The battery is one of the most vulnerable components of Xiaomi’s smartphone, which gradually degrades even when used carefully. After 1-2 years of active use, the battery capacity can decrease by 20-30%, leading to rapid discharge, sudden shutdowns and charging problems.
In this article, we will look at all the diagnostic tools available, from built-in MIUI tools to third-party applications and engineering codes, how to interpret wear indicators, which values are considered normal and which require intervention, and focus on the Redmi Note, POCO and Xiaomi 13/14 flagships, where diagnostic algorithms may differ.
Important: battery health depends not only on the number of charging cycles, but also on operating conditions. Overheating, use of non-original chargers and deep discharges accelerate degradation. On Xiaomi smartphones with fast charging support (33W/67W/120W), battery wear can occur 10-15% faster than on models with standard 18W charging.
1. Check through the hidden menu ##4636##
The easiest way to assess battery health is to use the Android engineering menu, which is available on most Xiaomi smartphones, including the Redmi Note 12, POCO X5 and Xiaomi 13 Lite, but can be blocked on some MIUI firmware for the European region.
Instructions:
- Open the Phone app.
- Enter the combination: ##4636## (no spaces).
- In the menu that appears, select Battery Information.
Here you will see the key parameters:
- 🔋 Level of charge (level) – current percentage in digital form.
- 🔌 Status: must be Charging (charged) or Discharging (discharged).
- 🔥 Temperature – normal values: 25–40°C. Exceeding 45°C critically!
- ⚡ Voltage – should be within 3.7–4.2V Li-Pol batteries.
⚠️ Note: Some Xiaomi models (e.g. Redmi) 10C or POCO M4 Pro) the engineering menu may not display capacity data, in which case use alternative methods from the following sections.
If the menu does not open, try:
- 📱 Delete * and # characters when entering (some firmware works just 4636).
- 🔄 Reboot your smartphone and try again.
- 📲 Install Activity Launcher (available on Google Play) and run Testing through it → Battery information.
2.Using the built-in MIUI (Security App) diagnostics
MIUI has a built-in battery checker tool, but it's hidden in the Security app.This method works on most Xiaomi smartphones released after 2020, including the Redmi Note 11, POCO F4 and Xiaomi 12T.
Step-by-step:
- Open the Security app (the shield icon).
- Go to the Optimization section.
- Click on the icon. ⚡ Battery at the top of the screen.
- Select Battery Health or Diagnostics.
This section will show:
- 📊 Current capacity as a percentage of the original capacity (e.g. 88% means 12 times wear and tear%).
- 🔄 Number of charging cycles (norm: up to 500 cycles for Li-Pol batteries).
- ⚡ Recommendations for extending the service life (for example, avoiding overheating).
| Capacity index | Battery status | Recommendations |
|---|---|---|
| 90–100% | Excellent. | Continue to use as normal |
| 80–89% | Good. | Watch the temperature, avoid deep discharges |
| 70–79% | Satisfactory | Consider replacing them within 6 months |
| Less than 70% | Critical | Battery replacement is required |
⚠️ Attention: On some firmware MIUI Global Battery Status may not be available, in which case update the Security app via Google Play or use the method with the following: ADB (section).
Make sure your smartphone is at least 20 times charged%|
Close all background applications |
Connect to a stable Wi-Fi network (to download data) |
Use the original charger (if you check while charging)
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Third-party applications: AccuBattery and AIDA64
If the built-in MIUI tools don't show enough data, use specialized applications. We recommend AccuBattery and AIDA64 - they provide detailed information about wear, temperature and discharge rate.
AccuBattery (free, with premium options):
- 📉 Tracks the real battery capacity in mAh (compared to passport).
- 🔄 Shows the number of charging cycles and the average temperature.
- ⚡ Analyzes the charging / discharging speed by application.
How to use:
- Install AccuBattery from Google Play.
- Charge your smartphone to 100% and discharge to 20% (calibration).
- Go to the Health tab – the current capacity in percentage will be displayed here.
AIDA64 (paid version with trial period):
- 🔧 Shows accurate data from the battery controller (voltage, temperature, technology).
- 📊 Contains a history of battery life.
- 🛠️ Supports battery performance testing.
Warning: Some applications (such as CPU-Z) may show incorrect capacity data on Xiaomi smartphones due to MIUI limitations.
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If AccuBattery is below 80%, but your smartphone is stable, try resetting the statistics in your app settings and recalibrating, and sometimes the data is distorted by controller errors.
