The battery is one of the most vulnerable components of a smartphone, and over time, its capacity decreases and battery life decreases. If your Xiaomi, Redmi or POCO starts to run out too quickly, the first thing to do is check the current battery capacity, which will help you determine whether you need a replacement or if you need enough calibration.
In this article, we will analyze all available ways to check the capacity of the battery - from built-in tools. MIUI You'll learn how to interpret metrics, what "charging cycles" are, when it's really time to change batteries, and why data from different sources can vary. 10-15% And what is the most accurate method.
1. Testing capacity through MIUI settings (official method)
The easiest and safest method is to use the built-in MIUI diagnostics.It works on most modern Xiaomi devices (starting with MIUI 12) and does not require root rights or additional programs.
Instructions:
- 📱 Open the Settings. → Battery and productivity
- 🔍 Slap the icon. ⚙️ ("Battery settings”) in upper right corner
- 📊 Select Battery Status (on some models - Battery Diagnostics)
Here you'll see two key parameters: Current capacity (in mAh) and Percentage of Wear. For example, if the battery was originally at 5,000 mAh, and now it's 4200 mAh, that means 16% wear. Redmi Note 11 Pro+ with a factory capacity of 4,500 mAh at 3,800 mAh already needs attention.
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If the Battery Status item is not on the menu, upgrade your MIUI to the latest version or use alternative methods from this article.
2. Engineering menu: secret codes for Xiaomi
For advanced users, there's a way through the engineering menu that gives more detail, but it requires caution that wrong actions can disrupt the system.
Enter one of the codes in the Phone application:
- 🔢 ##4636## - General testing (section "Battery Information")
- 🔢 ##6484## - detailed battery diagnostics (not working on all models)
- 🔢 ##64663## - Alternative code for verification POCO F3, Xiaomi 11T)
In the menu that opens, pay attention to:
Battery Health (Battery Health in %)
- battery capacity (current capacity in mAh)
Voltage (voltage, should be 3.7-4.4V when fully charged)
What to do if the code doesn't work?
⚠️ Warning: Do not change the parameters in the engineering menu unless you understand their values. This can lead to overheating of the battery or incorrect indication of charge.
3. Third-party diagnostic applications
If the built-in tools don't show capacity or you want to get more data, use specialized utilities. We tested 5 popular applications and selected the most accurate ones:
| Annex | precision | Requires root. | Additional functions |
|---|---|---|---|
| AccuBattery | 92% | ❌ No. | Monitoring of charging cycles, temperature, discharge speed |
| CPU-Z | 85% | ❌ No. | Shows voltage, battery technology (Li-Po/Li-Ion) |
| Battery Guru | 88% | ❌ No. | Forecast of working time, history of charging |
| AIDA64 | 95% | ✅ For complete data | Detailed information about the charging controller |
Recommendation: Install AccuBattery and use it for 2-3 days to collect statistics. The app will show not only the current capacity, but also the real “health” of the battery, taking into account the charging cycles. For example, on the Xiaomi Mi 10T after 500 cycles, the capacity can fall from 5000 mAh to 3500 mAh – this is critical wear.
4. Verification through ADB (for power users)
The method for those who are willing to connect a smartphone to a computer, it gives the most accurate data, but requires the installation of ADB Tools and the activation of debugging over USB.
Step-by-step:
- Turn on Developer Mode (7 times tap the MIUI version in your phone settings)
- Activate Debugging by USB in the Developer Menu
- Connect your phone to your PC and execute the command: adb shell dumpsys battery
In the conclusion, find the lines:
- Capacity - current charge in %
- Voltage - voltage
- Technology - battery type
Health – state (GOOD (2) to DEAD (7)
Install ADB Tools on PC|
Enable the developer mode on Xiaomi|
Activate debugging via USB|
Connect the original USB-cable|
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⚠️ Note: If the health parameter shows COLD (4) or OVERHEAT (3), immediately stop using the device - this is a sign of a malfunction of the battery or controller.
Physical inspection (disassembly of the device)
This method is only suitable for users with experience in disassembling smartphones, and the battery always shows its rated capacity (for example, 4500mAh 3.85V), but over time, the real numbers decrease.
What you'll need:
- Plastic blade for opening the body
Multimeter (to check the voltage)
Alcohol and napkins (to clean contacts)
Algorithm:
1. Turn off the phone and remove the tray for SIM-map.
2. Heat the back cover with a hair dryer (60–70°C) to soften the glue.
3. Gently tuck the lid with a spatula, starting at the corner next to the power button.
4. disconnect the battery plume and remove the indicators with a multimeter.
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If the battery voltage is below 3.0V at 0% charge or above 4.4V at 100%, this is a sign of deep wear or malfunction of the charging controller.
6. How to interpret the results of the audit
And if you get the capacity data, compare it to the factory parameters of your model, and here's the approximate wear rate.
- 🟢 0-10% battery in excellent condition (for example, 4950 mAh out of 5000 mAh)
- 🟡 10-30% - noticeably reduced working time, but the replacement is not critical (4200 mAh out of 5000 mAh)
- 🔴 30-50% – Replacement required in the near future (3500 mAh out of 5000 mAh)
- ⚫ 50%+ — Battery is dangerous to use (risk of bloating or sudden shutdown)
Examples for popular models:
- Xiaomi Redmi Note 10 Pro: factory capacity 5020 mAh → at 3800 mAh (24% wear) the operating time is reduced by 30-40%
- POCO X3 Pro: 5160 mAh → at 4000 mAh (22% wear) problems with fast charging begin
- Xiaomi 12 Pro: 4600 mAh → at 3500 mAh (24% wear) possible random reboot
7. Battery calibration: Can capacity be restored?
If the wear is not critical (up to 20%), try calibration, a process that resets the charging controller data and helps to map the battery level more accurately.
Instructions for MIUI:
1. Completely discharge the phone before turning off.
2. Connect the original RAM and charge continuously for 8-12 hours.
3. Turn off the power, turn off the phone for 5 minutes, then turn it on.
4. Repeat the cycle 2-3 times.
To speed up the process, use the Battery Calibration app (requires root). After calibration, the capacity in the settings can show +5-10% - this is not battery recovery, but adjustment of the controller readings.
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Calibration only helps with software failures. If the battery is physically worn out (blown, loss of capacity), calibration is useless and needs to be replaced.
8 When is the time to change the battery?
In addition to reducing the capacity, there are other signs of critical wear:
- 🔥 Phone warms up when charging (above 45)°C)
- ⚡ Battery discharges by 20-30% per night in standby mode
- 📉 The operating time was reduced by half compared to the new device
- 💥 The body is swelling (check if the phone is on the table)
- ⚡ Charging is interrupted or is jerky (problems with the controller)
The cost of replacing the battery in the service center Xiaomi:
- Redmi 9A/9C: 1200–1500 ₽
- POCO X3/X4: 1800–2200 ₽
- Xiaomi 11/12 series: 2500–3500 ₽
- Xiaomi 13/14 Pro: 3800–4500 ₽
⚠️ Warning: When replacing a battery, always check whether the original battery (with the Xiaomi logo and hologram) or the equivalent will be installed. Non-original batteries often have 10-15% less capacity and may not support fast charging.