How to check the status of the battery on Xiaomi Redmi: from wear to temperature

Why it’s important to monitor your Redmi battery and how to do it right

The battery is the most vulnerable component of any Xiaomi Redmi smartphone, and its degradation is inevitable. 12 or POCO X5 Keeps the charge "as new", the real wear can reach 30-40% through 2 The problem is that the system tends to hide the critical state of the battery until it suddenly shuts down or bloats.

In this article - 7 proven ways to diagnose a battery, from standard tools MIUI You'll learn how to read hidden data about real capacity, the number of charging cycles, even the temperature peaks that shorten life, and how to distinguish software wear and tear from physical battery damage so you don't waste money on replacement.

Important: The methods work on all Redmi models (including Redmi) 10/11/12, Note 9/10/11 Pro), POCO (series X/F/M) even the old Mis. A1/A2. But for accurate data, you need an unlocked bootloader or root access - we will also talk about this.

Method 1: Integrated diagnostics in MIUI (no-apps)

The easiest way to do this is to use a hidden menu. MIUI, It's not going to give you any details, but it's going to help you estimate the overall wear and tear.

Instructions:

1. Open the Phone app.
2. Enter the combination: ##4636###.
3. In the menu that appears, select Battery Information.

What you'll see:

• 🔋 Charge level – current percentage (may differ from the indicator in the statusbar).
• 🌡️ Temperature - normal up to 40°C, above 45°C - critical overheating.
• ⚡ Voltage - should be in the range of 3.7–4.4V (Li-Pol batteries).
• 📊 The wording “good” does not mean no wear!

⚠️ Warning: If you see Unknown instead of data in this menu, it means that the battery controller is damaged or the firmware has been modified.

Method 2: Codes for engineering menus (advanced data)

For deep diagnostics, use engineering codes that show real capacity, number of charging cycles, even overheating history. POCO (Other than Chinese models with blocked codes).

Major teams:

#2840## - Battery test (shows voltage and temperature in real time)
#36446337## - Information about the battery and controller version
#4636## → “Battery Information” → “Show More Information”

What to look for in the results:

On the Redmi Note 10 Pro and newer, the ##2840## code may not work – use the app instead CIT (built-in MIUI To test. Path: Settings → The phone. → All specifications → 5 times to tap on the "core".

Charge your phone to at least 30%

Disable all applications in the background

Record the factory battery capacity (indicated on the sticker under the lid)

Use the original cable for accurate readings-->

Method 3: Diagnostic applications (AccuBattery, CPU-Z, and others)

The side of the utility provides more data than standard tools MIUI. The best of them:

• 📊 AccuBattery shows real wear, discharging rate and cycle history. minus: requires calibration (2-3 full charge cycles).
• 🔍 CPU-Z — Battery tab displays temperature, tension and health (Health).
• 🛠️ AIDA64 — It's the most detailed app, but it's hard for beginners, and it even shows the date of the battery production.
• 📉 Battery Guru – monitors degradation in real time and predicts the remaining lifespan.

How to use AccuBattery:

1. Install the app and allow access to battery data.
2. Charge your phone to 100% and wait for the automatic test.
3. Check the Health tab - the option Design capacity will show real wear.

An example of decryption of data from AIDA64:

• Design Capacity – factory capacity (e.g., 5020 mAh for Redmi Note 11 Pro)+).
• Full Charge Capacity – current capacity (if 3800 mAh – wear and tear) ~25%).
• Charge Cycles – the number of full cycles (over 600 – a reason to replace).

⚠️ Note: If in AccuBattery or AIDA64 You see the value of Unknown instead of capacity, so the battery controller doesn't support reading data.

Method 4: Checking through ADB (for advanced users)

If the engineering codes don’t work and the applications show inaccurate data, use the code. ADB (Android Debug Bridge: This method gives access to raw data from the battery controller, including hidden settings.

Instructions:

1. Install ADB Tools on your PC.
2. Turn on the debugging. USB on the phone (Settings) → The phone. → Version. MIUI → 7 times to tap → return to additional settings → For developers).
3. Connect Redmi to your PC and execute commands:

adb shell


dumpsys battery

Key parameters in the conclusion:

• health - state (2 = good, 3 = overheating, 4 = dead battery).
• Capacity - current capacity in mAh (compare with factory capacity).
• Voltage - voltage (should be) ~4.2V 100% charge).
• Technology is a type of battery (should be Li-poly).

For models on Qualcomm Snapdragon (e.g. Redmi) K50 or POCO F4) Extended team available:

adb shell dumpsys batterystats

It will show the history of discharge and peak loads that shorten the service life.

💡

If ADB does not recognize the device, try updating drivers through the Mi Flash Tool or using the original USB-Cheap cables often don't transmit debugging data.

