How to find out the real state of the battery on Xiaomi Redmi Note 8T: all ways

The battery is one of the most vulnerable parts of the smartphone, and the Xiaomi Redmi Note 8T is no exception. After 1-2 years of active use, many owners notice that the battery goes down faster, the phone overheats when charging or suddenly turns off by 20-30%. The reasons can be different from natural wear and tear to malfunction of the power controller. But how exactly to know what condition the battery of your Redmi Note 8T is in?

In this article, we'll look at all the validation tools available, from built-in MIUI tools to third-party applications and engineering codes, how to interpret capacity, charging cycles and battery health, and what to do if data indicates a critical state. Importantly, some methods require unlocking the bootloader or root rights, but we'll start with the simplest and safest options.

1. Check through the standard MIUI menu

The fastest way to assess battery health is to use MIUI tools built in, which don't give you accurate technical data, but they show you a general picture of wear and energy consumption.

Open Settings → Battery and performance → Battery status. Here you will see:

• 📊 Wear level (if supported by your version) MIUI). For example, the label “Good condition” means that the battery capacity has decreased by no more than 10-15%.
• ⚡ Last charging cycle – how long has it been since you connected to the network.
• 🔋 Estimated operating time – the estimated duration of operation at the current charge level (but these data are often overstated).

Note that some Redmi Note 8T firmware may not have a Battery Status section, depending on the version of MIUI (e.g. global firmware has it, Chinese firmware doesn't). If you don't have this item, move on to the next method.

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If the battery status menu displays a "Replace battery" warning, it means that its capacity has dropped below 60-70% of the original.

2. Hidden engineering codes for diagnostics

Xiaomi smartphones support special service codes that allow you to get advanced information about the battery, these codes work without root rights, but require input through the standard Phone application.

Open the Phone app and enter one of the following codes:

• 🔢 ##4636## — opens the Testing menu. Go to Battery information tab. Here you will see: Level Voltage — the norm for the Redmi Note. 8T 3.7-4.2 B) Temperature (optimally 25-40°C) Technology (Technology - should be Li-ion)
• 🔢 ##6484## - Hardware test, Battery will show the actual percentage of wear (if supported).

⚠️ Note: Not all codes work on custom firmware or after updates MIUI. If nothing happens after entering the code, try another method.

3. Applications for detailed diagnostics

If the built-in MIUI tools don't provide enough information, you can use third-party apps to show real capacity, number of charging cycles, and even current consumption.

The best apps for the Redmi Note 8T:

• 📱 AccuBattery analyzes battery health, shows wear and recommends optimal charging levels.The free version has limitations, but they are enough for basic diagnostics.
• 🔋 Battery Guru - displays voltage, temperature and discharge history. Suitable for real-time monitoring.
• 🛠️ AIDA64 — provides the most detailed information, including the battery serial number, production date and current capacity in mAh.

To get accurate data in AIDA64, open the app, go to the Battery section and pay attention to:

• Health status is a percentage of the original capacity.
• Current Capacity – should be close to 4000 mAh (original capacity of the Redmi Note 8T).
• Charge cycles: If more than 500, the battery is close to being replaced.

Health status (Health)|Current Capacity (Capacity)|Voltage (Voltage)|Temperature (Temperature)|Number of cycles (Charge cycles)-->

4. Check through ADB (for advanced users)

If you're ready to use the command line, the ADB method will give you the most accurate data. It doesn't require root rights, but you'll need a computer and Xiaomi drivers installed.

Instructions:

1. Download and install Platform Tools (includes adb.exe).
2. Turn on the phone to Debug via USB (Settings → About Phone → MIUI version – press 7 times, then go back to Settings → Additional → For Developers).
3. Connect the Redmi Note 8T to your computer and execute:

adb shell


dumpsys battery

In conclusion, note:

• Health is the battery state (2 means “good”).
• Capacity is the current capacity in percentage.
• Voltage - voltage (should be within 3.7-4.2 V).
• Temperature is a temperature in tenths of a degree (e.g. 285 = 28.5°C).

⚠️ Note: If the health parameter shows 3 (bad condition) or 7 (unknown condition), this may indicate a malfunction of the power controller or the battery itself.

5. Visual inspection and physical signs of wear

Sometimes you can evaluate the battery without software, by external signs.

If you notice a bloating battery, stop using your phone immediately. The billowing battery can damage the display or even ignite. In such cases, it is recommended to contact an authorized Xiaomi service center for replacement.

6. Battery calibration: when and how to do

If the phone shows an incorrect percentage of charge (for example, jumps sharply from 50% to 20%), the problem may be in the wrong calibration.

How to Calibrate the Battery on the Redmi Note 8T

1. Discharge the phone before automatically switching off (0%).
2. Connect the original charger and charge for at least 3 hours after reaching 100%.
3. Turn off the network, turn off the phone for 5 minutes, then turn it on.
4. Repeat the cycle 2-3 times.

⚠️ Note: Calibration will not help if the battery is physically worn out (capacity below 70%).In such cases, replacement is required. Also, do not use "fast charging" during calibration - this can distort the results.

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Calibration of the battery only helps with software failures, but does not restore physically worn cells. If after calibration problems remain, check the battery for wear.

7. When is it time to change the battery?

Even when used with care, the Redmi Note 8T battery loses capacity over time, and here are the criteria for replacing it:

• 📉 Capacity below 60% of the original (less than 2400 mAh).
• ⏳ Working hours were halved (for example, instead of 8-10 hours, 3-4 hours).
• 🔥 Overheating during charging or during calls.
• ⚡ Unstable charge (phone shuts down for 20-30%).
• 🛠️ Bloating of the body (even minor).

Cost of battery replacement at Xiaomi service center (2026):

• Original battery: 1500-2500 rubles (depending on the region).
• Analogue (quality): 800-1200 rubles.
• Self-replacement: 500-1000 rubles (but you risk losing the warranty).

If you're going to replace your battery yourself, use only certified components, and cheap ones can not only fail quickly, but also damage the motherboard.

FAQ: Frequent questions about the Redmi Note battery 8T