The battery is one of the most vulnerable components of a smartphone, and the Xiaomi Redmi Note 8T is no exception. After 1.5-2 years of active use, the battery capacity can decrease by 20-30%, leading to rapid discharge, sudden blackouts and overheating. But how do you know exactly what the battery is in your device? In this article, we will analyze all available methods, from hidden engineering codes to specialized applications, and learn how to interpret the results.
It's important to understand that battery health is not just determined by wear percentage, but also by parameters such as internal resistance, charging/discharge rate, and temperature. For example, if your Redmi Note 8T discharges in 4-5 hours with moderate use, this is a signal of critical wear and tear. Next, you will learn how to diagnose the problem yourself - without going to the service center.
1. Check through the engineering menu (code ##4636##)
The fastest way to get basic battery information is to use a hidden engineering menu, which requires no additional apps and works on all Xiaomi Android smartphones.
Instructions:
- 📱 Open the phone app and enter the combination: ##4636##.
- 🔍 In the menu that opens, select Battery Information).
- 📊 Note the parameters: Level – current percentage; Status – should be Charging (charged) or Discharging (discharged); Health – ideal Good; Temperature – norm 25–40°C.
⚠️ Warning: If the Health field says Unknown or Dead, it means critical battery failure, and it is recommended to replace the battery immediately, as it may swell or fail at any time.
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If the engineering menu does not open, try entering the code through the Calculator app: dial (()()4636) and press =.
2.Use of the AccuBattery application
AccuBattery is one of the most popular battery monitoring apps, and it not only shows current wear, but it also analyzes charging cycles, temperature and discharge rates. It's free, but it has advanced reports available in the pro version.
How to use:
- 📥 Install AccuBattery from Google Play.
- 🔋 Connect your smartphone to charging and wait for the app to collect data (usually requires 2-3 charge/discharge cycles).
- 📊 Go to the Health tab. You'll see here: 🔋 Design capacity - the real capacity of the battery in mAh; 📉 Wear - Percentage of capacity loss; 🔄 Number of charging cycles - the more, the stronger the wear.
Example: If the original capacity of the Redmi Note 8T was 4,000 mAh and the AccuBattery is 3200 mAh, then the battery is worn out by 20%, which is the threshold after which you should think about replacing.
Do not leave your smartphone on charging overnight |
Use the original power adapter |
Avoid overheating (do not play games while charging)|
Contact the service for diagnosis-->
3. Analysis via Mi Fit or Mi Home (official methods)
Xiaomi has integrated battery diagnostic tools into its proprietary applications, but they don’t work on all models and require authorization from the Mi Account.
Methods of verification:
- 🏠 Mi Home: Open the app and go to Profile → My devices. Choose your Redmi Note. 8T. Press Diagnostics. → Battery status.
- 🏃 Mi Fit: Launch the app and sync your smartphone. Go to Profile → Settings → Status of the device.
⚠️ Note: Xiaomi’s official apps often show averaged data and may not display real wear. For example, if the battery is swollen but the capacity has dropped by only 10%, the system may give a message Good condition. Always cross-check data with AccuBattery or an engineering menu.
4.Visual signs of battery wear
It doesn't always take software to know that the Redmi Note 8T battery is in trouble, and experienced users can identify problems by indirect signs:
| Sign. | What does it mean? | Recommendation |
|---|---|---|
| The smartphone turns off at 15-30% charge | Battery calibration knocked down or critical wear | Try calibrating (discharge to 0% and charge to 100% without interruptions) |
| The body is swollen, the screen is "stepping away" from the frame. | Battery is physically damaged | Replace the battery immediately, risk of fire! |
| Charging is jerky (1%, then 50%) | Problems with the power controller or contacts | Check the cable/adapter or contact the service |
| The phone warms up when charging. | High internal resistance of the battery | Use slow charging (5W) and avoid loads |
How to distinguish a bloated battery from a broken body?
5. Check through ADB (for advanced users)
If you're familiar with ADB (Android Debug Bridge), you can get detailed battery information through the command line, a method that's suitable for tech-savvy users.
Instructions:
- 🖥️ Install. ADB Tools on PC.
- 📱 Turn on Debugging. USB on a smartphone (Settings) → The phone. → Version. MIUI — Press 7 times, then return to the Additional Settings → For developers).
- 🔌 Connect the Redmi Note 8T The commands are: adb shell dumpsys battery
In conclusion, note:
- health – condition (2 = good, 3 = bad);
- Capacity is the current capacity.
- Voltage - voltage (normal 3.7-4.2V);
- Temperature - temperature in tenths of °C (300 = 30 °C).
Once a month |
Only when the problems start |
Never checked |
I don't know how to do that.-->
6. Battery calibration: myths and reality
Many users believe that battery calibration helps to "restore" capacity, in fact, it is a procedure for resetting the data of the power controller, which is only relevant when the percentage of charge is displayed fails.
How to calibrate correctly:
- 🔋 Discharge your smartphone before automatically shutting down.
- 🔌 Connect to the original charger and charge up to 100% without interruptions.
- 🕒 Keep charging for another 1-2 hours after reaching 100%.
- 🔄 Turn off and turn on your smartphone.
⚠️ Attention: Calibration doesn't restore a physically worn battery! If the capacity has dropped by 30% or more, no software manipulation will return it to its original values.
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Calibration helps only with a "meter failure" charge, but does not eliminate the physical wear of the battery.
7. When is it time to change the battery?
The Redmi Note 8T battery replacement is required in the following cases:
- 🔋 Wearing more than 30-40% (according to AccuBattery);
- 💥 Visible swelling of the hull;
- ⚡ Smartphone discharges in 2-3 hours without load;
- 🔌 Charging is extremely slow (for example, only 30 hours in 2 hours%);
- 🌡️ Overheating at the slightest load (temperature above 45)°C).
The cost of replacing the battery in Xiaomi service centers is 1500-2500 rubles (2026). Self-replacement is possible, but requires care: if the power controller is damaged, the smartphone may stop turning on.