4. Verification through ADB (for power users)
The Android Debug Bridge (ADB) method is suitable for advanced users who want to get the most accurate data directly from the battery controller, which works on all Xiaomi models, including the Redmi K50 and Xiaomi 13 Ultra.
What you need:
- 🖥️ Computer with installed ADB-driver.
- 📱 Included debugging by USB smartphone.
- 🔌 Original. USB-cable (better from the set).
Instructions:
- Activate Developer Mode: Go to Settings → About Phone and click on MIUI Version 7 times.
- Return to Settings → Additional → For developers and enable USB debugging.
- Connect your smartphone to your PC and confirm the debugging permission.
- Open the command line (Windows) or terminal (macOS/Linux) and type:
adb shell
dumpsys batteryIn the conclusion, find the lines:
- health: 2 - battery status (2 = good, 3 = overheating, 4 = dead).
- Capacity: 3800 - current capacity in mAh (compare with passport).
- voltage: 4 — voltage, 4000 m = 4V).
⚠️ Attention: Teams ADB It may vary depending on the version MIUI. On some firmware for POCO Instead of dumpsys battery, use cat. /sys/class/power_supply/battery/capacity.
What if the ADB does not recognize the device?
5.Visual signs of battery wear
Even without special tools, you can suspect problems with the battery for indirect reasons.
- 🔋 Fast discharge: the smartphone loses 20-30% of charge in 1-2 hours in standby mode.
- ⚡ Unstable charging: the percentage of charge jumps (for example, from 50% to 20% per second).
- 🔥 Overheating: the body heats up even with minimal load (especially in the battery area).
- 🛑 Sudden shutdowns: the phone turns off at 10-20% charge.
- 🔌 Slow charging: full charge takes more than 3-4 hours (with a serviceable power supply).
If you see at least 2-3 signs on the list, the probability of battery wear is more than 70%. on Xiaomi models with support for fast charging (67W/120W), symptoms may appear earlier due to increased battery load.
Example: on the Redmi Note 11 Pro+ with a battery of 4500 mAh at a wear of 25%, the active time is reduced from 8-9 hours to 4-5 hours. On flagships (Xiaomi 13 Pro), the difference is less noticeable due to the optimization of MIUI.
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If the smartphone is turned off at 15-20% charge, this is a sign of desynchronization of the battery controller, calibration (full charge-discharge cycle) or battery replacement will help.
6. When is it time to change the battery?
Replacement of the battery is recommended in the following cases:
- 📉 Capacity below 70% of the original (according to diagnostic data).
- 🔥 Battery temperature exceeds 45°C in normal mode.
- 🛑 The smartphone is turned off at 30% charge and above.
- 🔌 Charging time increased by more than 50% (for example, from 1.5 to 3 hours).
The cost of replacing the battery in Xiaomi service centers:
| Smartphone model | Cost (rupe) | Time to change |
|---|---|---|
| Redmi Note 10/11/12 | 1 500–2 500 | 30-60 minutes |
| POCO X3/X4/X5 | 2 000–3 000 | 40-90 minutes |
| Xiaomi 11/12/13 | 3 000–5 000 | 60–120 minutes |
| Xiaomi 13 Ultra / Mix Fold | 5 000–8 000 | 2-3 hours |
Tip: When replacing a battery, choose original Xiaomi-branded batteries or certified counterparts (such as ATL or Sunwoda) cheap non-original batteries can have a capacity 20-30% lower than stated and fail faster.
7. How to extend the life of the battery on Xiaomi?
Compliance with simple rules will help slow down the degradation of the battery:
- 🔌 Avoid deep discharges: charge your smartphone at 15-20% charge.
- ⚡ Don’t keep on charging all night: turn off after 100% (or use the Optimized Charging feature in the app). MIUI).
- 🔥 Control the temperature: Do not use your smartphone when charging in a hot room.
- 📵 Turn it off. 5G/LTE, If the signal is weak (constant network search drains the battery).
- 🔄 Calibrate the battery once every 3 months: fully discharge and charge the smartphone.
On models with fast charging (67W/120W) it is recommended:
- Use original power supplies (unoriginal ones can damage the controller).
- Enable Settings → Battery → Optimized charging (limits charge to 80%).
- Avoid charging at high temperatures (such as in the sun or near a heater).
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Xiaomi smartphones with MIUI 14+ have a hidden function Adaptive Charging. To activate it, type in the engineering menu (#4636##) the command testing adaptive charging on.