How to check the battery quality on Xiaomi phone: step-by-step instructions with tests and norms

The battery is one of the most vulnerable components of a smartphone, and Xiaomi is no exception. Even if your Redmi, POCO or Mi looks like new, the battery could lose up to 30% of its capacity in 2-3 years of active use. The problems are different: the phone runs out in a few hours, turns off at 20-30% charge or overheats during charging. But how exactly to determine the state of the battery without disassembling the device?

In this article, you will find 7 proven ways to diagnose a Xiaomi battery, from hidden engineering codes to professional applications. We will also look at the wear standards for lithium polymer batteries (they are different from the myths on the Internet!) and give recommendations on how to extend the life of the battery. If after checking it, the capacity has fallen below the critical level, there is a checklist of actions at the end of the article.

The fastest way to get data about the battery is to use a hidden engineering menu, which is available on all Xiaomi smartphones (including Redmi Note 10/11/12, POCO X3/X4/X5, Mi 11/12/13) without installing third-party apps.

Instructions:

📱 Open the phone app and enter the combination: ##4636##.
🔍 In the menu that appears, select Battery Information (or Battery Information).
📊 Note the parameters: Level (Level) – current percentage; Status – must be Charging/Discharge or Charging/Discharging; Temperature (Temperature) - the norm 25–40°C; Voltage - optimally 3.7–4.2 Technology - must be Li-polymer (lithium-polymer).

⚠️ Note: If the menu displays Unknown instead of data or the temperature is higher than 45°C in normal use is a sign of a malfunction of the battery or power controller, in which case a diagnosis is required at the service center.

📊 How often do you check the battery status on your smartphone?

Once a month

Only when the problems start.

Never checked.

I don't know how to do that.

Code ##6484## - Test of battery and hardware components

This code runs an extended MIUI Test menu, where you can check not only the battery, but also other components of the smartphone.Works on most Xiaomi models, except for some budget lines (for example, the Redmi A1/A2).

How to use:

Open the Phone app and type ##6484##.
From the MBT (Mobile Battery Test) menu, select Battery.
The system will show: 🔋 Capacity – Compare with the passport capacity of your model; 🔄 Charge Cycles – the larger, the stronger the wear; ⚡ Charging Current – must correspond to the declared (for example, 33W For the Redmi Note 12 Pro+).

💡 Tip: If the battery capacity is less than 80% of the factory capacity (for example, 3,500 mAh instead of 5000 mAh), it is time to replace it. At 60% or lower, the smartphone can turn off at the slightest load.

💡

If the ##6484## code doesn't work, try entering it through the Airplane Room Dial app, and some firmwares block the engineering codes when the Internet is active.

3.AccumBattery application - detailed wear analysis

AccuBattery is one of the most accurate battery monitoring apps out there, and it not only shows your current capacity, but it also calculates your residual life based on your charging habits. It's free (with ads), but there's a big nuance for Xiaomi: you need permission to access battery statistics.

How to set up:

📥 Install AccuBattery from Google Play.
🔧 Go to Settings. → Annexes → Permits → Battery statistics and enable access for AccuBattery.
📊 After 2-3 charging/discharge cycles, the application will show: Real capacity (compared to passport); Wear in percent; Health score (excellent to critical); Discharge rate in mAh/hour.

⚠️ Note: AccuBattery can show low capacity values in the first days of use. AccuBattery requires at least 5 full charge cycles (from 0 to 100%) for accurate data).

Battery status	Factory container	Signs.	Recommendations
Excellent.	90–100%	Fast charging, stable operation	Continue to use as usual
Good.	80–89%	Moderate wear, charge is kept 10-15% less	Watch the temperature, avoid full discharge.
Satisfactory	60–79%	Fast discharge, the phone turns off at 15-20%	Prepare to replace, reduce the load
Bad.	40–59%	Charge lasts 2-3 hours, overheating	Battery replacement is required
Critical	Less than 40%	The phone does not turn on or off immediately after the charging is turned off.	Urgent replacement! Risk of damage to the fee

4. Check through MIUI Battery Care (for new models)

Starting with MIUI 13 and later (e.g. Xiaomi 13/13T, Redmi Note 12), the system has a Battery Care feature that automatically limits the charge to 80% to extend the battery life.

How to find it:

Go to Settings → Battery and Performance.
Put it on the icon. ⚙️ (gear) in upper right corner.
Choose Battery Care (Battery Care).
The system will show the battery status and recommendations.

🔹 Important: If this menu displays the message "Battery requires maintenance", it means that the capacity has fallen below 70% of the factory. On new models (Xiaomi 14, Redmi Turbo 3), the system can even offer to sign up for diagnostics in the official service.

What if Battery Care does not show the battery status?

On some firmware (especially global ones), the feature is hidden. Try: 1. Update MIUI to the latest version. 2. Switch to India in settings (Settings → Additional → Region). 3. Use alternative methods from this article.

5. Test through ADB (for advanced users)

If the engineering codes and applications don't give you the full picture, you can get the battery data through the ADB (Android Debug Bridge), which requires you to connect the phone to a computer, but it shows hidden parameters, such as the charging cycle counter and the real voltage of the cells.

Instructions:

🖥️ Install. ADB Tools on PC.
📱 Turn on Debugging. USB on the phone (Settings) → The phone. → Version. MIUI → 7 times tap the version → return to → For developers).
🔌 Connect your phone to your PC and type in the command line: adb shell dumpsys battery
📋 Look for the lines: capacity: - current capacity; voltage: - voltage; temperature: - temperature; charge counter: - charge counter (in μA·h).

