How to know exactly the status of the battery on the Xiaomi smartphone: from hidden codes to ADB-team

The battery is the most vulnerable component of a smartphone that degrades even when used correctly. On Xiaomi devices (including the Redmi and POCO sub-brands), checking the battery is complicated by the lack of built-in tools in MIUI. However, there are hidden methods to get accurate data on the real capacity, the number of charging cycles and even the temperature characteristics of the battery.

In this article, you will find unique ways to diagnose Xiaomi battery, which are not limited to standard applications from Google Play. USSD-codes, what ADB-The teams give you the most complete information, and how to interpret the data from the logs of the system. MIUI 14/15 and new smartphones on Qualcomm Snapdragon/MediaTek, Where traditional methods may not work.

1. Check through the engineering menu (#4636##)

The fastest way to get basic battery information is to use a hidden engineering menu, which works on most Xiaomi devices, but can be blocked on some models with MIUI Global.

Instructions:

• 📱 Open the phone app and enter the combination: ##4636##
• 🔋 In the menu that opens, select Battery Information)
• 📊 Pay attention to the parameters: Level - current charge in % Voltage - voltage (normal: 3.7–4.4V) Temperature - temperature (critically above 45)°C)

⚠️ Attention: On some firmware MIUI This menu may be missing or incomplete. If nothing happens after you enter the code, move on to the next method.

Detailed diagnosis via ADB (for advanced users)

The Android Debug Bridge (ADB) method provides the most complete information, including the actual battery capacity and the number of charging cycles, and requires a smartphone to be connected to a PC.

Steps:

1. Install. ADB-computer-driver
2. Enable USB Debugging in Settings → About Phone → MIUI Version (click 7 times, then go back to Additional Settings → For Developers)
3. Connect your smartphone to your PC and perform at the terminal:

adb shell


dumpsys battery

In conclusion, note:

• 🔋 Capacity - current charge (%)
• 🔌 voltage - voltage)
• 🔄 charge_counter — Real capacity in mkAh (compare with passport)
• 🌡️ temperature (°C)

Install ADB-PC drivers

Enable debugging over USB on Xiaomi

Connect your phone to the original cable

Start the command line on behalf of the administrator-->

💡 Example of decryption: If your Redmi Note 11 passport-capable 5000 mAh, ah. charge_counter show 3500000 μAh (3500 mAh), so the battery is worn out 30%.

3. Battery monitoring applications (with caution!)

Google Play has hundreds of battery-testing apps, but 90% of them show inaccurate data or require root rights. We tested 15 programs and selected 3 that actually work on Xiaomi:

⚠️ Note: Applications without root rights (like AccuBattery) measure wear indirectly by discharging time and cycle number, and their data may differ from the real ones by 10-20%. ADB ore-menu.

💡

If the app shows “Data Wait” after installing AccuBattery, charge the phone to 100% and discharge to 15% – this calibrates monitoring.

4. Testing through test mode (##6484##)

Some Xiaomi models (especially Redmi and POCO on MediaTek processors) have a hidden test mode that shows the real state of the battery, including the number of charging cycles.

Instructions:

1. Open the phone app and type in: ##6484###
2. Select Battery Test (also known as MBAT Test)
3. Note: Battery Health – battery health (%) Charge Cycles – number of full Full Capacity charging cycles – current maximum capacity (compare with passport)

📌 Important: This method does not work on all devices. If after entering the code, a message appears Connection problem or invalid MMI code, so your model doesn't support this test.

5. Analysis of system logs (for technically savvy)

Xiaomi system logs contain detailed battery information, but they are difficult to read without special knowledge.

Steps:

1. Install MatLog from Google Play
2. Open it and select the filter: battery or healthd
3. Find the lines with: capacity: - current voltage charge: - voltage temp: - temperature charge_full: — real-time maximum capacity

🔍 Example of a log:

05-20 12:34:56.789  1234  5678 Healthd   : battery l=85 v=4023 t=34.0 h=2 tech=Li-ion st=2 c=3500 chg=u


05-20 12:35:01.123 1234 5678 Healthd: charge_full: 4200000 (μAh) = 4200 mAh]

In this example, it is clear that the passport capacity 5000 MACh is the actual maximum capacity (charge_full) form 4200 mAh - wear and tear 16%.

💡

System logs are the most reliable source of battery data, but they require filtering skills, charge_full.

Physical diagnosis (visual signs of wear)

If software methods are not available, pay attention to indirect signs of battery wear:

• 🔋 Fast discharge: The phone discharges in 3-4 hours with moderate use (a sign of capacity loss of 40%+)
• 🔌 Uneven charging: Charge jumps (for example, from 80% to 100% at once) – a sign of damage to the controller
• 🌡️ Overheating: Phone heats up above 45°C when charging or playing
• 📱 Bloating: The screen or back cover is swollen (critical case – replace the battery immediately!)

⚠️ Warning: If the battery is swelling, don't try to puncture or bend it, it could cause fire.Take the phone to a Xiaomi service center or an authorized workshop.

7.How to extend the life of Xiaomi battery: 5 proven ways

Even if your battery is in good condition, the following tips will help slow down its degradation:

• 🔌 Avoid full discharge: Charge your phone at 15-20%, don't go to 0%. = 1 wear cycle
• ☀️ Do not charge in the heat: The optimal charging temperature is 10–30°In the sun or in the car in the summer, the battery degrades 2-3 times faster
• 🔋 Use the original charging: Fast charging Xiaomi (33W/67W/120W) Safe, but cheap Chinese charging is ruining the battery 6–12 months
• 📵 Turn off background processes: Apps like Facebook or TikTok drain the battery even in the background. Use Settings → Battery → Optimization
• 🔄 Calibrate the battery once every 3 months: Completely discharge the phone before turning off, then charge up to 100% without interruptions

💡 Advice for owners POCO: In models POCO F3/F4/F5 There is a hidden Battery Care Mode feature that limits the charge to 80% to extend the service life. Included through the settings → Battery → Battery settings.

FAQ: Frequent questions about Xiaomi battery