Xiaomi Redmi battery test: from hidden codes to professional tests

Battery is the most vulnerable part of any smartphone, and Xiaomi Redmi is no exception. Over time, the battery loses capacity, the phone starts to run out in an hour, or even turn off at 30% charge. But how do you know that the problem is in the battery, not a software failure or background of running applications? In this article, we will analyze all the available methods of verification, from standard MIUI tools to engineering menus and third-party utilities that will show the real state of the battery.

Important: The methods work on all Redmi series models (including Redmi Note 12/13, Redmi 10/11, Redmi A2, etc.), but some features may not be available in budget versions or on custom firmware. If your phone runs out too quickly, don’t rush to blame the battery – first rule out software reasons (viruses, background processes, unoptimized software).

We will also tell you what are considered critical for battery replacement (for example, a drop in capacity below 70% of nominal value or internal resistance above 200 mOhm), and what to do if the smartphone does not hold a charge even after calibration. MIUI.

1. Check through the Battery Status menu in MIUI

The fastest way to get basic information is to use the standard MIUI menu, which shows the current battery wear, temperature and screen life, but does not give detailed data on capacity or internal resistance, but it is enough for an initial diagnosis.

To open the menu:

1. Go to Settings → Battery and Performance.
2. Slip on the Battery Status icon (or Battery Health in newer versions of MIUI).
3. Wait for the data to load – the system will analyze the charging cycles and the current capacity.

In this menu, pay attention to:

• 🔋 Status assessment: If you say "Good" or "Normal," battery is fine. "Bad" or "Replace" - signal to action.
• 📊 Capacity: Compare it to face value (for example, for the Redmi Note 11 it is 5000 mAh.
• 🌡️ Temperature: normal - 25-40°C. If above 45°C in normal use, the battery degrades at an accelerated rate.

Limitation: MIUI doesn't always show accurate capacity, especially on older models. Other tools will be needed for deep diagnostics.

2. Hidden engineering codes for diagnostics

Xiaomi smartphones support service USSD-codes that give access to hidden menus with detailed battery information, which are root-free, but some may require SIM-Important: Don't enter codes at random, it can cause a phone malfunction.

Basic codes for checking the battery:

How to use the codes:

1. Open the Phone app and enter the code as a number.
2. You'll see a tabbed menu on the screen. Select Battery Information (or similar).
3. Note the Voltage (norm: 3.7-4.2 V), Temperature and Capacity settings.

⚠️ Note: Code ##6484## may not work on new Redmi models with Snapdragon processors.

If the codes don’t work, try entering them through the Symbols app (included in the standard set). MIUI). Also check if your operator is blocking them – some codes only work with the user. SIM-MTS or Beeline.

Voltage (normal: 3.8-4.2 V at 100% charge)

Temperature (critically above 45°C)

Real capacity (compared to passport)

Battery technology (must be Li-ion or Li-Po)

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3. Applications for deep diagnostics

Standard MIUI tools and engineering codes provide limited information, and third-party applications are better at accurately estimating wear, analyzing charging cycles, current capacity, and even predicting the remaining battery life.

Top.-3 Applications for Xiaomi Redmi:

• 📱 AccuBattery (free, premium): shows real capacity, wear, temperature and charging history. Minus - requires calibration (you need to fully discharge and charge the phone 1-2 times).
• 🔍 CPU-Z (Battery tab: displays voltage, technology, charge level and temperature. Suitable for quick check.
• 🛠️ AIDA64 (Pay version: the most detailed application, shows Health (battery health), Wear level (wear and tear level), Charge cycles (charging cycles).

How to use AccuBattery:

1. Install the app from Google Play and give you access to the battery data.
2. Charge your phone to 100% and wait for the app to collect data (it can take 1-2 cycles).
3. Check the Health tab for real wear and tear (e.g., Design capacity: 5000 mAh, Estimated capacity: 4200 mAh).

Example of data decryption from AccuBattery:

• Design capacity - passport capacity (indicated on the battery).
• Estimated capacity - current capacity (if less than 80% of the nominal value - the battery is worn out).
• Wear level – percentage of wear (critically above 30%).

⚠️ Note: Some apps (such as Battery Guru) may show inaccurate data on Xiaomi due to restrictions MIUI. For accuracy, use AccuBattery or AIDA64.

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If the app shows a 0 mAh capacity or a read error, restart the phone and repeat the test, sometimes turning off the power saving mode for the app itself.

Checking through a computer (ADB and specialized software)

For advanced users, there's a way to get battery data through ADB (Android Debug Bridge), which requires you to connect your phone to a PC, but it gives you access to raw data from the power controller that doesn't show the apps.

