The battery is one of the most vulnerable components of a smartphone, and over time, its capacity inevitably decreases. If your Xiaomi, Redmi or POCO starts to run out faster, overheat or shut down at 20-30% charge, these are clear signs of battery wear. But how exactly do you know how tired the battery is? In this article, we will discuss 7 working ways to check the battery life, including hidden engineering menus, third-party applications and data analysis through ADB.
It's important to understand that even new smartphones can have battery problems due to defective use, misuse, or use of poor-quality chargers. Not only will we show you how to diagnose battery health, but we'll also explain which are considered normal and which are critical to replace. All methods have been tested on 2020-2026 models and work without root rights.
1. Built-in tools MIUI: «Battery status" and "Safety»
The easiest way is to use standard MIUI firmware features, which will not provide the most accurate data, like engineering codes, but will allow you to quickly assess the overall state of the battery.
To open the battery status menu:
- 📱 Go to Settings. → Battery and productivity → Battery status.
- 🔍 On some models (Xiaomi) 12/13/14, Redmi Note 11/12) The path may be different: Settings → The phone. → Battery status.
- 📊 This shows the current capacity (in mAh) and the percentage of wear (if maintained).
Starting with MIUI 13, in the Security section (Settings) → Memory. → Security may display a warning that says "Battery is worn out" if the capacity has fallen below 80% of its nominal capacity, but this method does not work on all devices, such as the battery. POCO F5 or Redmi K60 data may not be available.
⚠️ Attention: Built-in tools MIUI If the phone shows 4900 mAh at a nominal 5000 mAh, the real wear can be higher than 2-3%.
2. Engineering menu ##4636###: Hidden battery data
More accurate data can be obtained through the engineering menu, which is available on most Xiaomi smartphones without root.This method works on devices with Qualcomm Snapdragon processors (for example, Xiaomi 11T, Redmi Note 10 Pro, POCO X3 Pro).
Instructions:
- Open the Phone app.
- Enter the combination: ##4636### (some models may require ##6484###).
- Select Battery Information (Battery Information).
In this menu, pay attention to the following parameters:
- 🔋 Level - current level of charge in percentage.
- 🔌 Voltage - voltage (normal: 3.7-4.4 V at 100% charge).
- 🌡️ Temperature – Temperature (optimum: 25–40)°C).
- ⚡ Health – battery status, if any).
If you don't have a Health option, pay attention to Voltage: if it's below 4.2V at 100% charge, it may indicate wear.°C on standby.
Level parameter (charge level)
Voltage (should be 3.7-4.4 V)
Temperature temperature (norm to 40°C)
Availability of Health (Battery condition)
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3. Diagnostic applications: AccuBattery, CPU-Z and AIDA64
The application side provides more detailed information than standard MIUI tools, and let's look at three of the most reliable options.
1. AccuBattery (free, with premium features)
- 📊 Shows the real capacity of the battery (in mAh) and the percentage of wear.
- 🔄 Tracks charging cycles and discharge speed.
- ⚠️ Warnings about overheating or excessive stress.
For accurate data, the app needs 2-3 full charge/discharge cycles, and then a wear graph will appear in the Health section.
2. AIDA64 (paid but with trial period)
- 🛠️ Shows battery technology (Li-ion/Li-Po), manufacturer and date of issue.
- 📉 Displays the current capacity and nominal (for example, 4500/5000 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh).
3. CPU-Z (free)
- 🔋 Battery tab shows voltage, charge level and temperature.
- 📱 It works without the internet and does not require root.
⚠️ Note: Apps like AccuBattery can show understated capacity in the first days of use. Wait for 3-5 full charging cycles to be accurate.
| Annex | Capacity accuracy | Root is required. | Additional functions |
|---|---|---|---|
| AccuBattery | High (after calibration) | No. | Cycle tracking, temperature, voltage |
| AIDA64 | Medium | No. | Battery production date, technology |
| CPU-Z | Low (voltage only) | No. | Monitoring of temperature in real time |
4. Verification through ADB: for advanced users
If you’re ready to use a computer, ADB (Android Debug Bridge) will give you the most accurate data about the battery, a method that works on all Xiaomi smartphones, including new models like the Xiaomi 14 Ultra or Redmi K70 Pro.
