Fast charging is a convenient feature that saves time, but does not always benefit the battery. Xiaomi Redmi 8T owners often face overheating or accelerated battery wear due to high charging currents. Disabling this option can extend the life of the smartphone, especially if you use non-original chargers or operate the gadget in extreme conditions.
In this article, weβll look at all the ways you can deactivate fast charging, from standard settings to hidden options in the engineering menu, how to safely change power settings, what risks you have when using third-party utilities, and what to do if the function doesnβt turn off, and how to check if charging has actually become βslowβ after you manipulate it.
Before you start setting up, make sure your Redmi 8T is at least 30% charged, which minimizes the risk of a sudden shutdown during a change in settings, and prepare the original cable and adapter, which will be needed to test the results.
Why you should turn off fast charging on Redmi 8T
The Redmi 8Tβs Quick Charge 3.0 technology allows you to charge up to 50% of your battery in 30-40 minutes, but there is a downside to this advantage:
- π₯ Overheating of the body - with intensive charging, the battery temperature can exceed 40Β°C, which adversely affects its capacity.
- π Accelerated battery degradation β Lithium-ion batteries lose up to 20% of capacity after 500 fast-charging cycles (vs 800β1000 cycles at standard battery packs).
- β‘ Risk of damage to the power controller β non-original chargers can deliver unstable voltage, leading to failures.
Xiaomi does not advertise this fact, but the technical documentation for the Redmi 8T indicates that the optimal battery life temperature is up to 35 Β° C. Exceeding this threshold by 10 Β° C reduces battery life by 30-40%. If you notice that the smartphone began to discharge faster than a year ago, the reason for this may be the regular use of Quick Charge.
β οΈ Warning: Turning off fast charging won't restore lost battery capacity, but slows down further battery degradation. If the battery is already swelling or holds a charge for less than 2 hours, a replacement is required.
Method 1: Disconnect via standard MIUI settings
The easiest and safest method is to use the built-in system options. In MIUI 12/13 (current for the Redmi 8T), the path to charging settings may vary depending on the firmware version.
- Open Settings (the gear icon on the main screen).
- Go to the Battery and Performance section.
- Slip on Battery Settings.
- Find the option Fast Charging (or Optimized Charging in newer versions of MIUI).
- Move the slider to the off position.
If Fast Charging is not on the menu, your version of MIUI does not support it, in which case try updating the firmware or using alternative methods described below.
Check the version of MIUI in Settings β About the phone
Connect the original cable and adapter
Charge your phone at least 30%
Backup important data (in case of failure)
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How do you check if the blackout worked? Connect your smartphone to charge and look at the indicator next to the USB-C connector:
- π’ Green is the standard charging color (5V/2A).
- π Orange/Red β Fast charging (9V/2A or 12V/1.5A).
β οΈ Note: On some firmware, the Fast Charging option may automatically turn on after restarting. If this happens, use the method with the engineering menu (section 3).
Method 2: Engineering menu (for experienced users)
If standard settings fail, you can use the hidden engineering mode, which requires caution: incorrect actions can lead to system failure.
Instructions:
- Open the phone app and enter the combination: ##4636##
- In the menu that appears, select Battery Information.
- Scroll down to the Charging Configuration section.
- Find the Fast Charge and set the Disabled value.
- Save the changes and restart the device.
On some versions of MIUI, the path may be different. If the ##4636## combination doesn't work, try:
##36446337## β CIT Test β BatteryWhat to do if the engineering menu is not opened?
| Parameter | Value for fast charging | Value for standard charging |
|---|---|---|
| Voltage (V) | 9β12 V | 5 V |
| Current strength (A) | 1.5β2 A | 1β1.5 A |
| Battery temperature (Β°C) | 38β45 | 30β35 |
| Full charge time. | 1.5 hours to 2 hours | 3-4 hours |
Important: After changes to the engineering menu, charging may become unstable β the device will turn on and off the fast mode. In this case, reset the network settings (Settings β System β Resetting β Resetting Wi-Fi, mobile network and Bluetooth settings).
Method 3: Applications for Charging Control
If you don't want to dig into the settings, you can use third-party utilities that not only turn off fast charging, but also set a charge limit (for example, up to 80%), which prolongs the life of the battery.
Top.-3 tested applications:
- π± AccuBattery β monitors battery status and limits charging current. Suitable for all versions of Android.
- β‘ Battery Charge Limit β allows you to set a charge threshold (recommended 70-80.
- π§ Quick Charge Disabler is a specialized utility for disabling Quick Charge. It works without root, but can conflict with the use of the Quick Charge. MIUI.
