If your Xiaomi smartphone is heated like an iron even with minimal load, it’s not always a sign of breakdown. Overheating is a common problem with Qualcomm Snapdragon and Mediatek Helio devices, but in 80% of cases it can be eliminated without a service center. In this article, we will analyze the physical and software causes of heating, separately focus on the Redmi Note 12, POCO X5 and Mi 11 models, and give a checklist of actions for diagnosis.
The rule is that the normal temperature of the case when used actively is up to 40-45 ° C (measured through applications like AIDA64). If the smartphone is heated to 50 ° C + in plain or 60 ° C + in games, this is a reason to sound the alarm. Especially dangerous for the battery: at 45 ° C +, accelerated battery degradation begins, and at 60 ° C, swelling or even fire is possible (although Xiaomi has protection against this).
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1. CPU and GPU: Why Xiaomi is warming up in games and video shooting
The main source of heat in the smartphone is a chipset (processor). + Xiaomi models on Snapdragon 8 Gen 1/2 (Mi 12, Redmi K50) Dimensity 9000 (POCO F5) They're the ones that are the hottest because of the architecture: these chips are optimized for performance, not energy efficiency, AR-(a) the temperature may reach 55–60°C is the norm for flagships, but not for budget devices.
Critical scenarios of processor overheating:
- 🎮 Games at maximum settings (Genshin Impact, Call of Duty Mobile) - the chip runs at 100% power, and the cooling system does not have time to remove heat.
- 📹 Video recording in 4K/60fps — Simultaneously load the processor, graphics accelerator and camera module.
- 🔄 Background optimization MIUI — After updating the system or installing heavy applications (Facebook, TikTok), the processor can warm up to 48°C to the plain.
How do you check the load on the processor? Install a CPU Monitor or AIDA64 and watch the kernel load. If more than 4 cores are loaded at 80%+ for no apparent reason, malware or a malfunction is running in the system.
2. Battery: When Xiaomi's Heating Is Associated with the Battery
If the smartphone is warming up even when it’s off or when connected to a charge, the problem is most likely the battery. Xiaomi uses lithium polymer batteries that are sensitive to:
- ⚡ Fast charging (especially) 120W+ Redmi Note 12 Pro+ — heat-up to 45°C is normal when charged, but if the temperature exceeds 50°C, it's a risk).
- 🔋 Battery wear – after 500 charging cycles (1.5-2 years of use), the capacity drops and internal resistance rises, leading to heating.
- 🌡️ Extreme temperatures - charging in the cold (-10°C) or under direct sunlight (+35°C) accelerates degradation.
How to check the status of the battery?
- Enter ##4636##, select Battery Information and view Health Level (should be >80%).
- Use the AccuBattery app to show the actual battery capacity and temperature in real time.
What to do if the battery is blown?
⚠️ Note: If Xiaomi is warming up while charging and slowly charging at the same time (for example, with a high-speed charger). 0% before 100% post 4+ This is a sign of a power controller or cable malfunction. Try another Quick Charge adapter. 3.0/4.0.
3. Programmatic causes: viruses, background processes and MIUI
MIUI is known for its “aggressive” background control, but sometimes it works against the user. For example, after upgrading to MIUI 14, many Redmi Note 11 owners complained of spontaneous heating due to a failure in the service miui.analytics (Xiaomi analytics).
Top.-3 programmatic causes of overheating:
| Reason. | Signs. | Decision |
|---|---|---|
| 🤖 Malware | Heating into simple, fast battery discharge, advertising in notifications | Scan Malwarebytes, remove suspicious applications |
| 🔄 Auto-update of applications | It warms at night or when connected to Wi-Fi | Disable Auto Update in Play Market → Settings |
| 📱 Failure MIUI | Lags, reboots, heating after update | Reset the settings to factory (Settings → About phone → Reset) |
How to find a "gluttonous" application?
- Go to Settings → Battery → Battery Use.
- See which apps are consuming >10% of their charge in the last 24 hours.
- Remove or limit background activity (Settings → Apps → Permissions → Autostart).
💡
If your smartphone is warming up after the MIUI update, try to roll back to the previous version via Fastboot. Instructions are on the 4PDA forum in your model's theme.
4. Problems with the cooling system: dust, thermal paste, radiator
Xiaomi uses three types of cooling:
- 🧊 Passive (graphite plates) - in budget models (Redmi) 10A, POCO M5).
- 💨 Active (heat tubes) + Copper radiator - in flagships (Mi 13, Black Shark 5).
- 🌊 Liquid (VC-cooling) - in gaming smartphones (POCO F4 GT).
If the cooling system is clogged with dust or the heat paste is dry, the heat sink gets worse.
The smartphone is not warmed evenly (one part of the body is hotter than the other).
After 10-15 minutes of play, performance drops (trottling).
In AIDA64, the temperature of the processor and battery differs by 15°C+ (normal – a difference of up to 10°C).
What do I do?
- Blow the connectors with compressed air (without disassembling the smartphone!).
- If the warranty is over - contact the service to replace the thermal paste (worth it). ~1500–2000 ₽).
- For gaming smartphones (Black Shark), buy an external cooler (such as Black Shark FunCooler Pro).
☑️ Diagnostics of the cooling system
5. Charging: Why Xiaomi gets hot when connected to the network
Fast charging is convenient, but the higher the power (W), the more heat.
Redmi Note 12 Pro+ (120W) warms up to 45-50°C when charging.
POCO X5 (33W) – up to 40–43°C
Mi 11 Lite (33W) - up to 38-40°C.
How to reduce heat during charging?
- 🔌 Use the original cable and adapter – cheap analogues warm themselves and heat the smartphone.
- ☀️ Do not charge in the sun or in a stuffy room.
- 📴 Turn it off. Wi-Fi/5G Close all applications while charging.
- 🔋 Enable Optimized Charging (Settings) → Battery – this will reduce the power to 18W, but it'll reduce heat.
⚠️ Note: If Xiaomi turns off when charging or shows an error "Charging suspended. Temperature too high," this is a sign of a power controller malfunction!
External factors: covers, sun, humidity
Sometimes the reason for the heating lies not in the smartphone, but in operating conditions:
- 🌞 Direct sunlight – even 10 minutes in the sun can heat the body up to 50°C. Xiaomi’s protection is triggered and the device shuts down at 65°C.
- 🧥 Dense cases – silicone or armored cases reduce heat sink by 20–30%, especially critical for passive-cooled models (Redmi). 9A).
- 💦 Humidity – if the smartphone has been in water (even briefly), oxidation of the contacts can cause short circuit and heating.
What do I do?
In the summer, keep your smartphone in the shade.
- Take off your case if you play heavy games.
If the smartphone is wet - do not turn it on, but take it to the service for drying.
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The optimal temperature for Xiaomi is from 0 ° C to 35 ° C. With prolonged use outside this range, the risk of failure increases by 3-5 times.
7. Hardware breakdowns: what to do if nothing helps
If you’ve tried all the tips, but Xiaomi is still warming up, the problem may be:
- 🔧 Faulty battery - bloating, short circuit.
- 🔌 Damaged motherboard – often after falls or moisture.
- 📡 Broken module. 5G/Wi-Fi — If the smartphone warms up when connecting to the network.
Signs of serious breakdown:
- Heat even when it's off.
The smartphone itself reboots at a temperature of > 40 ° C.
There was a chemical smell (a sign of burning components).
In such cases, do not try to repair yourself - contact the authorized Xiaomi service. the average cost of diagnosis is 500-1000 ₽, Replacement of the battery - 2000-4000 ₽, repair fee from 5000 ₽.