Method 5: Visual inspection and physical signs of wear and tear

Even without software, you can detect battery problems by looking at the outside.

• 📏 Bloating – if the Redmi back cover starts to bend or there are gaps between the screen and the frame, the battery requires immediate replacement.
• 🔥 Overheating – if the phone is over 45°C with a simple charge (check through) AIDA64).
• ⚡ Sudden shutdowns – even at 30-40% of the charge (indicates a voltage drawdown).
• 🕒 Accelerated discharge – if the Redmi Note 9 Pro with a capacity of 5020 mAh holds a charge of less than 6-8 hours with moderate use.

How to check for bloating:

1. Place your phone on a flat surface (such as a table).
2. Lightly press the center of the back cover – if it “plays” or bends, the battery is swollen.
3. Light a flashlight on the side - if there is a gap between the lid and the case, this is 100% a sign of bloating.

⚠️ Attention: A bloated battery is a fire hazard. Don't try to charge or disassemble it yourself. On a non-removable Redmi (e.g. Redmi 10) it requires a special dryer and disassembly experience to replace it.

On older models (Redmi) 4X, Redmi 5A) Removable cover - you can carefully remove the battery and inspect it for the subject:

• Bloating (normal battery is flat, without bulges).
• Oxidation of contacts (green or white coating).
• Damage to the shell (cracks, punctures).

Method 6: Test under load (battery stress test)

To identify hidden problems, run a load test that shows how the battery behaves at peak currents.

Instructions:

1. Charge the phone to 100%.
2. Run a resource-intensive app (such as Genshin Impact or Call of Duty Mobile).
3. Open AccuBattery or CPU-Z and watch:

• 📉 Discharge rate is 10% per hour. Over 15% - critical wear.
• 🌡️ Temperature - if above 50°C, the battery degrades at an accelerated rate.
• ⚡ Power drawdowns – if the phone turns off at 20–30% charge, the controller will flounder.

For objectivity, repeat the test 2-3 times. If the discharge occurs unevenly (for example, from 100% to 80% in 10 minutes, and then slowly), this is a sign:

• Charging controller malfunction.
• Poor contact between battery and board.
• Severe wear of cells (typical for batteries older than 3 years).

💡

If the phone runs 1% in 3-5 minutes on standby (screen is off, background apps are closed), the problem is not the battery, but the software. Try resetting to factory settings or reflashing the device.

Method 7: Check the charging controller (if the battery is "not visible")

If the phone doesn’t detect the battery (Unknown in settings) or shows 0% charge when connected to a charge, the problem may be:

• 🔌 Power controller (machine chip on the motherboard).
• 🔋 Damaged battery plume (frequent problem after falls).
• 🔄 Firmware failure (for example, after a failed update) MIUI).

How to diagnose:

1. Connect your phone to charge and check if the current is running: adb shell dumpsys battery | grep "AC powered" If the result is false, the controller will not recognize the charger.
2. Check the voltage on the battery contacts with a multimeter (should be ~3.7V battery-free).
3. Try to boot up in Fastboot (Loudness Down). + Power supply – if there is a phone sees charging, the problem is the firmware.

Typical Controller Faults on Redmi:

⚠️ Warning: If you suspect a controller malfunction, do not use wireless charging (on models like the Redmi). K50 or POCO X4 A damaged controller can cause overheating and fire.

What to do if the battery is worn out: replace or repair?

If the diagnosis showed wear over 30%, you have 3 options:

• 🔄 Calibration -- sometimes it helps with software wear:

1. Discharge the phone before automatically shutting down.
2. Charge up to 100% without interruptions (use the original adapter).
3. Repeat 2-3 times.

❌ When calibration is useless:

• Physical battery bloating.
• Capacity below 60% of the factory.
• The phone turns off at 20-30% charge.

If the calibration didn't work, you need to replace the battery.

• 💰 Original battery: 1500–3000 ₽ (model-wise).
• 💰 Analogue (quality): 800–1500 ₽.
• 💰 Replacement in service: 500–1500 ₽ (detailless).

Where to buy a battery:

• 🛒 Xiaomi’s official services are 6 months’ warranty, but expensive.
• 🛒 AliExpress – Look for sellers with a 98 rating%+ Compatibility with your model.
• 🛒 Local shops are cheaper, but the risk of running into a fake.

⚠️ How to Avoid Cheating When Buying:

• Make sure that the battery has a sticker with the date of production (not older than 6 months).
• Compare the capacity with the original (for example, for the Redmi Note 11 Pro)+ — 4500mAh).
• Pay attention to the contacts – they should be clean, without oxidation.

💡

Don't skimp on battery! Cheap analogues (price below 500) ₽) often have a real capacity of 20-30% less than the declared and can swell after 3-6 months.

FAQ: Frequent questions about Xiaomi Redmi battery