Instructions for AccuBattery:
- Install the app from Google Play.
- Open the Charging section.
- Activate the option Charge current limit.
- Set the maximum current value at 1000-1500 mA (standard charging).
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If after installing the application, charging began to break, turn off battery optimization for it in Settings β Applications β Special Access β Battery Optimization.
Note that most applications require disabling MIUI Optimizations.
- Turn on Developer Mode (7 times tap the MIUI version in Settings β About Phone).
- Back to Settings β Additionally. β For developers.
- Find the option to Disable MIUI Optimization and activate it.
Method 4: Change the configuration file (for advanced)
This method is suitable for root-rights or custom recovery (TWRP) users, and allows you to permanently disable fast charging at the system level, but requires care.
Instructions:
- Install Root Explorer or any other file manager with root access.
- Cross the path: /system/etc/battery_charging.conf.
- Find the lines: fast_charge = 1 ac_charge_current = 2000
- Replace them with: fast_charge = 0 ac_charge_current = 1000
- Save the file and restart the device.
If the file battery_charging.conf No, so your firmware uses a different charging mechanism, so you can try editing the file. /system/vendor/build.prop, line:
persist.sys.fastchg=falseβ οΈ Warning: Incorrect editing of system files can lead to bootloop ( looped reboot). TWRP!
π‘
Changing configuration files is the most reliable way to turn off fast charging forever, but it requires root rights and is risky for beginners.
Method 5: Hardware shutdown (for extremes)
If software methods don't work, the radical option is to modify the charger, which is only suitable for users with soldering skills and an understanding of electrical circuitry.
What you need:
- π§ A soldering iron with a thin sting (power 20-30 W).
- π Multimeter for testing resistance.
- 𧲠Magnetic screwdriver (for disassembling the adapter).
- π οΈ shrink-tube or seal.
Instructions:
- Disassemble the charger (carefully poke the case with a knife or plastic card).
- Find the resistor responsible for identifying the fast charge (usually labeled as R1 or R2 near USB-port).
- Remove the resistor or replace it with another one with a resistance of 56 kOhm (this will make the adapter work in standard 5V/1A mode).
- Check with a multimeter that the output voltage does not exceed 5 V.
- Collect the adapter and test the charging.
Advantages: guaranteed to turn off fast charging at the hardware level, regardless of the phone settings. Disadvantages: the risk of damage to the adapter, loss of warranty (if it is still valid), the inability to return fast charging without resolding.
How do you find the right resistor?
How to check if fast charging is actually off
It's not enough to just change the settings -- you need to make sure that the smartphone is actually charging in standard mode. Here are 3 reliable ways to check:
- Through AIDA64: Install the app AIDA64 Go to the Battery section. See the voltage and charging current settings: π 5.0 V / 1.0-1.5 A - standard charging. β‘ 9.0β12.0 V / 1.5β2.0 A β fast charging.
- Enter the combination ##4636##. Select Battery Information. Check the AC Input and Charging Status fields.
Through the ammeter:
- Connect. USB-Tester (e.g. Xiaomi) USB Tester) between adapter and cable.
- Charging with 5V/1A values confirms the Quick Charge is disabled.
If after all the manipulations the smartphone is still charged in accelerated mode, check:
- π Whether you use the original cable and adapter (non-original can ignore the settings).
- π± Is the firmware updated to the latest version (in older versions) MIUI Fast charging may be forced on).
- π Have you reset your settings after rebooting (characteristic of some custom firmware).
Frequent Mistakes and How to Avoid Them
When you turn off fast charging, users often face typical problems, and here are the most common ones and how to solve them:
| Problem. | Reason. | Decision |
|---|---|---|
| Settings are reset after rebooting | MIUI automatically restores default parameters | Use the Engineering Menu or edit system files |
| The phone doesn't charge at all. | Misrepresentation battery_charging.conf | Restore the original file from the backup or reflash the device |
| The charge is jerky (it turns on, then turns off) | Conflict with MIUI optimizations or third-party software | Turn off battery optimization for apps in settings |
| The adapter stopped working after the rationing | Short circuit or damage to the controller | Check the circuit with a multimeter or use a different adapter |
The most common mistake is using unoriginal cables, because cheap wires often don't support charging mode data protocols, which may cause your phone to ignore your settings, and always check the cable on another device before diagnosing problems.
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If the phone starts to run out faster than usual after the fast charge is turned off, then the battery is already worn out, in which case only a replacement of the battery will help.