How to check the battery on Android: power, wear and actual battery condition

The battery is one of the most vulnerable components of a smartphone. Over time, its capacity decreases and autonomy decreases. But how do you know how worn out the battery of your Androiddevice is? There are several ways: from built-in tools to specialized applications. In this article we will analyze all verification methods - from simple to professional.

It is important to understand that battery power and her real capacity are different things. Power (in watts) determines the charging speed and load the battery can handle, while capacity (in milliamp-hours) determines how much energy it can store. We will show you how to measure both parameters.

If your smartphone begins to discharge after a few hours, overheats while charging, or suddenly turns off at 20-30% charge, these are clear signs of wear and tear. Next, you will learn how to diagnose the problem and what to do next.

Method 1: Built-in Android tools (no applications)

Many manufacturers add hidden menus to the firmware for diagnosing the battery. This data is not always accurate, but gives a general idea of ​​the condition of the battery.

The easiest way is to use diagnostic code. Open the application Phone and enter:

##4636##

In the menu that opens, select Battery information. Here you will see:

• 🔋 Charge level (percentage)
• 🔌 Power source (charging, USB or battery)
• 📊 Health status (if supported)
• ⚡ Voltage (in millivolts)
• 🔥 Temperature (in degrees Celsius)

On some devices (for example, Samsung or Xiaomi) this code may not work. In this case, try an alternative option:

*#0228#

⚠️ Attention: Diagnostic codes may differ depending on the model and firmware version. On some devices, these menus are blocked by the manufacturer.

Method 2: Checking through Android settings (for new versions)

Starting from Android 9 Pie, a section with detailed statistics on battery usage has been added to the system. To open it:

1. Go to Settings → Device care → Battery (on Samsung)
2. Or Settings → Battery (on Xiaomi, Realme, Oppo)
3. Click on the three dots in the upper right corner and select Battery Usage or Battery status

Here you will see a discharge graph, a list of applications that consume the most energy, and assessment of battery condition. On some devices (for example Google Pixel), the percentage of wear is displayed.

If your firmware does not have such a section, try updating the system or use third-party utilities (we will talk about them later).

View the discharge graph for sharp races|

View battery temperature (normal: 25-40°C)|

Check the list of charge eaters|

Make sure battery optimization is enabled-->

Method 3: Applications for deep diagnostics

To accurately check battery capacity and wear, it is better to use specialized applications. They analyze data from the power controller and show the real state of the battery.

Top 3 applications for checking the battery on Android:

• 📊 AccuBattery - shows the current and factory capacity, wear, charging/discharging speed. There are tips for extending the service life.
• 🔍 Battery Guru - monitors temperature, voltage and predicts the remaining battery life.
• 🛠️ CPU-Z - in the section Battery displays technical parameters: charge level, condition, technology (Li-ion/LiPo).

How to use AccuBattery (the most popular application):

1. Install and open the application.
2. Connect the charger and wait for 100% charge.
3. In the section Health you will see real capacity (for example, 3500 mAh instead of the factory 4000 mAh).
4. Tab Charging will show the speed in mA (the norm for fast charging: 1500-3000 mA).

⚠️ Attention: Battery diagnostic apps require access to usage data. Do not install them from unverified sources - this may be a security risk.

Why do applications show different capacities?

A 5-10% difference between apps is normal. The fact is that:

1) Each application uses its own algorithm for calculating wear.

2) The battery controller may produce inaccurate data on older devices.

3) Temperature and load at the time of testing affect the readings.

For accuracy carry out the test with a charge of 40-80% and room temperature.

Method 4: Checking via ADB (for advanced users)

If you want to get maximum accurate data directly from the power controller, use ADB (Android Debug Bridge). This method requires a connection to a computer, but provides the most detailed information.

Instructions:

1. Install ADB Tools on a PC.
2. Enable USB debugging in the developer settings (Settings → About phone → Build number - press 7 times).
3. Connect your phone to the computer and enter in the command line:

   adb shell dumpsys battery

4. Look for the lines:
   • capacity — current charge in %
   • voltage — voltage in µV (divide by 1000 for volts)
   • technology — battery type (Li-ion, LiPo). ADB
   • health — state (GOOD, OVERHEAT, DEAD, etc.)

To obtain information about real capacity use the command:

adb shell dumpsys batterystats --charged

ADB parameter	What does it mean	Normal values
health: 2	Battery status	2 = Good, 3 = Overheating, 4 = Dead
voltage: 4200000	Voltage (μV)	3700-4200 mV (3.7-4.2 V)
temperature: 300	Temperature (°C)	250-400 (25-40°C)
capacity: 85	Current charge (%)	0-100
charge_counter: 3500000	Charge in µAh	Depends on the model (compare with the factory capacity)

Method 5: Physically checking the battery (if the phone is collapsible)

If your device allows you to remove the back cover (for example, Samsung Galaxy S5, Xiaomi Redmi Note 4X), you can visually inspect the battery. This will help identify physical defectsthat are not visible through software tests.

