Why does the Redmi Note 6 Pro battery run out quickly and how to fix it?
The Xiaomi Redmi Note 6 Pro, released in 2018, is still popular with users due to its balanced performance and reliable “iron” base. However, over time, even the best-quality battery starts to work incorrectly: the phone suddenly turns off at 20-30% charge, charging jumps from 1% to 10% in seconds, and autonomy is reduced by many times, the reason is the desynchronization of the battery controller with a real charge level.
Battery calibration is the process of matching the data of the power controller (the chip responsible for monitoring the charge) with the actual battery capacity. On the Redmi Note 6 Pro, this procedure is especially relevant due to the features of the firmware. MIUI And the age of the device, and unlike newer models, where calibration is often automatic, it requires manual intervention, but before we do that, it's important to understand that the problem is not with the battery itself, but with the software management of the battery.
In this article, we will discuss:
- 🔍 Signs that indicate that the battery needs calibration.
- ⚡ 3 Proven Calibration Methods (Including Hidden Functions) MIUI).
- 📊 How to check the actual wear of the battery and when it is time to change it.
- ⚠️ Mistakes that 90% of users make when calibrating.
If your Redmi Note 6 Pro is lying about its charge percentage or shutting down 15-20%, don’t rush to buy a new battery. In 70% of cases, the right calibration helps.
Signs Redmi Note 6 Pro battery needs calibration
The power controller on the Xiaomi Redmi Note 6 Pro can fail for several reasons: deep discharge, frequent voltage drops, firmware updates or even banal battery aging.
- 📉 The phone turns off at 20-30% charge, although the indicator shows a normal level.
- ⚡ After charging, the percentage of charge “jumps” (for example, from 1% to 15% per second).
- 🔄 The battery charges to 100% in 10-15 minutes, but just as quickly discharges.
- 🔋 B Settings → The battery discharge schedule is uneven (sharp jumps).
- 🛑 The “Charge suspended” notification appears at 80-90%, although the function is disabled.
If you know any of these signs, the battery controller is out of sync with the actual battery capacity, which is not a critical failure, but it is not worth ignoring: over time, incorrect data can lead to a deep discharge that kills lithium-ion batteries.
Before you start calibrating, check the wear of the battery.
- Install the AccuBattery app (free on Google Play).
- Charge the phone to 100% and use it to full discharge (before turning it off).
- Open the Health tab in the app – there will be actual wear and tear in percentage.
⚠️ Warning: If you wear more than 60 percent, calibration won't help, you need to change the battery, and if you wear 30 to 50 percent, the calibration will be temporary, but the problem will come back soon.
Calibration Preparation: What to Do in Advance
Calibration of the battery on the Redmi Note 6 Pro is a slow and pre-prepared process, and if you ignore this step, you risk the opposite effect: the controller will "fall" even more, and the autonomy will deteriorate.
Disable all background applications
Charge your phone to 100% original
Turn off the function "Adaptive charging" in the settings
Backup of important data
Prepare 4-5 hours of free time-->
Now, more details on each item:
- 🔌 Use the original charger. Cheap RAMs can give unstable voltages, which will negate the calibration. 6 Pro (5V/2A).
- 📵 Turn off all applications except system applications. Background activity interferes with accurate charge measurement. → Annexes → Autostart and turn off everything except MIUI System and Google Services.
- ⚡ Deactivate Adaptive Charging. This feature (in Settings) → Battery → Charging modes artificially limit the charge to 80-90%, which will prevent calibration.
- 🕒 Allocate 4-5 hours. The full discharge-charge cycle takes a long time, it can not be interrupted.
We also recommend resetting the battery statistics before calibration.
- Go to Settings → System → Additional → Resetting settings.
- Select “Reset Battery Statistics” (not to be confused with a full reset!).
- Confirm the action.
⚠️ Warning: Do not use your phone during calibration! Any manipulation (calls, games, video) will distort the controller's data.
Method 1: Calibration through full discharge (classical method)
This is the most reliable and versatile method that works on all Xiaomi smartphones, including the Redmi Note 6 Pro. Its essence is a forced reset of the controller data by completely discharging and then “training” the battery.
- Charge your phone to 100% (use the original RAM) and wait for the indicator to show "Full charge."
- Turn off charging and use the phone as normal until it turns off itself (up to 0%).
- Don't turn on your smartphone right away! Wait 3-4 hours - this is necessary to completely dry up the residual charge.
- Charge your phone to 100% again, without turning it on. When charging is complete, keep the RAM plugged in for another 1-2 hours (to "stabilize").
- Turn on your smartphone and check the battery.
This method works in 80% of cases, but has disadvantages:
- ⏳ It takes a lot of time (up to 6-8 hours with due regard to the expectation).
