The battery is one of the most vulnerable components of a smartphone, and Xiaomi is no exception. Over time, battery capacity decreases, leading to rapid discharge, sudden blackouts and charging problems. But how do you know that the battery is really worn out, not the fault of firmware or background processes? In this article, we will examine all the available diagnostic methods, from standard MIUI tools to hidden engineering menus and third-party applications.
It is important to consider that battery performance depends not only on the number of charging cycles, but also on operating conditions. For example, constant charging at high temperatures (above 35 ° C) accelerates the degradation of lithium-ion cells by 2-3 times, so checking the condition of the battery should be a regular procedure - especially if your Redmi, POCO or Mi has already served more than a year.
1. Check through the standard MIUI menu: what the system shows
The easiest way to assess battery health is to look at smartphone settings. Xiaomi provides basic information about battery health, but these data are often superficial and do not reflect real wear and tear.
To open up the statistics:
- Go to Settings → Battery and Performance.
- Slap the gear icon (⚙️) top-right.
- Select the Battery Status.
Here you will see two key parameters:
- 🔋 Current capacity – shows how much charge the battery can hold compared to factory norm (e.g. 3800 mAh out of 4,000 mAh).
- ⚡ Charging cycles – the number of full discharges / charges (normal – up to 500 cycles for modern batteries).
But it's not always accurate. For example, on some POCO F3 or Redmi Note 10 Pro models, the system can show 100% health even if the actual capacity has dropped by 15-20%, so alternative diagnostics are needed for deep diagnostics.
2. Hidden USSD-battery-diagnostic
Xiaomi hides several service codes that allow you to get advanced information about the battery without root rights. These commands work on most models, including the Mi 11, Redmi Note 12 and POCO X5.
Enter the following combinations in the Phone application:
- 📱 ##4636## – opens the Testing menu, where you can see the charge level, temperature, voltage and charging technology (for example, Quick Charge 3.0) in the Battery Information section).
- 🔢 ##6484## - alternative code for checking the status of the battery (does not work on all firmware).
- 🔋 ##64663## – displays detailed information about the power module, including the battery serial number and production date.
Note the health parameter in the ##4636## menu.
- Good – battery in perfect condition (less than 10% wear).
- Unknown – the system cannot determine the state (often on custom firmware).
- Dead or Replace soon - critical wear and tear, need replacement.
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If nothing happens after entering the code, try dialing it in the Emergency Call app or restart your smartphone.
3. Engineering menu (MTK/Qualcomm): diagnostics
For Xiaomi owners on Qualcomm processors (for example, Snapdragon 8 Gen 2 in Xiaomi 13) or MediaTek (for example, Helio G96 in Redmi Note 11), an engineering menu with detailed information about the battery is available.
Instructions for Qualcomm:
- Enter the code ##36446337## or #3644633##.
- Go to the Battery Information section.
- Pay attention to the parameters: 📊 Battery Capacity (mAh) – The Real Capacity. 🌡️ Battery Temperature - Temperature (normal: 20-40)°C). ⚡ Voltage (mV) – voltage (normal: 3700-4200 mV at 100% charge).
For MediaTek, use the code ##54298## or ##36446337###, then go to Battery.
⚠️ Note: Do not change the parameters in the engineering menu unless you are sure of their purpose. For example, resetting the battery calibration (Battery Calibration) can lead to incorrect display of the percentage of charge.
What to do if the engineering menu is not opened?
4 Third-party applications: AccuBattery, CPU-Z and others
If standard methods don't give you the full picture, third-party utilities come to the rescue, and they analyze sensor data and plot wear, temperature and discharge rates.
Top.-3 applications for diagnostics of battery on Xiaomi:
- 📊 AccuBattery – shows real capacity, wear in percentage and predicts the remaining lifespan. Feature: takes into account the depth of discharge (recommended to keep the charge in the range of 20-80% to extend the life of the battery).
- 🔧 CPU-Z — The Battery section displays voltage, temperature and charging technology, useful for comparison with passport data.
