How to turn off fast charging on Xiaomi Redmi Note: the full guide

Xiaomi’s current Redmi Note series smartphones are powered by powerful batteries and support accelerated charging technologies such as Quick Charge or the company’s HyperCharge. This is convenient when you need to quickly restore power, but at night or with a long connection to the grid, high speed can lead to heating of the device. Users often wonder whether it is possible to forcefully limit the power coming from the adapter to extend the overall life of the lithium polymer battery.

Unfortunately, the standard MIUI or HyperOS shell settings often lack an obvious switch that would allow a single touch to turn off accelerated charging mode.The default system tends to charge the gadget as quickly as possible, ignoring the owner's preferences regarding body temperature. However, there are proven ways to get around this limitation and make the phone charge in normal mode using standard 5 or 10 watts instead of maximum values.

In this article, we will take a look at all the available methods, from simple cable replacement to the use of engineering menus and third-party applications, and learn what energy saving settings can affect this process, and whether you should worry about heating at all when using the original power supply. It is important to understand the difference between the software limitation and the physical characteristics of the accessories used.

⚠️ Note: Using non-standard methods of interfering with system settings or using an engineering menu can lead to unstable operation of the device. All actions you perform at your own risk, so before experimenting, make sure that your data is stored.

Why it is necessary to limit the charging speed

The main reason Xiaomi Redmi owners are looking for a way to turn off fast charging is because of the physics of the chemical processes inside the battery. When high current is applied, a more intense oxidation reaction occurs, which inevitably leads to a rise in temperature. If the device is in a case or lying on a soft surface, the heat sink deteriorates, and the battery begins to degrade faster.

In addition, many users leave the smartphone to charge all night, in which case the high rate of filling the capacity does not make sense, since you have 6-8 hours of free time, and it is much more important in this situation to minimize stress for the power controller and battery cells, ensuring a smooth and "cold" charge set.

Another factor is the wear of the USB Type-C or Micro-USB connector. High currents require perfect contact. If dust has accumulated in the connector or contacts have oxidized, the handshake protocol's attempt to match high power can lead to periodic screen shutdowns or interruption of the charging process, which is also not useful for electronics.

Physical methods of reducing power: cables and blocks

The easiest and safest way to get your Redmi Note to charge slowly is to change the physical power circuit. Rapid charging protocols like Qualcomm Quick Charge or Power Delivery only activate after a successful handshake between the controller in the power supply and the controller in the phone, and if you break that connection, the device goes into safe mode.

Using old or poor-quality cable is an effective method: thin wire cables have high resistance, which physically prevents high-power current from being passed, the phone "understands" that the cable is not capable of providing high power, and automatically reduces the input current to standard values, usually about 1 Ampere at 5 Volts.

You can also use a power supply from an old smartphone or any other device with less than 10 watts. If you connect Xiaomi to charge from a push-button phone or an old iPhone model, fast charging simply won't start. This ensures that the battery will gain power slowly, without voltage surges and overheating.

• 🔌 Use a cable with one living data working or damaged insulation to disrupt handshake protocol.
• 🔋 Connect the phone to USB-port of a computer or television where the current is limited by a standard USB 2.0/3.0 (0.5–0.9 And).
• 📉 Replace the original power supply with a universal power adapter 5W (5 Volts / 1 Ampere).
• 🚫 Avoid using wireless chargers if your goal is to minimize heating, as they often warm themselves.

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If you use the cable only for charging, you can gently tape the central contact inside the USB-A connector with insulation tape, which often prevents the activation of fast charging modes.

MIUI software settings and system optimization

Although there is no direct button on the menu, there are functions in the MIUI shell that indirectly affect this process. First of all, you should pay attention to the Settings → Battery section. Here you can activate the power saving mode, which limits background activity and can slightly slow the charging process, preventing peak loads.

And the new firmware versions also have the Optimized Night Charging feature, which learns your habits, and if you put your phone on overnight charging, it charges it to 80 percent first, then slowly reaches 100 percent by the time you wake up, and it doesn't shut down fast charging completely, but it reduces the battery time at high voltage.

Some users recommend turning off the phone while charging.In the off state, the Redmi Note does not consume energy on the screen and applications, but the power controller will still take the maximum possible current from the adapter, unless the physical limitations described above are used.

Using an engineering menu to limit current

For more advanced users, you can access hidden settings through the engineering menu, which is a system section designed for testing equipment, where you can find parameters that regulate battery behavior, and to get there, you need to open the Phone app and type a special combination: ##6484## or #3646633###.

Once you're on the menu, you go to the Hardware Testing tab, then you select Power and then Battery Log or Charging Current. In some versions of MIUI firmware, you can find a parameter limiting the maximum charging current. However, the interface may differ depending on the CPU model (Snapdragon or MediaTek) and the Android version.

Be very careful: changing unknown parameters in the engineering menu can cause the phone to stop seeing the charger at all or start charging with a critically low current. Before making any changes, write down the initial values so you can return the settings back.

Third-party applications and Root rights

If standard methods fail, you can turn to third-party software, and applications like Battery Charge Limit or AccuBattery allow you to monitor battery status and, if you have Root rights, programmatically turn off the current when you reach a certain percentage, which does not reduce the charging speed directly, but prevents overcharging and heating at the top of the capacity range.

To fully control the charging current, you need super-user rights. With utilities like the Kernel Adiutor, you can directly control the power controller drivers. You can set a limit of, say, 1,000 mA, and the system will ignore the power supply by charging slowly.

Obtaining Root rights (via Magisk) automatically voids the warranty on the device and can disrupt banking applications and Google Pay. Furthermore, inept interference in the kernel of the system can lead to a "boot" (cyclical reboot).

• 📱 Install AccuBattery to monitor battery health and wear rate.
• 🛡️ Get Root rights only if you are willing to lose your warranty and risk the stability of the system.
• ⚙️ Use Kernel Managers to Finely Tune Charging Current Limits.
• 🔄 Make a full backup of data before obtaining superuser rights.

⚠️ Note: Install applications from unknown sources and modify system files through Root rights can make your device vulnerable to viruses. Make sure you only download software from trusted repositories such as Google Play or GitHub.

Effects of ambient temperature on charging

And the external factor, temperature, is not to be ignored. Redmi Notes have thermal sensors that automatically reduce charging current when you overheat. If you want to slow it down, you can put it in a cool place, but not in the fridge! Just remove it from the sun sill or from under the pillow.

At low temperatures (below +10°C), the chemical reactions in lithium batteries slow down, and the controller itself limits the current to prevent the loss of metallic lithium on the anode. However, charging the phone in the cold is absolutely impossible, this will lead to irreversible damage to the battery. The optimal temperature for "slow and healthy" charging is room, about +20°C.

Remove the protective case while charging, especially if it is thick or made of materials with low thermal conductivity. This will ensure better heat exchange with air. Even if you do not turn off fast charging software, a good heat sink will allow the controller to keep high current longer without going into trottling mode.

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The safest way to slow down charging without risk to the system is to use a weak power supply (5V/1A) and a good heat sink.

Frequently Asked Questions (FAQ)