Battery is the most vulnerable component of any smartphone, and Xiaomi devices are no exception. Over time, battery capacity decreases, leading to rapid discharge, sudden blackouts and charging problems. But how do you know how worn your Redmi, POCO or Mi battery is? In this article, we will examine all the current methods of verification, from built-in MIUI tools to professional utilities, which will show accurate data about the charging cycle and real capacity.
It's important to understand that even if your smartphone is less powerful than before, it doesn't always mean critical wear and tear, it may be background processes, unoptimized software, or physical damage, and we'll teach you how to distinguish between software and hardware problems, and we'll also give you some tips on how to extend battery life by 20-30% longer.
1. Check wear through the built-in MIUI menu (no root)
The easiest and safest way is to use hidden MIUI settings. It works on most Xiaomi models (including the Redmi Note 12, POCO X5, Mi 11 and later), but requires knowledge of "secret" code.
Instructions:
- 📱 Open the Phone app and go to the Keyboard tab.
- 🔢 Enter the combination: ##4636### (some firmware may not work – see alternatives below).
- 🔋 In the menu that appears, select Battery Information).
- 📊 Pay attention to the parameter Health (Health) or Capacity (Capacity).
What do indicators mean?
| Parameter | Meaning | Interpretation |
|---|---|---|
| Health | Good (OK) | Wear less than 10 percent, battery in excellent condition. |
| Health | Unknown (Unknown) | MIUI can't determine the condition. It requires an alternative method. |
| Capacity | 4000/4500 mAh | The first number is the current capacity, the second is the factory capacity. In this example, wear is ~11%. |
| Voltage | 3.8–4.4 V | Normal voltage: Values below 3.5 V or above 4.5 V are a problem. |
⚠️ Note: Some models (e.g. Redmi) 10C or POCO M4 Pro) code ##4636## may not work due to manufacturer restrictions. ADB (section 3) or third-party annexes.
2. applications for battery diagnostics (without root)
If the embedded tools don't show enough data, third-party utilities will come to the rescue. 10 Apps and selected top-3, Which are exactly what Xiaomi is doing in 2026 year.
Best programs:
- 🔧 AccuBattery shows real capacity, temperature, discharge rate and history of charging cycles. MIUI 14 and newer.
- 📊 Battery Guru – analyzes wear using an algorithm similar to smartctl for HDD. Gives a lifetime forecast.
- 🛠️ AIDA64 — Professional tool with detailed information about the battery controller and charging cycles.
How to use AccuBattery (Step-by-step):
- Download the app from Google Play.
- Open the Health tab.
- Wait for the application to collect data (may take 1-2 charging cycles).
- Pay attention to the capacity graph compared to the factory.
Example of a report from AccuBattery:
Factory capacity: 5000 mAh
Current capacity: 4250 mAh
Wear: 15% (275 cycles)
Average temperature: 32°C⚠️ Attention: Apps like CPU-Z or 3C Battery Monitor often shows inaccurate data on Xiaomi due to restrictions MIUI. Use only the proven utilities from our list.
☑️ Preparation for battery diagnosis
Advanced diagnosis via ADB (for power users)
If you want the most accurate data right from the battery controller, use Android Debug Bridge (ADB).This method works on all Xiaomi smartphones, including models with a locked bootloader.
What you need:
- 🖥️ Computer with Windows/Linux/macOS.
- 🔌 USB-cable (preferably original).
- 📦 Installed drivers ADB and Fastboot.
- 📲 Included debugging by USB on a smartphone (Settings) → The phone. → Version. MIUI → 7 times tap the assembly number → return to additional settings → For developers → Debugging by USB).
Teams to check:
adb shell
su
cat /sys/class/power_supply/battery/cycle_count # Number of charging cycles
cat /sys/class/power_supply/battery/capacity # Current capacity in %
cat /sys/class/power_supply/battery/voltage_now # Voltage in microvolts
cat /sys/class/power_supply/battery/current_now # Charge/discharge currentTranscription of results:
- cycle_count > 500 — critical wear (replacement needed).
