽.
• Replacement of motherboard: 8,000–15,000 ₽ (often).

⚠️ Warning: If the phone doesn't turn on after overheating or shows a "No Command" error, don't try to charge it! this could be a sign of Bootloader damage or a short circuit on the board.

💡

If the phone is warm when charging and does not hold a charge (discharges in 1-2 hours), in 90% of cases the battery or power controller is to blame.

FAQ: Frequent questions about Xiaomi heating when charging