Signs of a faulty battery:

• 🔴 Bloating —the battery is swollen, the phone lid does not close tightly.
• 🟠 Oxidation of contacts —greenish coating on metal parts.
• 🟣 Electrolyte leakage —white or brown coating on the board.
• ⚫ Traces of overheating —blackened or melted areas.

If you find at least one of these signs, Replace the battery immediately. A swollen battery can damage the screen or circuit board, and leaking electrolyte can cause corrosion.

⚠️ Attention: Do not attempt to puncture or bend a swollen battery! This may cause a fire or explosion. Contact the service center.

Method 6: Autonomy test (practical measurements)

The most reliable way to check real capacity is to measure the battery life under standard load. To do this:

1. Charge the phone to 100%.
2. Turn off Wi-Fi, mobile data and leave only basic functions (calls, SMS).
3. Start the timer and wait until it is completely discharged (until turn off).
4. Compare the result with the manufacturer's stated operating time.

Approximate standards for modern smartphones:

• 📱 Budget models (4000 mAh): 12-16 hours in standby mode, 4-6 hours of active screen.
• 📱 Flagships (5000 mAh): 18-24 hours on standby, 6-8 hours of active use.
• 📱 Devices with AMOLED: consumption depends on brightness (the brighter, the faster the discharge).

If your smartphone discharges in 3-4 hours without load, this is a clear sign severe battery wear (the capacity has dropped below 60% of the factory capacity).

What to do if the battery worn out?

If a check shows that the battery capacity has dropped below 70-80% of the factory capacity, it’s time to think about replacement. Here are your options:

1. Official replacement (recommended):

• ✅ Warranty for a new battery (usually 6-12 months).
• ✅ Original or certified batteries are used.
• ❌ More expensive than in unofficial services (price: 2000-6000 rub.).

2. Unofficial service:

• ✅ Cheaper by 30-50%.
• ✅ Faster (often replaced in 1 hour).
• ❌ Risk of installing a low-quality battery.

3. Self-replacement:

• ✅ Minimum cost (you only need to buy a battery).
• ❌ Risk of damaging cables or display.
• ❌ Tools required (suction cup, pick, screwdriver).

After replacing the battery be sure to calibrate it:

1. Charge to 100% and keep charging for 1-2 hours.
2. Discharge to 0% (until the phone turns off).
3. Repeat the cycle 2-3 times.

FAQ: Frequently asked questions about checking the battery on Android

Is it possible to restore the battery capacity?

No, it is impossible to restore a worn-out battery. Lithium-ion and lithium-polymer batteries degrade over time due to chemical processes. The only solution is replacement.

However, you can slow down further wear.:

• Avoid complete discharge (keep the charge in the range of 20-80%).
• Do not use cheap chargers.
• Avoid overheating (do not play heavy games while charging).

Why do applications show different capacities?

A 5-15% difference between apps is normal. Reasons:

• Different algorithms for calculating wear.
• Battery controller error (especially on older devices).
• Temperature and load at the time of the test.

For accuracy, carry out the test at 40-80% charge and room temperature (20-25°C).

How to check the battery on Samsung with One UI?

On smartphones Samsung with firmware One UI there is a hidden diagnostic menu:

1. Open application Phone.
2. Enter the code: *#0228#
3. In the menu Battery Info you will see the voltage, temperature and charge level.

To check wear, use Samsung Members (section Diagnostics → Battery).

What are “charging cycles” and how do they affect the battery?

One charging cycle is a complete discharge and charge the battery to 100%. For example, if you charged the phone from 50% to 100%, and then again from 50% to 100%, this is one cycle.

Modern lithium-ion batteries are designed to significantly reduce capacity. After this, the capacity drops to 70-80% of the original. 300-500 cycles until a noticeable decrease in capacity. After this, the capacity drops to 70-80% of the original.

To extend the service life:

• Avoid frequent full discharges.
• Do not keep the phone on charge after 100%.
• Use original chargers.

Is it possible to use a phone with a swollen battery?

Absolutely not! A swollen battery is:

• Risk fire or explosion (especially when heated).
• Damage screen and internal components.
• Accelerated contact wear on the board.

If you notice that the back cover of the phone has lifted or the battery is “walking” inside the case, immediately:

1. Turn off the device.
2. Remove the battery (if possible).
3. Contact the service center.