Have you noticed that your Xiaomi gets hot like an iron when connected to a charger?It’s not just an unpleasant feeling – overheating while charging can signal serious problems with the battery, charger or even the internal components of the smartphone. In this article, we’ll break down 7 main reasons why Redmi, POCO or Mi heat up when charging, and give step-by-step recommendations on how to fix the problem without going to the service center.
It is important to understand that moderate heating (up to 35-40°C) is normal for lithium-ion batteries. But if the phone body becomes scorching hot (above 45°C), and charging is accompanied by a sharp drop in battery capacity, this is cause for concern.
1.Fast charging: why Xiaomi is warming up stronger than other smartphones
Xiaomi’s fast-charging technologies (such as HyperCharge 120W or TurboCharge 33W) can restore battery power in 15-30 minutes, but have the downside of increased heat generation. The higher the charger’s power, the more intensely both the battery and the processor control heat up.
Xiaomi 12 Pro, Redmi Note 11 Pro+ or POCO F4 GT models use a dual battery system that distributes the load between the two batteries.
- 🔥 Use a non-original cable or adapter
- 📱 The phone is actively used during charging (games, video)
- 🌡️ Charging occurs in a hot room (above 30)°C)
The manufacturer says that Mi-FC (Flash Charge) technology is safe, but only if operating conditions are met. If your Xiaomi supports ultra-fast charging, try temporarily turning it off in the battery settings and compare the temperature of the case.
2. Non-original accessories: the main cause of overheating
According to statistics from service centers, 68% of overheating cases during charging are associated with the use of poor-quality cables or adapters.
- 🔌 Provide unstable voltage (for example, 9V instead 5V)
- 📉 Having too high resistance, which leads to energy loss in the form of heat
- ⚡ Do not support fast charging protocols, causing the phone to “fight” for compatibility
How do you check the originality of the charger?
| Sign. | Original | Fake. |
|---|---|---|
| Marking | Clear, with the Mi/Redmi logo, indicating the model | Blurred, without a brand or with typos |
| Weight. | Heavy (quality materials are used) | Too light (empty body) |
| Price. | 800.₽ adapter 33W | Cheaper 400.₽ for" |
If you suspect that the problem is charging, try using another certified adapter (for example, from Anker or Baseus with PD/QC support). Also check the cable - often it becomes the "weak link" due to damaged veins.
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To quickly check the cable, connect it to another device, and if it's also warming, the cable is the problem.
Background processes and “heavy” applications
Many users don’t close games or resource-intensive apps (TikTok, YouTube, Genshin Impact) before putting the phone on charge, resulting in the processor and graphics chip continuing to run at high frequencies, and the battery is simultaneously charged and discharged, resulting in double heat generation.
How to check which apps are warming your phone:
- Open Settings → Battery → Battery use
- Take a look at the consumption chart over the past 6-12 hours
- Pay attention to the apps marked "High consumption"
Typical overheating "culprits":
- 🎮 Games: PUBG Mobile, Call of Duty, Genshin Impact
- 📹 Video applications: CapCut, KineMaster, YouTube Studio
- 🔍 Background processes: MIUI Optimization, Google Play Services
The solution is simple: close all unnecessary applications through Recent Tasks before charging, or use Power Saving mode in battery settings. You can also temporarily disable automatic application updates in Settings → Applications → Auto Update.
How to forcefully close the "hung" application?
4.Battery problems: when it's time to go to service
If your Xiaomi is warming up when charging even with the original adapter and without load, the problem may lie in a degraded battery. Lithium-ion batteries lose capacity after 300-500 charging cycles, and their internal resistance increases, which leads to:
- 🔋 Battery bloating (visually visible on the swollen back cover)
- ⚡ Quick discharge (c) 100% before 0% post 2-3 hour)
- 🌡️ Overheating even with small currents of charging
How to check the status of the battery:
- Enter the code ##4636## in the phone application
- Select the item Information about the battery
- Pay attention to the parameters Charge level, condition and temperature
Critical indicators for which battery replacement is necessary:
| Parameter | Norma. | Critical significance |
|---|---|---|
| Temperature in plain | 25-35°C | Above 40°C. |
| Battery operating time | 1.5-2 days (at average load) | Less than 6 hours |
| Bloating of the hull | No deformation. | Clearance between screen and body >1 mm |
⚠️ Warning: If the battery is swelling, you can't keep using the phone, it could cause fire. Turn off the device immediately and go to the service center!
5. Software failures: when firmware is to blame
Sometimes, firmware errors are the cause of overheating, especially after the MIUI update. For example, MIUI 13.0.4 and MIUI 14.0.2 have been reported to have power management bugs that have caused the processor to run at maximum frequency even in standby mode.
Signs of software failure:
- 📱 The phone is warmed even on the screensaver (without active applications)
- 🔄 The charge is interrupted, then resumed.
- 📉 The battery is discharged faster than usual.
How to fix the problem:
- Check for updates in Settings → About Phone → System Update
- Reset the battery settings: Settings → Battery → Reset battery statistics
- Perform a reset to factory settings (pre-save data!)
If the problem has occurred after the update, you can try to roll back to the previous version of MIUI via Fastboot or Mi Flash Tool.
Save Contacts in Google Account
Copy photos and videos on PC
Write down passwords from Wi-Fi and apps
Make sure the charge level is >50%
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6 External factors: why even a serviceable phone warms
Even a fully serviceable Xiaomi can overheat when charging due to external conditions.
- 🌞 Direct sunlight (body temperature can rise to 50)°C)
- 🚗 Charging in the car (especially on the dashboard in summer)
- 🛏️ Using the phone under a blanket or on a soft surface (vents closed)
- 🔥 Ambient temperature above 35°C
The manufacturer recommends charging smartphones at a temperature of 10 ° C to 35 ° C. If this range is exceeded, the system automatically reduces the charging current, but this does not always save from overheating.
What to do:
- 🍃 Charge your phone in a ventilated place
- ☀️ Avoid direct sunlight (even through a window)
- 🚫 Do not put your phone on a carpet, sofa or other soft surfaces
- 📴 Remove the cover if it fits tightly and has no vents.
⚠️ Warning: If you charge your phone in your car, never leave it on a torpedo in the sun.Indoor temperatures can reach 70 in summer°C, resulting in irreversible battery damage and risk of fire.
7 Hardware malfunctions: when repairs are not necessary
If all of the above methods did not work, the problem may be a hardware breakdown, most often overheating when charging causes:
- 🔌 Faulty Power Controller (manages charging process)
- 📶 Damaged connector USB-C (oxidation, pollution, mechanical damage)
- 🔋 Short circuit in the food chain
- 🛠️ Damage to the motherboard (for example, after falling or getting moisture)
Diagnosing a hardware fault on your own is difficult, but there are several signs:
- The phone warms up even when it is off.
- Charging is interrupted or does not go at all
- There is a smell of burning or melted plastic
- Artifacts appear on the screen or the phone spontaneously reboots
In such cases, it is not recommended to continue using the device - this can lead to a complete failure or even a fire.
| Type of repair | Cost (₽) | Date(days) |
|---|---|---|
| Replacement of the power controller | 2 500 — 4 000 | 1-2 |
| Repair of the USB-C connector | 1 500 — 3 000 | 1 |
| Diagnosis of the motherboard | 1 000 — 2 000 | 1-3 |
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If the phone is warming up and not charging (or charging is jerky), there is a 90% chance that the USB-C connector or power controller is a problem.