Full battery check on Xiaomi Redmi: from diagnosis to replacement

Why it is important to monitor the battery status in Redmi

The battery is the only component of the Xiaomi Redmi smartphone that wears out the fastest. Even if you bought the device a year ago, the actual battery capacity could decrease by 15-20% due to cycling, overheating or using non-original chargers. Unlike the CPU or memory, battery degradation is irreversible — it can only be slowed down or compensated by replacement.

The symptoms of a “dying” battery on the Redmi Note 10 Pro, Redmi 9A or any other model in the series are often confused with software lags: the phone suddenly turns off at 30% charge, discharges overnight in standby mode or overheats during charging. But if you do not diagnose the problem in time, the consequences will be more serious: from a bloated battery (the risk of damaging the screen) to complete loss of capacity when the smartphone does not hold a charge for even 2 hours.

In this article, 5 proven ways to test the battery on Xiaomi Redmi without disassembling the device, including hidden engineering menus, third-party apps and physical tests, as well as when to run to the service center, and when you can do calibration.

Method 1: Checking with code ##4636##

The fastest method is to use Android’s hidden engineering menu, which works on all Redmi models (from 2017’s Redmi 5 to 2026’s Redmi Note 13 Pro+), but requires caution: don’t change settings unless you’re sure they’re there.

Instructions:

1. Open the Phone app.
2. Enter the combination: ##4636## (no spaces).
3. In the menu that appears, select Battery Information.

Here you will see the key parameters:

• 🔋 Level of charge (level) – current percentage in digital form (may differ from the indicator in the statusbar).
• 🌡️ Temperature - Normal: 25–40°C. If above 45°C in normal use – the battery degrades at an accelerated rate.
• ⚡ Voltage – should be within 3.7–4.2V. Values below 3.5V squash.
• 🔄 Health is the perfect indicator: Good. If Unknown or Dead, you need a replacement.

⚠️ Attention: On some firmware MIUI (especially global) the engineering menu may be blocked, in which case use alternative methods from the following sections.

💡

If the menu doesn't open, try entering the code through the Google Phone app (available on the Play Market), which bypasses MIUI's restrictions on hidden commands.

Method 2: Diagnostics through AccuBattery

AccuBattery is one of the most accurate applications for battery monitoring, it analyzes actual capacity, discharge rate, and even predicts the remaining battery life, and it works for all Redmis, including MIUI 14 models.

How to use:

1. Download AccuBattery from Play Market.
2. Charge the phone to 100% and leave it on charge for another 1 hour (for calibration).
3. Use your smartphone as usual until the charge drops to 20%.
4. Open the Health tab in the app.

What to look at in the results:

• 📊 The estimated capacity is compared to the passport capacity (for example, for the Redmi Note 11 it is 5000 mAh). If the difference is greater than 20%, the battery is critically worn out.
• 🔋 Wearing up to 15% is considered normal for batteries older than 1 year. Above 30% - it's time to think about replacing.
• ⚡ Charging/discharge speed – if the discharge in standby mode exceeds 5%/hour, check background processes or battery.

Method 3: Visual inspection and physical signs of wear and tear

Some problems with the Xiaomi Redmi battery can be detected without software, by external signs.

• 📱 Bloating – if the back cover or screen starts to “go away” and the smartphone is swinging on a flat surface, it is a sign of a bloated battery.
• 🔥 Overheating – if Redmi heats up above 45°C when simply charging or using a camera, it is a signal of degradation of the battery cells.
• ⚡ Charge jumps — for example, the phone turns off at 30 percent and then turns on at 10 percent, which indicates a calibration disorder or damage to the controller.
• 🕒 Accelerated discharge – if Redmi Note 12 with a battery of 5000 mAh discharges in 3-4 hours at an average load, the capacity fell by at least 40%.

How to check for bloating:

1. Put your smartphone on a flat table with the screen up.
2. You can press the corners of the back cover lightly, and if you feel the springy effect, the battery is swelling.
3. Put a flashlight on the junction between the screen and the body, and if you see a gap, it's proof of the problem.

⚠️ Warning: Never attempt to open a bloated battery yourself! lithium polymer batteries can release toxic gases or ignite if damaged. Contact Xiaomi Service Center or Authorized Workshop.

Method 4: Testing through ADB (for advanced users)

If you're familiar with ADB (Android Debug Bridge), you can get detailed battery information through the command line, which is suitable for all Redmis with unlocked USB debugging.

Instructions:

1. Turn on Developer Mode: Go to Settings → About Phone → MIUI version and tap 7 times.
2. Return to Settings → Additional → For developers and enable USB debugging.
3. Connect Redmi to the PC, install it ADB-Drivers and open the terminal.
4. Enter the command: adb shell dumpsy battery

Key parameters in the conclusion:

• Level is the current charge in percentage.
• Voltage - voltage (normal: 3700-4200 mV).
• Temperature is a temperature in tenths of a degree (for example, 320 = 32.0°C).
• Health: 2 (good), 3 (bad).
• Capacity – Current capacity (if supported).

Example of output for a serviceable Redmi 10C battery:

level: 85




voltage: 4050




temperature: 290




health: 2




capacity: 4800

⚠️ Note: If the health setting is 3 (or 6 on some firmware), it means a critical battery condition.

Install ADB drivers on PC| Enable USB debugging on Redmi| Connect your phone with the original cable | Run the command line on behalf of the administrator-->

Method 5: Checking through the Testing Menu (CIT)

Xiaomi hides a special CIT (Factory Test Mode) menu in MIUI firmware, where you can check not only the battery, but also other components, a method that works on most Redmis, but may not be available on some global versions.

How to open CIT:

1. Open the Phone app.
2. Enter the code ##248### (for new models) or ##6484## (for older models).
3. Choose Battery Test or Battery Test.

In the test menu you will see:

• 📊 Real capacity (in mAh) - compare with passport.
• 🔄 Number of charging cycles – if more than 500, the battery is close to wear.
• ⚡ Charging status – if not charging is indicated when the cable is connected, the problem is in the controller or port.

On some models (like the Redmi Note 11 Pro), the CIT has a battery stress test that discharges and charges the battery in an accelerated mode to detect instability. Don't run it unnecessarily, which shortens battery life.

💡

The CIT menu is the most accurate way to check, as it uses data directly from the battery controller, rather than the Android OS score.

When to change the battery: checklist for a decision

It's not always low autonomy that means the battery is out of order, sometimes it's the firmware, the background software, or the faulty charger, and here's a checklist to help you determine if you need a replacement.

The phone turns off at 20-30% charge|Capacity on AccuBattery is below 60% of the passport|The battery is swelling (visually visible)|Temperatures are over 45.°C when charging|Battery life has been reduced by 2+ once-->

If at least 2 items from the list above fit your situation, it's time to think about replacing. Pay attention to the official Xiaomi service centers - they use original batteries with a guarantee.

Tip: If you buy a battery yourself (like on AliExpress), check for a protection controller and a Xiaomi hologram.Fake batteries often don't have overheat protection and can be dangerous.

FAQ: Frequent questions about Xiaomi Redmi battery