Checking the battery Xiaomi Redmi Note 8 Pro: from condition to wear

Battery is one of the most vulnerable areas in the Xiaomi Redmi Note 8 Pro, especially after 2-3 years of active use. Decreasing battery life, sudden shutdowns at 20-30% charge or slow charging are all signals that the battery requires diagnosis.

In this article, we will discuss 5 working methods of checking, from standard MIUI tools to hidden engineering menus and professional applications, how to measure real capacity, wear and even battery temperature during operation, and why the performance in smartphone settings is often overestimated by 10-15% and how to get accurate data.

1. Check through the standard MIUI menu

The easiest way is to use the built-in MIUI tools, which will not provide detailed technical information, but will help to assess the overall condition of the battery and identify obvious problems.

Go to Settings → Battery and Performance → Battery status. Here you can see:

• 🔋 Percentage charge level (updated in real time).
• ⚡ Battery temperature – normal range: 25–40°C. Exceeding 45°C signals overheating.
• 📊 Intake schedule for the last 24 hours (helps to identify abnormal consumption).

Note the Battery Use section – if there are apps with a consumption of >10% in the background (like Facebook or Telegram), they can artificially reduce the time of operation.

⚠️ Attention: B MIUI 12 and later, the actual battery capacity is hidden. The 100 percent setting is a software estimate, not the actual cell state.

2. Engineering menu: hidden data about the battery

For a deep diagnosis, use the Engineering Mode, which contains raw data from the battery controller, including voltage, charge/discharge current, and real capacity.

How to open it:

1. Open the Phone app.
2. Enter the combination: ##4636###.
3. Select the Battery Information item.

In this menu, pay attention to:

• 📏 Level - current charge in percentage (may differ from the current charge) MIUI on 1-3%).
• ⚡ Voltage: voltage. Normal: 3.7-4.2 V. Below 3.5 V is a critical discharge.
• 🔥 Temperature - temperature in degrees Celsius (more precisely than in MIUI).
• 🔄 Health is the battery state. Perfect: Good. If Unknown or Dead, you need a replacement.

Voltage - should be 3.7-4.2 V

Temperature - not higher than 45 ° C

The state (Health) is only "Good"

Charge Current – when charging 1.5–2.0 A

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If the Health item is missing, your version of MIUI is blocking it, in which case move on to the next method.

3. Diagnostic applications: AccuBattery and AIDA64

Standard MIUI tools provide limited information. For detailed analysis, use third-party tools:

AccuBattery (recommended)

The app tracks charge cycles, real capacity and wear rate, and after 2-3 full charge/discharge cycles, it will show:

• 📉 A battery health score (e.g., "85% of original capacity").
• 🔌 Charge current – if it is below 1.0 A, check the cable or adapter.
• ⏱ Time to complete discharge at current consumption.

AIDA64 (for technical data)

Go to the Battery section.

• 🔢 Battery serial number (helps verify authenticity).
• 📊 Real-time voltage graph.
• 🔋 Technology (Li-Po) for Redmi Note 8 Pro).

⚠️ Note: If AccuBattery has less than 80% of its original battery capacity (4,500 mAh for the Redmi Note 8 Pro), this is critical wear.

4. Verification through ADB: controller

For advanced users, there is a way to get raw data from the battery controller via ADB (Android Debug Bridge), the most accurate method, but requires a connection to a PC.

Instructions:

1. Enable USB Debugging in Settings → About Phone → MIUI version (click 7 times, then go back to Additional Settings → For Developers).
2. Connect your smartphone to your PC and execute the command: adb shell dumpsys battery
3. Level: 78 voltage: 3850 temperature: 340 (divided by 10 → 34.0°C) health: 2 (2=Good, 3=Overheat, 4=Dead)

The advantage of this method is that it doesn't have any software distortions, for example, if the MIUI is 15 percent charge, and the ADB is level: 5, the battery is actually discharged to a critical level.

5. Visual examination and multimeter test

If the software methods show a critical problem, check the battery physically.

Step 1: Visual inspection (if you are disassembling your smartphone):

• 🔍 Check if there is swelling - if the battery case is deformed, it must be replaced urgently.
• 🔥 Look for traces of oxidation on contacts (green or white plaque).
• 📏 Measure the thickness – if it exceeds 8mm (normal for the Redmi Note 8 Pro), the battery swells.

Step 2: Multimeter Verification (for experienced users):

1. Turn the battery off the charge.
2. Connect the multimeter probes to the + and - contacts.
3. Measure the voltage: 🔋 3.7–4.2 B - Normality. 🔋 3.0–3.6 B - deep discharge (requires charging). 🔋 <2.8 B - Battery dead (not restored).

⚠️ Warning: Disassembling your smartphone will void your warranty. If you're not sure about your skills, contact your service center. If your battery is blown up, you can't puncture or compress it, you can't risk fire!

💡

If the battery is swelling but the smartphone is still working, don't delay replacement. Lithium cells can ignite if mechanically damaged. Use the device until replaced only in a ventilated room, don't leave it unattended on charging.

6. When is it time to change the battery?

Even if the battery looks normal, it should be replaced with the following symptoms:

• 🔌 The smartphone is running out of power. 50% post 2-3 hourly.
• ⚡ Charging is interrupted (for example, stops at 80% and does not go further).
• 🔥 Overheating during charging (temperature above 50)°C).
• 📉 AccuBattery has a capacity of less than 2000 mAh (originally 4500 mAh).
• 🛑 Sudden shutdowns when 20-30% charge.

The average battery life of the Redmi Note 8 Pro is 2-3 years (or 500-800 charge cycles). If your battery is older, the probability of wear and tear is greater than 70%.

💡

The original battery for the Redmi Note 8 Pro is marked BM47 (4500 mAh). Buy only from official suppliers - cheap analogues are 2-3 times smaller and can swell in a month.

FAQ: Frequent questions about the Redmi Note battery 8 Pro