Xiaomi Redmi 4X is still a popular budget smartphone, but over time, many owners face a problem: the device began to charge too long. If before the battery was filled in 1.5-2 hours, now the process stretches for 4-6 hours or the phone refuses to charge without connecting to the outlet. What is the reason and how to return the previous speed? In this article, we will analyze all possible factors – from banal wear of the cable to hidden hardware malfunctions.
It is important to understand that the Redmi 4X did not initially have a record charging speed: its standard 5V/2A (10 W) adapter does not support fast charging technologies like Quick Charge or VOOC. However, even with this charging time, charging should not exceed 2.5-3 hours with proper equipment. If your smartphone has become forever “hang on the wire”, it’s time to conduct a diagnosis.
We're not going to be limited to general tips like "change the charge" -- in this article, you'll find step-by-step instructions, tests to test each component, and even ways to temporarily "resuscitate" a worn-out battery — FAQ Answering the Most Frequent Questions about Redmi 4X.
1. Battery wear is the main cause of slow charging
The Redmi 4X battery (the BM47 or BD47) is designed for 500 to 800 full charge cycles. After that, the capacity starts to fall steadily and the charging time goes up. If your smartphone is older than 3-4 years, the problem almost certainly lies in the battery.
How to check the wear:
- 📱 Install the AccuBattery app (free on Google Play) and it will show the actual battery capacity and wear and tear.
- 🔋 If the capacity has fallen below 1500-1800 mAh (at the initial 4100 mAh), the battery requires replacement.
- ⚡ Pay attention to the charging schedule: if the voltage jumps or the current drops to 200-300 mA, this is a sign of degradation.
Critical: When the battery is over 60 percent depreciated, it not only slowly charges, but it can also suddenly shut down when the 20 to 30 percent charge is not properly calibrated, so replacing the battery is the only solution.
⚠️ Warning: Don't use magic apps to "restore" the battery. They only reset the statistics in the system, but don't return the capacity. The only method that works is to completely discharge to 0% and charge to 100% without interruption (2-3 times). This will temporarily improve calibration, but will not return the lost capacity.
2.Problems with charger and cable
Even if you use Xiaomi's native adapter, it could fail, especially with cheap Chinese charging that comes with budget models.
- 🔌 Adapter power: the original unit for Redmi 4X must issue 5V/2A. If you connect the adapter to 5V/1A (For example, from an old iPhone, the charging current will fall into the 2 once.
- 🔗 Cable condition: bend over USB-If the phone starts charging/switching off, the wires break inside.
- 🔄 Port port USB: Try another connector on the charger or connect to your computer. If the speed doesn't change, the problem is your smartphone.
| Sign of malfunction | Probable cause | Decision |
|---|---|---|
| Charging is only in a certain position of the cable. | Wire break or contact oxidation in microUSB connector | Replace the cable or clean the port with alcohol |
| The phone only charges from the socket, not from the Power Bank. | Weak current from external battery (1A instead of 2A) | Use Power Bank with 2A output or original charging |
| Adapter warms up, but charging is slow | Failure of the voltage stabilization circuit in the power supply unit | Replace the adapter (the risk of short circuit!) |
3. MicroUSB connector contamination and contact oxidation
The microUSB connector in the Redmi 4X is one of the most vulnerable places, and over time, dust gets in, pile from your pockets, and the contacts become oxidized by moisture, which leads to poor contact and a drop in charging current.
How to clean the port:
- Turn off the phone and take out the battery (if possible).
- Take a wooden toothpick and carefully remove visible debris.
- Moisten the cotton swab in isopropyl alcohol (not vodka!) and wipe the contacts.
- Allow the port to dry for 10-15 minutes before connecting.
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If you don't have alcohol on hand, you can use an eraser to erase your pencil, and you can gently rub the contacts in the connector, and that will remove the oxides.
If the problem remains after cleaning, check the connector for mechanical damage:
- 🔍 Inspect the port with a flashlight: bent contacts or traces of corrosion (green plaque) indicate the need for repairs.
- 🛠️ In the service center, the connector can be replaced for 500-800 rubles (depending on the region).
4. Software failures: why the system is slowing charging
Sometimes slow charging is not about hardware, but about software constraints.
- 🤖 Optimization MIUI: The system can artificially limit current if it thinks the phone is overheating.
- 📵 Background Processes: Games or applications running in backgrounds increase the load on the processor and slow down charging.
- 🔄 Failures after the update: some versions MIUI 9–11 had power management bugs.
How to diagnose:
- Go to Settings → Battery → Battery Use and check which applications consume the most power.
- Turn off auto-update apps in Google Play and background social media activity.
- Reset the battery settings: Settings → System → Reset → Reset the battery settings.
How to turn off charging optimization in MIUI?
If the crashes started after the MIUI update, try rolling back to the previous version or resetting to factory settings (don’t forget to make a backup!).
5. Phone overheating: The hidden enemy of fast charging
The Redmi 4X is prone to overheating due to the Snapdragon 435 processor and compact body. At temperatures above 40–45°C, the system automatically reduces the charging current to avoid battery damage.
How to check the temperature:
- 🌡️ Install the app AIDA64 And open the Sensors section. Normal charging temperature is 30 to 38.°C.
- 🔥 If the temperature is above 45°C, unplug the phone from charging and let it cool down.
Causes of overheating:
- 🎮 Games or heavy applications (for example, PUBG Mobile or Genshin Impact during charging.
- ☀️ Direct sunlight or hot weather (especially if the phone is on the dashboard of the car).
- 🔋 A defective battery that warms even in a simple.
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Never cover your phone while charging (such as with a blanket or cover) this disrupts heat transfer and can cause the battery to bloat.
Failure of the power controller
If all previous methods failed, the problem may lie in the charging controller, the chip that controls the current on the battery. In the Redmi 4X, it is most often the BQ24193 chip or its counterparts.
Signs of Controller Failure:
- 🔌 The phone does not charge from any cable/charging, but determines the connection (the icon of the battery appears).
- ⚡ The charge is jerky: it turns on, then turns off.
- 📉 The battery discharges faster than usual, even when it is off.
What to do:
- 🛠️ Repair of the controller will cost 1000-2000 rubles (depending on the complexity of the).
- 🔧 If you are an experienced user, you can try to solder the chip yourself, but it is risky without soldering skills.
Try charging your phone from different adapters | Check if the area near the charging connector is warming | Make sure the phone has not been hit or dropped | Contact the wizard for multimeter diagnosis-->
7. Alternative methods of accelerating charging
If you replace the battery or repair the phone is not yet possible, you can temporarily improve the situation:
- ⚡ Airplane mode: disable all wireless modules (Wi-Fi, Bluetooth, GPS) It's going to reduce the load on the processor.
- 🔋 Disabling fast charging: paradoxically, sometimes disabling the option Quick charging in the battery settings stabilizes the process.
- 🛌 Charging in the off state: if the phone is turned off, the system does not waste energy on background processes.
You can also use external Quick Charge-enabled batteries (such as the Xiaomi Power Bank 3 Pro) that can deliver current up to 3A, which will speed up charging even on the old Redmi 4X.