Have you noticed that Xiaomi’s charger gets hot when connected to your phone — or even burns your fingers? — This is not always a cause for panic, but you can’t ignore the problem either. Heating your power supply can be both normal (especially when using fast charging technologies) and a sign of a malfunction that will eventually cause both charging and battery failures.
In this article, we’ll explore why Xiaomi’s charger warms up, from the Redmi Note 12 to the flagship Xiaomi 14, when it’s safe and when it requires intervention. You’ll learn how to diagnose the problem yourself, which charging models are most prone to overheating, and what to do to avoid damage to your equipment. And at the end, answers to frequent questions and a checklist to check your charger.
1.Fast charging is the main cause of heating
The most common reason Xiaomi's charging is hot is because of fast charging (Fast Charge, Turbo Charge, HyperCharge) and the higher the power output of the power supply (33W, 67W, 120W and higher), the more intense it heats up when it's running, and it's a physical process: some of the energy is dissipated as heat due to conductor resistance.
For example, chargers for Xiaomi 13 Ultra (120W) or Redmi Note 13 Pro+ (120W) can heat up to 50-60°C — that’s fine if the temperature stabilizes and doesn’t rise any further. But if the case gets unpleasantly hot (above 60°C) or continues to heat up after 30 minutes of charging, that’s cause for concern.
- 🔥 33W–67W: moderate heating (up to 50°C) is the norm for most Redmi and POCO models.
- ⚡ 80W–120W: High heat (up to 60°C) is typical of Xiaomi and Black Shark flagships.
- ❄️ 10W–18W: almost not warmed up – standard charging for budget models.
⚠️ Warning: If Xiaomi charges heat up to a temperature that cannot be held for more than 5 seconds, immediately disconnect it from the grid. This may indicate a short circuit or failure of the capacitors.
2. Unoriginal or damaged cables
Even if the power supply is in good condition, the cable can cause overheating, and cheap, non-original wires (especially without USB-IF certification) often have thin veins that are not designed for high currents, resulting in:
- 🔌 The resistance of the cable increases → more heat is released as the current passes.
- 🔥 Insulation or contacts are melted (especially at the USB-C or Micro-USB connector).
- ⚡ Charging speed drops — the phone may show “Slow Charging.”
How do you check the cable? Look at it for:
- 🔍 Cuts or inflections (especially at the base of the connectors).
- 🔌 Contact oxidation (green or black coating on plugs).
- 📏 Wire thicknesses are the original Xiaomi cables thicker than the "nouneim" analogues.
Check for cuts and inflections |
Check contacts for oxidation |
Connect to another power supply for the test |
Measure the temperature of the cable after 10 minutes of charging-->
If the cable is warmer than the power supply, it is 100% a sign of malfunction, replace it with the original or certified analogue (for example, from Anker or Baseus).
3. Problems with the socket or network voltage
The quality of the power grid directly affects the operation of the charger.
- 🔌 Low voltage (less than 200V) – the power supply operates at power limit, overheating.
- ⚡ Voltage surges - can damage the charging circuit.
- 🔥 Bad contact is sparking or heating of a fork.
How do you diagnose?
- Connect the charger to another outlet (preferably with grounding).
- Check the voltage in the network with a multimeter (should be 220V ± 10%).
- Examine the power supply plug for blackening or melting.
| Sign. | Possible cause | Decision |
|---|---|---|
| The charge is heated in only one outlet | Poor contact or line overload | Use another socket or extension with protection |
| The power supply plug is blackened | Sparkling due to poor contact | Replace the socket or power supply |
| Charging is warm even without a connected phone | Short circuit or circuit failure | Don't use it! Give it away for repair or disposal |
⚠️ Warning: If your home is often flashing lights or automatics are triggered, do not use high-power chargers (67W+) without a voltage stabilizer. This can cause both your charging and your phone to fail.
Failure of the charger itself
If Xiaomi charging is heated even when using the original cable and a serviceable socket, the problem may be its internal components:
- 🔋 Bloated capacitors are a common cause of overheating in cheap power supplies.
- 🔥 Oxidized or soldered contacts increase resistance.
- 🛠️ Burned transformer – Power supply can smell like a burn.
How do you check?
- Smell the charge – if you smell burning or plastic, it must be replaced urgently.
- Shake the power supply - if you hear noise or rattle, inside could be soldered parts.
- Disassemble the case (if you have experience) and inspect the board for bloated capacitors or blackened tracks.
What do swollen capacitors look like?
If the Xiaomi power supply is older than 2-3 years, its components could wear out, in which case it is better to replace the charge with a new one - repairs will cost more.
5. overheating of the phone and its effect on charging
Many people forget that the temperature of the smartphone directly affects the heating of the charger.
- 🎮 Games (Genshin Impact, Call of Duty Mobile)
- 📸 Video recordings in 4K.
- ☀️ Direct sunlight.
- the power supply is forced to work in a strengthened mode to compensate for the loss of energy for heating the battery.
How does that manifest?
- 🔥 Charging is warmer than normal.
- ⚡ Charging speed drops (the phone may show "Cooling...").
- 📉 The battery is discharged more quickly after disconnection from the network.
Decision:
- Close all background applications before charging.
- Remove the phone case (especially if it is thick or silicone).
- Do not use your phone while charging for resource-intensive tasks.
💡
If your Xiaomi supports Optimized Charging (in battery settings), turn it on, which will limit charging current at high temperatures and prolong battery life.
6. Use of incompatible chargers
Many users mistakenly believe that any charger with the right power will work for Xiaomi, but this is not true:
- 🔌 Power supplies without Quick Charge support may provide unstable voltage.
- ⚡ Charges from other brands (such as Samsung or Apple) may not be properly aligned with charging protocols.
- 🔋 Universal turbochargers with Aliexpress often do not meet the declared characteristics.
What happens if you use incompatible charging?
- 🔥 Overheating of the power supply and cable.
- ⚡ Slow charging (or vice versa, too fast, which is bad for the battery).
- 📵 Risk of damage to the power controller in the phone.
How do you check compatibility? Use only chargers:
- 🔍 Marked as Mi Charge Turbo, Redmi Fast Charge or Qualcomm Quick Charge.
- 🛡️ With USB-IF certification (logo on packaging)
- 📋 From the official list of compatible accessories on the Xiaomi website.
External factors: dust, moisture, mechanical damage
Sometimes the cause of overheating lies in external conditions:
- 🌫️ Dust in connectors - impairs contact and increases resistance.
- 💧 Moisture - may cause short circuiting.
- 🔨 Hit or fall – damages the internal components of the power supply.
How do you prevent it?
- Clean your phone’s USB-C connector and charger port from dust regularly (you can use a toothpick or compressed air).
- Do not use charging in wet areas (bathroom, kitchen next to the sink).
- Avoid mechanical loads on the power supply (do not drop, do not put heavy objects on top).