Battery is one of the most vulnerable components of a smartphone, and over time, its capacity inevitably decreases. On Xiaomi, Redmi and POCO devices, you can check the real state of the battery in several ways: from built-in tools to specialized applications and even commands through ADB. But why is this important? A degraded battery not only reduces the time of operation, but can cause sudden shutdowns, overheating or even bloating the case.
In this article you will find 5 proven diagnostic methods โ from the simplest (through secret codes) to advanced (using an engineering menu). We will also look at what is considered normal for Xiaomi batteries of different ages, and what to do if the capacity has fallen below the critical level.+ mAh โ for them, the wear threshold of 20% can mean a loss of 800+ mAh of real capacity.
1. Checking through secret code ##4636##
The fastest way to get basic battery information is to use Androidโs engineering menu, which works on most Xiaomi smartphones without root rights or additional apps.
Instructions:
- ๐ฑ Open the phone application (call).
- ๐ข Enter the combination: ##4636##.
- ๐ In the menu that opens, select Battery Information).
- ๐ Note the parameters: Level is the current percentage; Status is either Charging or Discharging; Health is the perfect Good; Temperature is the 25-40 norm.ยฐC.
โ ๏ธ Note: Some Xiaomi models (e.g. Redmi Note 10 Pro) POCO F3) This code can be blocked, in which case use alternative methods from the following sections.
2.Use of the AccuBattery application
AccuBattery (available on Google Play) is one of the most accurate tools for monitoring battery health, analyzing charging cycles, measuring actual capacity, and predicting wear and tear.
How to use:
- Install and open AccuBattery.
- Connect your smartphone to charging and wait 100% (the application will collect data on the charging speed).
- Go to the Health tab. It'll show up here: ๐ Design capacity (e.g. 3800 mAh instead of the stated 4500 mAh). ๐ Percentage of wear (norm to 15-20% for 2-3 years of operation). ๐ Graph of degradation for the entire period of use.
๐ก Use at least 3-5 charge cycles for accurate data. AccuBattery takes into account temperature, voltage and current, making its results more reliable than one-time tests.
โ๏ธ Preparation for the test in AccuBattery
3. Diagnostics via ADB (for advanced users)
If you want the most accurate data right from the system, you can use ADB (Android Debug Bridge), which requires connecting your smartphone to your PC, but gives you access to hidden battery settings that don't show the apps.
Step-by-step:
- Install. ADB-pc-tool.
- Turn on "Debugging by" USBยป on a smartphone: Settings โ The phone. โ Version. MIUI (Press 7 times to activate the developer mode) โ Settings โ Additionally. โ For developers โ Debugging by USB.
- Connect your phone to your PC and type in the command line: adb shell dumpsys battery
- Look for lines: health: 2 (Good) - battery state capacity: 85 - current capacity in % voltage: 4123 - voltage in mV temperature: 300 - temperature in tenths of ยฐC (30.0 ยฐC)
โ ๏ธ Attention: Capacity parameter in ADB It shows the current charge, not the wear and tear. To find out the actual capacity, compare the discharge time with the new battery or use data from the data from the data from the new battery. /sys/class/power_supply/battery/charge_full (root).
How to know the wear through charge_full?
Checking through the MIUI Engineering Menu (CIT)
Xiaomi hides advanced battery tests in the CIT (Certificate of Inspection Test) menu, which works on most models but may require activation through service codes.
How to open CIT:
- ๐ Call: ##6484## or #64663##.
- ๐ง Select "Battery" from the menu (may be called "Battery") MBAT Test or Battery Test).
- ๐ Look at the parameters: ๐ Battery Voltage - voltage (normal 3.7-4.2 V). ๐ก๏ธ Battery Temp - Temperature. โก Charging Status โ Charging Status.
๐ Key conclusion: On the menu CIT And you often have a Battery Aging Test, which shows you how much you wear, and if you don't, you should notice the voltage, and you should be 100 percent charged. ~4.2 V at 50% โ ~3.8 B. Severe deviations indicate degradation.
Analysis of working time and comparison with the standard
If you don't have access to technical tools, you can estimate battery health empirically, by battery life, and compare the current performance with the model benchmarks.
A rough table of norms for popular Xiaomi smartphones (with an average load: social networks, messengers, 4G):
| Model | Capacity (mAh) | Standard operating time (new battery) | Critical wear (less than 50% autonomy) |
|---|---|---|---|
| Redmi Note 10 Pro | 5020 | 1.5โ2 days | less than 10-12 hours |
| POCO F3 | 4520 | 1-1.5 days | less than 8-10 hours |
| Xiaomi 12 Pro | 4600 | 1 day | less than 6-8 hours |
| Redmi 9A | 5000 | 2.5 days | less than 12-15 hours |
๐ How to test:
- ๐ Charge your phone to 100% and disconnect from the network.
- ๐ต Enable In-Air mode (to eliminate network impact).
- ๐ฎ Launch a video on YouTube in 1080p 50% brightness.
- โฑ๏ธ Take the time to full discharge, and if it's less than 60 to 70 percent of the reference, the battery is very worn out.
What to do if the battery is worn out?
If the diagnosis shows wear and tear of more than 30-40%, the battery should be replaced.
- ๐ง Official replacement: Contact Xiaomi Service Center (new battery warranty 6-12 months) Cost: 1500-4000 โฝ model-wise.
- ๐ ๏ธ Self-replacement: Buy the original battery (for example, for the Redmi Note 11 โ art. MB0F) And follow the video instructions. โ ๏ธ Risk of damage to plumes!
- โก Temporary measures: Turn off fast charging in settings. Use a dark theme and turn down the brightness. Charge your phone to 80% (reduces wear and tear).
โ ๏ธ Warning: If the battery is swelling (the body of the smartphone is curved), immediately stop using it! Li-ion batteries that are blazing can ignite. Don't try to pierce or compress them, dispose of them at special reception points.