Instructions:
- Download Platform Tools from Google.
- Turn on USB Debugging on your phone: Settings → About Phone → MIUI Version (click 7 times), then Settings → Additional → For Developers → Debugging over USB.
- Connect your phone to your PC and open the Command Prompt in the folder with the platform-tools.
- Enter the command: adb shell dumpsy battery
In conclusion, pay attention to the following parameters:
- Capacity is the current capacity in percent. Not to be confused with level!
- Voltage is the voltage in microvolts (divided by 1000 for volts).
- Temperature: Temperature in tenths of °C (e.g. 285 = 28.5 °C).
- Health – condition (2 = good, 3 = worn out).
If health is 3 or 7, the battery needs to be replaced, and the critical signal is a difference between capacity and level of more than 10% (for example, level = 100, and capacity = 85).
adb shell cat /sys/class/power_supply/battery/capacityIt will display the current capacity as a percentage of the nominal capacity.-->
5.Visual signs of battery wear
Even without software, you can suspect battery problems for indirect reasons.
- ⚡ Fast discharge: the phone loses 20-30% of its charge in 1-2 hours on standby.
- 🔥 Overheating: the body heats up even with minimal load (for example, in messengers).
- 📉 Nonlinear charge: charge jumps (for example, from 50% immediately to 20%) or the phone turns off at 10-15%.
- 🔌 Slow charging: full charge takes more than 3-4 hours (with a serviceable power supply).
- 💥 Bloating: screen or back cover swelled (critical! immediately turn off the device!).
If you notice bloating, don't try to keep using your phone -- it's life-threatening! Lithium-ion batteries can ignite in this state, and it's not recommended to charge the device to 100% or discharge to 0% -- it speeds up degradation.
⚠️ Attention: On models with AMOLED-screens (for example, Xiaomi 13 Pro, Redmi) K50) Fast discharge can be associated with pixel burnout. Check the screen against a monochromatic background (for example, in the Screen Test app).
6.How to check the battery on Xiaomi without a phone (by serial number)
If the phone doesn't turn on or the battery is completely drained, you can try to find out its condition by the serial number, which does not work on all models, but can help when buying a used device.
Instructions:
- Find the battery serial number (usually listed on a sticker under the lid or on a check).
- Go to the official Xiaomi checkout site.
- Enter the serial number of the device (not the battery!) and the system will show the date of production and warranty status.
Unfortunately, Xiaomi does not provide public access to the battery database, but the phone’s production date can indirectly estimate the battery age:
- 📅 1-2 years: wear up to 10-20% (normal).
- 📅 2–3 years: wear and tear of 20–40% (replacement recommended).
- 📅 Over 3 years: 40-60% wear (critical).
For accurate diagnosis, you will still need to turn on the phone for at least 5-10 minutes and use one of the methods described above.
How to find out the date of production of the battery without disassembly?
7. When it is time to change the battery: table of critical values
To understand whether a battery replacement is needed, compare the data with the following:
| Parameter | Norma. | Warning | Critical (replacement) |
|---|---|---|---|
| Capacity (from face value) | 90–100% | 80–89% | Less than 80% |
| Voltage (at 100% charge) | 4.3–4.4 B | 4.1-4.2 | Less than 4.0 B |
| Temperature in plain | 25–35°C | 36–45°C | More than 45°C |
| Autonomous time | 1.5–2 days (average load) | less than 1 day | less than 12 hours |
If your battery falls into the "Critical" column, it is recommended to replace it. Xiaomi's official service centers use original batteries with a 6-month warranty.
- 💰 Xiaomi/Redmi (battery 4000–5000 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh): 1500–2500 ₽.
- 💰 POCO or flagships (Xiaomi) 13/14): 2500–3500 ₽.
💡
If the battery capacity falls below 70% of the nominal capacity, replacing it will not only improve autonomy, but also reduce the risk of a sudden shutdown of the phone (which can lead to data loss).