⚠️ Note: If the charge counter value is very different from the passport capacity (for example, 2500000 instead of 5000000 for 5000 mAh), this confirms critical wear. ADB You can reset the battery calibration data by the team:

adb shell dumpsys batterystats --reset

But it will not restore capacity, but only reset statistics!

Install ADB on PC| Enable USB debugging on phone | Connect original cable | Check connection with adb devices | Run dumpsys battery-->

6. Visual Diagnostics: When to Disassemble a Phone

If software methods show critical wear and tear, but you doubt the results, you can check the battery visually. This is true for phones older than 3 years or after falling/getting moisture. Warning: disassembling the phone will void the warranty (if it is still valid)!

What to look out for:

🔍 Bloating: if the battery is swelling (even a little), it must be replaced urgently - it is dangerous to health!
🔥 Traces of oxidation: green or white plaque on the contacts indicates moisture ingress.
🧲 Label detachment: If the factory sticker on the battery is moving away, it's a sign of overheating.
📏 Deformation: A normal battery should be flat, without bumps.

📌 How to safely remove the battery:

Turn off the phone and remove it. SIM-map.
Use a plastic shoulder blade or mediator to plug the lid (start at the corner near the power button).
Carefully disconnect the battery plume (usually it is glued and closed with black tape).
Don’t pull the wires – they can come off!

⚠️ Warning: If the battery is swelling, do not puncture it - it can lead to fire! Also do not use metal tools when disassembling, so as not to close contacts.

💡

Visual inspection is the most reliable way to detect physical damage to a battery, but it requires caution, and if you're not sure about your skills, you should contact the service.

7. Xiaomi Online Services: Official Diagnostics

If you don’t want to disassemble your phone or install third-party apps, you can use Xiaomi’s official diagnostics service, which is available for most models and shows not only battery status but other hardware issues as well.

How to check:

Go to the Xiaomi Diagnose website (works only for authorized devices).
Enter your phone’s IMEI (you can find it in Settings → About Phone → General Information).
Follow the instructions on the screen (scanning may be required) QR-code).
The system will generate a report with a battery rating (from Excellent to Requires Replacement).

🔹 Pros of the method:

✅ Official data from Xiaomi;
✅ It does not require disassembly or installation of software;
✅ Can be used for warranty repairs.

🔸 Cons:

❌ It doesn't work on unofficial firmware;
❌ For some regions (such as Russia) it may be necessary to VPN;
❌ Data is updated every 1-2 months (not real time).

What to do if the battery is worn out?

If the test shows that the battery capacity has dropped below 70% and the phone runs out in a few hours, it's time to take action.

Check warranty (if the phone is under 1-2 years old)|Reset to factory settings (sometimes helps with software failures)|Limit background application activity |Use power saving mode |Refer to the service to replace the battery-->

🔧 Replacement: If you have decided to replace the battery yourself, consider:

🛠️ Buy the original battery (the article can be found on the old battery or on the Xiaomi website).
🔋 For adhesive batteries (for example, in Xiaomi) 12/13) will require isopropyl alcohol or special glue.
⚡ After replacement, be sure to calibrate the battery: completely discharge the phone, then charge to 100% without interruptions.

💰 Cost of replacement:

In the official service Xiaomi: 1,500-4000 ₽ (model-wise);
In informal workshops: 800–2,500 ₽ (risk of poor-quality battery);
Independently: 500–1,500 ₽ (battery + tool).

⚠️ After replacing the battery in the unofficial service may be missing the signal network or stop working NFC. This is because some Xiaomi models have a battery tied to the motherboard, which requires firmware. IMEI.

FAQ: Frequent questions about Xiaomi battery

🔋 How often should you calibrate your battery on Xiaomi?

Calibration (full discharge/charging cycle) is recommended every 2-3 months, which helps the power controller to determine the level of charge more accurately, but on new smartphones (with MIUI 12 and later), the system itself corrects the readings, so frequent calibration is not necessary.

⚡ Why Xiaomi is 100% charger, but shuts down immediately?

This is a sign of a battery wear or a controller failure. Reasons: Capacity has dropped below 60% of the factory capacity; Power Controller gives incorrect data (reset via ADB); Charging connector or battery plume is damaged. First check the battery through AccuBattery or engineering menus. If the capacity is critically low, only replacement.

🔥 Can you use Xiaomi with a bloated battery?

Absolutely not! A bloated battery can: Damage the screen or motherboard; emit toxic gases; explode when heated (for example, while charging); If the battery swells even a little, stop using the phone and replace it in the service.

📉 Why Xiaomi’s battery will run out faster in winter?

Lithium polymer batteries lose capacity in the cold. At temperatures below 0°C: Capacity temporarily decreases by 20–30%; Internal resistance increases, which speeds up discharge; False shutdowns may occur (the phone turns off at 30–40% charge); Solution: keep the phone warm (like in your inner pocket) and avoid charging in the cold.

🔄 How many charging cycles can Xiaomi battery withstand?

Average life of a lithium polymer battery: 300–500 cycles to 20% capacity loss (when charging from 0 to 100%); 800–1000 cycles to 20% capacity loss (when charging in the range of 20–80%). In practice, the Xiaomi battery lasts 2-3 years when used actively. To extend its life, avoid: Full discharge (0%); Overheating (do not play games while charging); Use of low-quality chargers.