What you need:

• 🖥️ Computer with installed ADB-Drivers (download from Xiaomi website or via the SDK Platform Tools).
• 📱 Included debugging by USB on the phone (in Settings) → The phone. → Version. MIUI Tap 7 times, then return to the Additional Settings → For developers).
• 🔌 Cable USB Type-C (preferably original).

Instructions:

1. Connect your phone to your PC and open the command prompt (cmd) in the folder with adb.exe.
2. Enter the command to check the status of the battery: adb shell dumpsy battery
3. Look for lines: level: 85 voltage: 3987 temperature: 320 technology: Li-ion Here level - current charge, voltage - voltage in millivolts (3987 mV = 3.987 V), temperature - temperature in tenths of a degree (320 = 32 ° C).

To obtain data on capacity, use the command:

adb shell dumpsys batterystats

In the conclusion, look for computeBatteryRealtime - there will be information about energy consumption and approximate capacity.

⚠️ Attention: Teams ADB may not work MIUI with engineering locks (e.g., Chinese firmware versions) in which case use battery applications or testers.

Physical inspection of the battery (visual signs of wear)

If software methods don’t give a definitive answer, examine the battery physically. This is true if the phone has already been disassembled (for example, after a drop or replacement of the screen). Xiaomi Redmi uses lithium polymer batteries (Li-Po), which can swell or leak over time.

Signs of critical wear:

• 🔋 Bloating: the phone body is deformed, the screen is moving away from the frame, the back cover is arching out. Dangerous! This battery needs to be replaced urgently.
• 💧 Electrolyte slack: white or green plaque on the board near the battery, a sign of leakage that could damage the motherboard.
• 🔥 Overheating: The phone heats up even when it is simple (for example, lying on a table with the screen off).
• ⚡ Unstable charge: charge level jumps (for example, from 50% drops to 1%), the phone turns off at 20-30%.

How to inspect the battery:

1. Turn off the phone and remove the back cover (on removable battery models, such as the Redmi 4A or Redmi 5).
2. Check the battery for bloating. The normal battery is flat, no bumps.
3. Check the contacts for oxidation or corrosion.

If the battery is swelling, don't try to puncture or compress it, it can cause fire, and take the phone to a service center for safe disposal and replacement.

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A bloated battery is not only a risk of damage to your phone, but a real fire hazard. Don't use a phone with a deformed battery!

6.Discharge test: how to check real working hours

One of the most reliable ways to assess the state of the battery is a test for the discharge, which shows how long the phone will last from full charge to shutdown in different scenarios (screen, games, simple).

• 📱 Fully charged phone (up to 100%).
• 🔌 Disconnected charging cable.
• ⏱️ Timer (you can use a stopwatch on your phone).

Instructions:

1. Charge your phone to 100% and disconnect from the network.
2. Turn on the plane mode (to eliminate network influence).
3. Set the screen brightness to 50% and run the test: 📺 Video Test: Enable YouTube Videos in Full HD And keep a timeline until it's turned off. 🎮 Play the game test: run Genshin Impact or PUBG maximum-setting. 📵 Test in simple: leave your phone in standby mode (screen off, background processes off).

Compare the result with the norms for your model (see the table below).

If the battery is 30 percent or more short of normal, the battery is worn out, for example, if the Redmi Note 12 keeps the charge in games for less than 2.5 hours, it’s time to think about replacing it.

7.When to change the battery: the criteria for replacement

You don't always have to wait until the battery dies, and there are clear signs that it needs to be replaced right now, even if the phone is more or less charged.

• 🔋 Capacity below 70% of nominal value (for example, 3,500 mAh instead of 5000 mAh).
• ⚡ The phone turns off at 20-30% charge (calibration failure or critical wear).
• 🌡️ Overheating during charging (above 45)°C) or in plain.
• 📉 The operating time has been reduced by 2 times compared to the new phone.
• 💥 Bloating or leakage of electrolyte (visual signs).

If one of the items is right, the battery needs to be replaced.

• Damage to the motherboard (due to electrolyte leakage).
• Bloated screen or back cover.
• Risk of fire (in extremely rare cases).

The cost of replacing the battery in Xiaomi Redmi:

• 💰 Official service: 1,500–3,000 ₽ (model-wise).
• 🛠️ Informal workshops: 800–1,500 ₽ (risk of poor-quality battery).
• 🔧 Self-sustained replacement: 500–1,200 ₽ (Experience and tools are needed).

⚠️ Note: When replacing a battery in unofficial services, require a certified battery labeled Xiaomi or ATL (Xiaomi's original battery maker, cheap ones could swell in a month.

FAQ: Frequent questions about Xiaomi Redmi battery