- 📈 Battery Guru monitors charging cycles and warns of overheating, supports widgets for quick access to statistics.
Example of data from AccuBattery for Xiaomi 12T after a year of use:
| Parameter | Meaning | Norma. |
|---|---|---|
| Real capacity. | 4200mAh | 5000mAh (factory) |
| Wearing | 16% | Up to 20% is acceptable. |
| Average temperature | 32°C | Up to 40°C. |
| Charging cycles | 312 | Up to 500. |
⚠️ Attention: Some applications (e.g, 3C Battery Monitor requires root rights to read data accurately, without which the numbers can be approximate.
1. Charge your smartphone to 100%
2. Calibrate the battery (discharge to 0% and charge without interruption)
3. Close all background applications
4.Use the original charging block-->
Hardware inspection: multimeter and visual inspection
If software methods don't give a definitive answer, you can resort to physical diagnostics, which is true if the smartphone suddenly turns off, does not hold a charge or the body is swollen.
What you need:
- 🔌 Multimeter (for voltage measurement).
- 🔍 Loop or flashlight (to inspect the battery).
- 🛠️ Plastic blade (for neat opening of the body).
Step-by-step:
- Turn off your smartphone and remove the back cover (on removable battery models, such as the Redmi 4A).
- Examine the battery for bloating, corrosion, or damage to contacts.
- Connect the multimeter to the contacts of the battery (red probe to +, black to -).
- Compare the readings to the norm: 🔋 3.7-4.2 V is the norm for a lithium-ion battery. Less than 3.4 V is a deep discharge, requires charging with a special device. 0 V - the battery is completely discharged or defective.
If the voltage is below 3.6 V and the smartphone is not turned on, try to "resuscitate" the battery with a frog (external charger) or contact the service center. Remember: a bloated battery is dangerous - it can ignite when mechanically exposed.
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If the battery is swelling, DO NOT try to charge or puncture it. Remove the battery immediately (if possible) and dispose of it at a special reception point.
6.When it's time to change the battery: signs of critical wear
Even if the diagnosis shows wear and tear of 15-20%, this is not always a reason to replace, but there are clear signs that the battery requires intervention:
Disturbing symptoms:
- ⚡ Smartphone discharges by 50% in 1-2 hours without active use.
- 🔌 Charging is interrupted or is jerked (for example, jumps the percentage from 80% to 50%).
- 🔥 The body heats up in the battery area even under light load.
- 📉 Apps like AccuBattery show wear over 30%.
- 🚫 The device turns off at 20-30% charge (calibration failure).
The cost of replacing batteries in Xiaomi varies from 1,500 to 5,000 rubles depending on the model:
- Redmi Note 10/11 – ~ 2000 rubles.
- POCO X3/X4 – ~2,500 rubles.
- Xiaomi 12/13 – ~4000 rubles.
Official service centers use original batteries, but their price is 20-30% higher than that of third-party workshops.
⚠️ Attention: Cheap analogues of batteries (for example, for 800-1000 rubles) often have an understated capacity and can damage the power controller!
7.How to extend the life of a battery: 5 rules for owners of Xiaomi
Even if your battery is still in good condition, following simple guidelines will help delay replacement by 1-2 years.
What to do:
- 🔄 Avoid full discharge (0%) and recharge (100%). Optimal range is 20–80%.
- 🌡️ Do not use your smartphone in the cold (below -10)°C) or in heat (above 35)°C).
- 🔌 Turn off fast charging if you don't rush (it heats up the battery).
- 📵 Close unused applications, especially those with active geolocation (e.g. Google Maps, Yandex.Navigator).
- 🔋 Calibrate once every 3 months: discharge the phone before turning off, then charge to 100% without interruptions.
What not to do:
- ❌ Use non-original chargers (especially those with power above 30W for models that do not support such charging).
- ❌ Leave your smartphone on charge all night long.
- ❌ Ignore updates MIUI — They often optimize energy consumption.
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Starting with MIUI 14, Xiaomi added the "Adaptive Charging" feature, which automatically limits the charge to 80% at night. → Battery → Additionally.