Owners of the legendary Xiaomi Redmi 4X often face a sudden message on the screen: “battery temperature is over.” This system dialog blocks the ability to charge the device, leaving the user without communication. The problem is that the power controller receives a signal from the sensor that the temperature is critically exceeded, usually above 45-50 degrees Celsius, and forcibly breaks the circuit to avoid explosion or fire.
But it's not always hot to the point of danger, and it's often a software failure, a sensor readings that are stuck, or a plume contacts that are oxidized. The MIUI system is extremely sensitive to any variation in the voltage and thermodynamics, so even a small error causes a protective reaction, and it's important to understand that you can't ignore this message, because the constant overheating irreversibly destroys the chemical structure of the battery.
In this article, we will look at all the possible causes of a fatal error on the Redmi 4X and propose an algorithm for actions: from software calibration to replacement of hardware components. You will learn to distinguish between real overheating and false alarm system.
Diagnostics of the real state of the battery
Before you start complex manipulations, you need to rule out real physical overheating. Touch the back cover of the device and the area around the camera. If the case is hot, leave the phone off for 30-40 minutes in a cool place. The temperature of lithium polymer batteries is critical for their longevity.
If the phone is cold or barely warm, and the "battery temperature is over xiaomi redmi 4x" error keeps popping up, then the problem is transferring data from the sensor to the processor, in which case resetting the battery usage statistics helps, and this requires root rights and a file manager with access to the system folders.
⚠️ Warning: Forced charging of a cold phone that shows an overheating error can cause the battery to bloat.First make sure the device is really not hot.
Check which applications are running in the background. Sometimes heavy software or a virus miner can load the processor, causing local heating, which is fixed by the sensor. Close all programs and see if the warning disappears. If the problem is kept in safe mode, then it is the hardware or system files.
Software methods of error resetting
The easiest way to try to fix the situation without disassembling the case is to completely reboot the system with the cache clearing. Press the power button and select "Switch off." After turning off, press Volume Up + Power to enter Recovery mode. Select "Wipe Cache" (do not confuse with Wipe Data so as not to lose photos and contacts).
If a simple cache cleaning didn't work, try calibrating the battery through the engineering menu. Dial the dial code ###6484##. In the CIT menu that opens, select "Battery info" or "Battery Test." This shows the current sensor readings. If you see abnormal values, such as 60 degrees at room temperature, the sensor is malfunctioning software.
For advanced users, there is a method of resetting a file battery_stats.bin. This file stores the history of charges and discharges, and when it is deleted, it forces the system to recalibrate the charge indicator and temperature thresholds.
In some cases, installing third-party monitoring utilities such as Cpu-Z or Ampere helps, and they allow you to see more detailed information than the standard MIUI menu. If third-party software shows a normal temperature (25-35 degrees) and the system writes about an error, then the driver or firmware is in conflict.
Hardware causes and oxidation of contacts
The Redmi 4X has a design feature: the plume connecting the main board to the sub-board often oxidizes or departs. It is on the lower board that the charging connector is located, and often additional sensors are located. If contact is broken, resistance rises, which causes heating and false temperature readings.
You need to open the back cover carefully (plastic, but it requires a hair dryer to soften the glue), unscrew the screws that fix the plastic frame, and disconnect the plume. Carefully examine the contacts. If you see white or greenish coating, it is oxidation. Clean the contacts with alcohol or a special tool Contact Cleaner.
Often, the problem is solved by simply soldering or replacing the charging plume. It's an inexpensive component that's sold in any parts store. Also check the Micro-USB connector itself: if it's shattered, contact with the charger is unstable, causing voltage surges and heating.
| Symptoms. | Probable cause | Method of decision |
|---|---|---|
| Error in connecting the ZU | Oxidation of sub-board contacts | Cleaning with alcohol, replacing the plume |
| The phone is warming up on standby | Short circuit in the chain | Diagnostics of the board, replacement of the controller |
| Unintentional shutdowns | Battery wear and tear | Replacing the battery with a new one |
| Mistake after fall | Battery connector waste | Reconnecting the ACB plume |
⚠️ Note: When disassembling Redmi 4X Be very careful with the fingerprint scanner plume, which is very thin and easily breaks when you're not careful.
Battery wear and replacement of the power supply
If your Xiaomi Redmi 4X has been around for a few years, it's probably exhausted, and the internal resistance of the old battery is increasing, which leads to rapid and strong heating even with low charging current, and the controller reads that heat and locks the device.
Visually inspect the battery after the back cover is removed, bloating is the main sign that the battery needs to be disposed of urgently, using a ballooned battery is dangerous: it can burst, emitting caustic fumes, or ignite, and the chemical reaction inside such cells becomes uncontrollable.
When replacing, use only original batteries or quality analogues from proven brands (Nohon, Cameron Sino). Cheap Chinese copies often do not have a proper protection controller, which can lead to a recurrence of the "battery temperature is over" problem after a month of operation.
Problems of the power controller and the payment
In rare cases, the problem lies deeper in the power controller itself (PMIC) on the motherboard, where if the phone gets rained or liquid spills into it, the paths leading from the thermal sensor to the processor could oxidize, in which case even a new battery and plumes won't help.
It requires professional diagnostics under a microscope. The wizard has to ring the circuit of the thermal sensor. If the resistance of the circuit is infinite or, conversely, zero (short circuit), you have to re-sweeten the resistors or the sensor itself. This is work for the service center.
Sometimes it helps to "warm up" the board in a special thermophen (rebolling), but at home it is absolutely impossible to do this - you can finally kill the processor. BGA-components, do not try to heat the charge yourself.
Preventing overheating in the future
To prevent the "battery temperature is over" error from returning, it is important to follow the rules of operation: Do not use the phone while charging, especially during heavy games or the navigator. This creates a double load: charging warms the battery, and the processor adds heat.
Use original or certified chargers. Cheap power supplies with AliExpress often produce a "dirty" current with pulsations, which harms the Redmi 4X charge controller. Also avoid leaving your phone in the sun or in the car in the summer.
- 🔋 Do not discharge your phone to zero regularly, try to charge at 20%.
- 🌡️ Remove a thick case during fast charging for better heat sink.
- 📱 Keep an eye on updates. MIUI, Sometimes Xiaomi fixes calibration bugs in patches.
- 🚫 Do not use your phone if it is already hot – let it cool down.
These simple rules will prolong your device's life, and the heat is the enemy of electronics, and the temperature care will make it easier to forget about sensor errors for a long time.