Have you noticed that Xiaomi’s charger gets hot when charging a smartphone? This phenomenon is familiar to many owners of the brand’s devices, from the budget Redmi to the flagship Mi 13 or POCO F5. But should you worry when the power supply gets hot, or is it normal for the hardware to work?
In this article, we will discuss the 7 main causes of overheating of Xiaomi chargers, including features of fast charging, poor-quality cables and battery problems. You will learn what temperatures are considered acceptable, and when heating signals a malfunction, and we will also give step-by-step instructions on how to check the charger and phone to avoid breakages or even fire.
Spoiler: 80% of the time, overheating is not dangerous, but there are 3 critical signs that you need to stop charging and replace accessories.
1.Fast charging is the main cause of heating
The main factor why Xiaomi charging is heated is the use of fast charging technologies (Quick Charge, Turbo Charge, HyperCharge). The higher the power (watts), the more intensely both the power supply and the smartphone itself heat up.
For example, Xiaomi 33W, 67W or 120W chargers (like the Mi 11 Ultra) convert large amounts of energy in a short time, and by the laws of physics, some of that energy is dissipated as heat, and the normal temperature for such units is up to 50–60°C on the surface.
- 🔥 33W–67W: heat-up to 45-55°C (warm but not scorching)
- ⚡ 80W–120W: heat-up to 60-70°C (hot but tolerant)
- ❄️ 5W–18W: barely noticeable heat (30–40)°C)
If your charger matches the power specified on the case and does not exceed the specified temperatures, there is nothing to worry about.
⚠️ Warning: If the power supply is heated to 70°C and above (cannot be held in your hand for longer than 3 seconds), this may indicate a chain overload or a short circuit in the cable!
2. Poor quality or damaged cable
Often the fault is not the power supply itself, but USB-Cheap or worn wires have thin veins that can't handle high current:
- 🔌 Increased resistance (cable warms stronger than block)
- 🔥 Oxidation of contacts (dark spots on the connector)
- ⚡ Power loss (phone charges slower)
How to check the cable:
- Check USB-A or USB-C connectors for darkening, bending, or melting.
- Touch the cable while charging – if it’s hotter than the power supply, it needs to be replaced.
- Try another certified cable (such as the original one from Xiaomi or Anker).
Check the jacks for damage |
Compare the temperature of the cable and the power supply |
Test with another charger |
Check the charging speed (should match the power of the unit)-->
It's particularly dangerous to use cables with damaged insulation, which can short circuit, and if you see bare wires, stop using that cable immediately.
3. Power mismatch between charging and phone
Many users mistakenly believe that the more powerful the charger, the better, but if the power supply is too powerful for your smartphone, it can lead to:
- 📱 Overheating of the power controller in the phone (especially in budget models Redmi or POCO).
- 🔋 Accelerated battery wear (lithium-ion batteries do not like high currents).
- 🔥 Heating of the charger due to suboptimal load.
Example: If your Redmi Note 10 supports a maximum of 33W and you plug in a block on 67W, the phone will only take 33W, but the unit will run in sub-optimal mode and warm up more strongly.
| Xiaomi model | Max. Charging power. | Recommended power supply |
|---|---|---|
| Redmi 9/10 | 18W | 18W or 33W (automatically limited) |
| POCO X3/X4 | 33W | 33W (original or certified) |
| Mi 11/12 | 55W–67W | 67W (for full compatibility) |
| Black Shark 5 | 120W | Only the original 120W! |
Use chargers with power equal to or slightly higher than your smartphone’s maximum power, for example, a Redmi Note 12 (33W) will fit a 33W or 67W unit, but not a 120W unit.
4. Phone battery problems
If the charger is heated even with the original cable and power supply, the problem may lie in the smartphone battery. Over time, lithium-ion batteries degrade, their resistance increases, which leads to:
- 🔋 Increased charging time (phone takes longer to gain interest).
- 🌡️ Overheating during charging (the battery gives heat to the case and charger).
- ⚡ Current surges (the power supply is unstable).
How to check the status of the battery:
- Go to Settings → Battery → Battery Status (available on MIUI 12 and later).
- Use applications like AccuBattery (shows wear in %).
- Pay attention to the bloating of the case – if the screen or back cover bent, the battery needs to be replaced urgently!
⚠️ Warning: If the battery is swollen, you can't keep charging the phone! This could cause fire.Take the device to Xiaomi's service center.
What to do if the battery is swelling?
5. Network overload or poor-quality socket
Sometimes the reason the charger is heated is not in the charger itself, but in the electrical grid.
- 🔌 Old wiring (thin wires, oxidized contacts in the socket).
- 🌍 Voltage surges (often in homes with old infrastructure).
- 🔥 Overloading of the extension device (many devices in one socket).
How to check:
- Connect the charger to another outlet – if it warms less, the problem is the first.
- Use a network filter with protection against voltage surges.
- Check if the outlet itself is hot (this is a sign of poor contact).
If you live in a region with unstable voltage (e.g. 180-240V instead of the standard 220V), consider buying a voltage stabilizer to protect your equipment.
External factors: temperature and humidity
Xiaomi chargers (like any other) are sensitive to external conditions.
- ☀️ In the sun (for example, on the windowsill in the summer),
- 🔥 Near the heat sources (heater, kitchen stove),
- 💦 In a room with high humidity (bathroom, sauna),
It will warm up more, even without loading.
Optimal conditions for charging:
- 🌡️ Air temperature: 10–35°C.
- 💧 Humidity: up to 80%.
- 🚫 Avoid enclosed spaces (such as charging under the pillow!).
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If the charger has warmed up after being in the cold (such as in a car in winter), let it warm to room temperature before use.
Refused or counterfeit charger
One of the most dangerous causes of overheating is a non-original charger, and fake Xiaomis often have:
- 🔌 Low-quality components (cheap capacitors, thin tracks on the board).
- 🔥 Lack of protection against overheating or short circuit.
- ⚡ Inconsistency of declared power (block on "67W" only 20W).
How to distinguish the original from the fake:
| Sign. | Original | Fake. |
|---|---|---|
| Packaging | Tight cardboard, clear print, hologram. | Thin box, blurred inscriptions, no hologram |
| Weight. | Heavy (quality materials are used) | Light (empty body, fine details) |
| Inscriptions. | Clear, with full information (power, model, certificates) | Blurred, without details or with errors |
| Price. | Comparable to the official (for example, 67W block ~1500–2000₽) | Suspiciously cheap (e.g., cheap, "67W 300₽") |
If you suspect that your charger is a fake, don’t use it.Buy the original unit from Xiaomi’s branded store or from trusted sellers (for example, Wildberries, Connected with the “Original” mark).
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Even if a fake charger works, it can damage the phone's battery or cause a fire.Savings of 500-1000₽ risk-taking!