- voltage_now < 3500000 — The battery is discharged below the safe level.
- current_now with a negative value - the phone discharges even with the connected ROM (controller malfunction is possible).
What if the ADB does not show data?
4. Engineering menu (Engineer Mode) - hidden data
The engineering menu contains detailed information about the battery that is not shown by standard settings, access to it is opened through secret codes, but be careful - wrong actions can disrupt the smartphone.
How to open the engineering menu on Xiaomi:
- Open the Phone app and type: For Qualcomm processors: ##4636## or ##36446337## For Mediatek: ##36446337## or #8255###
Hardware Testing
Battery
- Battery Voltage is voltage.
- Battery Temperature - temperature (normal: 25-45 ° C).
- Battery Health – condition (0 to 100%).
Example of data from the engineering menu for the Redmi Note 11 Pro+:
Battery Voltage: 4.32V
Battery Temperature: 38°C
Battery Health: 88% (Good)
Charging Status: Not Charging⚠️ Warning: Do not change any parameters in the engineering menu unless you are sure of their purpose! This can cause the battery to overheat or fail.
💡
If the engineering menu doesn't open, try entering codes through the Call app instead of the standard numberer.
5. Physical Diagnostics: When Software Methods Don't Help
If all of the above methods show that the battery is fine but the smartphone runs out in a few hours, the problem could be hardware.
- 🔥 The case of the smartphone heats up in the battery area even without load.
- 📉 The phone turns off at 20-30% charge and does not turn on without recharging.
- 🔌 The swelling is going to stop (it will stop).
- 💥 Visible bloating of the body (especially noticeable if you put the smartphone on a flat surface and spin).
What to do in such cases:
- Contact the Xiaomi service center for diagnostics. Replacing the battery in an authorized center will cost 1.5-3 thousand rubles (depending on the model).
- If the warranty expired, find a proven service with original batteries. The cost of the battery for the Redmi Note 10 Pro is ~ 1200-1800 rubles., for the Mi 11 Ultra - ~ 2,500-3500 rubles.
- Check the charging circuit: cable, adapter and USB-C connector. Often the problem lies in oxidized contacts.
Comparison of battery replacement costs in services:
| Model | Original battery (₽) | Analogue (₽) | Working period (cycles) |
|---|---|---|---|
| Redmi Note 12 Pro+ | 1800–2200 | 800–1200 | 500–800 |
| POCO X5 Pro | 1500–1900 | 700–1100 | 400–600 |
| Mi 13 | 2500–3000 | 1200–1800 | 600–1000 |
💡
If your smartphone is swelling, turn it off immediately and don’t use it! Lithium batteries in this state can ignite.
6.How to extend the life of a Xiaomi battery: 7 proven tips
Even if the battery wear is already 20 to 30 percent, it can slow down its development, and this is what really works (according to Battery University research and XDA Developers tests):
- 🔋 Avoid deep discharge (below 10%) and full charge (above 90%.
- ⚡ Use original or certified chargers. Cheap AliExpress RAMs often give off unstable voltages.
- 🌡️ Do not overheat (above 45)°C) and hypothermia (below 0)°C) Remove the case when charging.
- 📵 Turn it off. 5G, If you don't use it, it's a module. 5G It consumes 20-40% more energy than 4G.
- 🔄 Calibrate your battery every 3 months: discharge your phone to 0% → charge up to 100% without interruption.
- 🛠️ Update. MIUI The new firmware optimizes power management algorithms.
- 🚫 Don't use "fast charging" all the time. 10 to 18 watts is enough for everyday use.
Myths you shouldn't believe:
- ❌ "You need to discharge your phone to 0% once a month, which was true for nickel batteries 20 years ago.
- ❌ "Charging at night spoils the battery — modern smartphones automatically turn off power at 100%.
- ❌ "Battery saving apps help" - most only load the processor.