- 📴 Deep discharge is harmful to lithium-ion batteries if repeated often.
If the problem persists after calibration, proceed to the next method.
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After calibration, avoid charging your phone overnight, which reduces battery life, and it is optimal to keep the charge in the range of 20-80%.
Method 2: Calibration through the engineering menu (for advanced)
The Redmi Note 6 Pro has a hidden engineering menu that allows you to reset battery data at the system level, which is faster than the classic one, but requires caution: wrong actions can lead to malfunctions in the phone.
Instructions:
- Open the phone app and enter the code: ##4636##
- In the menu that opens, select “Battery Information”.
- Look at the Battery Health parameter, if it's below 80 percent, calibration might not help.
- Return to the main menu and select “Battery usage statistics”.
- Click on the three dots in the top right corner and select Reset.
- Confirm the action and restart the phone.
After the reboot:
- 🔋 Charge your phone to 100% without interruption.
- 📵 Turn off the charging and let the battery discharge to 10-15% (not to 0!).
- 🔌 Reconnect the ROM and charge to 100%.
⚠️ Warning: Do not change other options in the engineering menu unless you know their destination! For example, changing the Radio Information settings may cause you to lose your network.
This method is less aggressive than full discharge and is suitable for prophylactic calibration every 3-4 months.
What to do if the engineering menu is not opened?
Method 3: Calibration through ADB (for power users)
If the first two methods did not help, you can try to reset the battery data through the ADB (Android Debug Bridge. This is the most radical way to connect your phone to your computer:
- 🔧 You’ve tried classical calibration before, but the problem remains.
- 📊 The engineering menu doesn't work.
- 💻 You have access to a PC with drivers installed ADB.
Instructions:
- Download and install Platform Tools from the official Android Developers website.
- On the phone, turn on the debugging. USB (Settings → The phone. → Version. MIUI → Click on version 7 times, then go back to Settings → Additionally. → For developers → Debugging by USB).
- Connect the Redmi Note 6 Pro to your computer and open the command line in the folder with ADB.
- Enter the command to reset the battery data: adb shell dumpsys battery reset
- Then execute the command to reboot: adb reboot
After the reboot:
- 🔌 Charge your phone to 100% without turning it off (even if it shows 100%, hold it for another 1-2 hours).
- 📵 Discharge to 5-10% and recharge to full.
ADB-If you’ve never worked with Android Debug Bridge, you’d better go to the first or second method.
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ADB-Calibration resets the controller data at the system level, but requires precise execution of commands. Errors in the code can cause malfunctions in the phone.
How do you check if the calibration has worked?
After any of the procedures, you need to make sure that the calibration is successful.
| Method of verification | What do you do? | A sign of success |
|---|---|---|
| 📊 Graphic discharge | Open the Settings. → Battery and look at the usage schedule. | The discharge line runs smoothly, without sharp jumps. |
| ⚡ Charging test | Connect the RAM and watch the percentages in real time. | The charge increases gradually, without jumping (for example, from 1% to 15%). |
| 🔋 Time to work. | Use your phone in normal mode (social networks, messengers, calls). | Autonomy increased by 15-30% compared to the “before”. |
| 📱 Forced shutdown | Discharge the phone to 0% and wait for the automatic shutdown. | The phone turns off at 0.5%, not at 20-30%. |
If after calibration problems remain, two options are possible:
- The battery is physically worn out (wear and tear). >50%. Solution: battery replacement.
- The power controller is damaged (rarely, but it happens) and the solution is diagnostics at the service center.
In 90 percent of cases, calibration solves the problem of "lies" of percent, but it doesn't increase the actual battery capacity, and if the autonomy is still low, wear and tear is to blame, not software failure.
Top.-5 Errors in calibration of the Redmi Note battery 6 Pro
Many users make the same mistakes that not only make calibration less effective, but make things worse.
- 🔌 Use non-original RAM. Cheap charging gives unstable voltage, which knocks the controller down.
- 📵 If you start calibrating, finish it (especially with full discharge).
- ⚡ Charging your phone overnight. Keeping 100% charge constantly shortens battery life.
- 🔧 Resetting to factory settings. It's not equivalent to calibration and can delete important data.
- 📱 Use the phone during calibration. Background processes distort the controller's data.
And many people mistakenly think that you should calibrate monthly.
- 🔋 For a new battery is enough 1 time in 6 months.
- 📉 For batteries older than 2 years - 1 time in 3 months.
- ⚠️ If we wear it. >40%, calibration is useless - need a replacement.
Another common mistake is using Google Play calibration apps, and most of them either don't work or contain malicious code. MIUI or ADB.