Over time, every smartphone owner notices that battery life is decreasing. The device, which previously lived quietly until the evening, now requires recharging by lunchtime. This is a natural process of degradation of lithium-ion batteries, but it is important to understand how much yours has worn out. Unlike the iPhone, where the percentage of battery wear is displayed in the settings, in Android this information is often hidden from the user's eyes. battery. Unlike the iPhone, where the percentage of battery wear is displayed in the settings, in Android this information is often hidden from the user's eyes.
Manufacturers Samsung do not provide a built-in charge cycle counter in the standard settings menu. This creates certain difficulties for those who want to assess the condition of their gadget before purchasing a used device or are planning to replace the battery. But do not despair, there are proven methods that allow you to obtain this data with high accuracy.
In this article we will analyze in detail all the available methods: from using secret engineering codes to installing specialized software. You'll learn how to interpret the numbers and when it's time to consider replacing your power supply.
Using Samsung's secret service code
The fastest way to get battery information is to enter a special combination of characters in the Phone app. This method does not require the installation of third-party apps and works on most models Galaxy S and Galaxy A. However, it is worth considering that in the latest versions of the One UI shell, access to some items in this menu may be limited.
First, open the standard dialer and enter the sequence *#0228#. A diagnostic window with technical parameters will instantly appear on the screen. Here you are interested in the block Battery Status, where the current voltage, charge level and battery status are displayed.
Pay attention to the field Capacity. In ideal condition, it should show a value close to the factory one (for example, 4500 mAh for the Galaxy S21). If the numbers are significantly underestimated, this is a direct signal of physical wear and tear.
⚠️ Attention: Do not press the button Quick Start in this menu unless necessary. This function calibrates the charge indicator, but if the battery is very worn out, it can lead to incorrect display of percentages or sudden shutdown of the phone.
Unfortunately, on many new models, after entering the code, only a general summary is displayed, and detailed information about the actual capacity is hidden. In this case, you will have to resort to software analysis methods, which require a little more time, but give a more detailed picture.
If the code #0228# does not work or shows empty fields, try the code #9900#. This is an alternative system debug menu available on some Samsung firmwares.
Status analysis through the AccuBattery application
The utility is considered the most accurate software solution for assessing battery health. AccuBattery. It doesn’t just read static data, but performs real-time analysis while using the smartphone. This allows you to calculate the real capacity by comparing the amount of charge passed through the controller with the change in charge level as a percentage.
After installing the application from the Google Play Store, you will need some time to collect statistics. The developers recommend using the phone as usual for several days. The more discharge and charge cycles the app records, the more accurate the final calculation will be.
Go to the “Health” tab in the application interface. Here you will see two key values: design capacity and design volume. The difference between them will show the percentage of wear. For example, if 4000 mAh is stated, and the app shows 3200 mAh, wear is 20%.
- 🔋 Calculated capacity —the real amount of energy that the battery can hold at the moment.
- 📉 Wear —the percentage of capacity loss relative to factory specifications.
- ⚡ Discharge rate —shows how quickly the charge is consumed when the screen is on and off.
- 🌡️ Temperature —a critical parameter, overheating accelerates the degradation of chemical elements.
It is important to understand that the data in AccuBattery are estimates, but their error usually does not exceed 5%. This is quite enough to quickly check the condition of a used phone. Regular monitoring will also help identify anomalies, such as too rapid self-discharge.
Checking through the Bixby Routines settings
Owners of modern flagships and mid-budget Samsung models can use the built-in automation tool - Bixby Routines (or “Modes and Scenarios” in new updates). This method allows you to create a logic condition that will notify you of the battery's charge level, which indirectly helps you monitor its behavior.
Although this method will not show the exact milliamp-hour capacity, it is useful for identifying problem areas. You can set up a script that will send a notification when the charge drops below a certain threshold, such as 15%. If notifications come too often or the phone turns off at 10-15%, this is a clear sign of battery degradation.
To configure, go to Settings → Modes and scenarios → Scenarios. Create a new script with the condition "Battery Charge" and the action "Show notification". This will help you better understand the real autonomy of the device in everyday tasks without installing unnecessary software.
This method is especially relevant for those who are afraid to give third-party applications access to system statistics. Built-in tools One UI guarantee data confidentiality and do not load RAM with background processes.
The secret of calibration
If after replacing the battery the percentages jump (for example, from 20% immediately to 5%), try completely discharging the phone before turning it off, then charging it to 100% without turning it on, and only then turn on. This will help the controller recalibrate the charge scale.
Diagnostics using a computer and ADB
For advanced users who want to get the most in-depth data without installing applications on the phone itself, there is a diagnostic method via a computer. To do this, you will need a utility ADB (Android Debug Bridge) and USB debugging mode enabled on your smartphone.
Connect the device to the PC with a cable and open a command line or terminal in the folder with ADB installed. Enter the command adb shell dumpsys batterystats. This command will output a huge log with technical information about the battery, including charge history and current status.
adb shell dumpsys batterystats | findstr "capacity"In the command output, look for lines containing information about the capacity. However, it is worth noting that in recent versions of Android, Google has limited access to some details via ADB for security reasons. Therefore, this method may not work on all models, especially those released after 2022.
An alternative is to use apps like Samsung Tool PRO or similar service utilities for engineers. They are able to read data directly from the power controller, showing the number of recharge cycles and the current SOH (State of Health) status.
The ADB method is most informative for older Samsung models, but on new devices with increased security protection it may show average data.
Comparison table of verification methods
To make it easier for you to choose the appropriate method, we have prepared a summary table. It indicates the advantages and disadvantages of each method, as well as the required resources.
| Method | Accuracy | Complexity | Requirements |
|---|---|---|---|
| Service code | Average | Low | Phone only |
| AccuBattery | High | Low | Several days of use |
| Bixby Routines | Indirect | Average | Scenario settings |
| ADB / PC | High | High | Computer, cable, drivers |
As can be seen from the table, for the average user the application has the optimal balance AccuBattery. It does not require special knowledge and gives clear results. Engineering codes are good for express checking, but often do not show the full picture of wear.
Physical signs of battery wear
In addition to software methods, there are physical signs that cannot be ignored. Lithium-ion batteries are subject to chemical degradation, which manifests itself not only in a decrease in capacity, but also in a change in the physical properties of the battery housing.
One of the most alarming symptoms is swelling of the battery. If the back cover of the smartphone begins to come off, the screen lifts, or the body becomes deformed, it is strictly prohibited to operate such a device. Internal gas pressure may cause fire or damage to the display matrix.
⚠️ Attention: If swelling is detected, immediately stop charging the device and take it to a service center. Do not attempt to puncture or push the battery back in yourself - this may cause a chemical reaction and fire.
It is also worth paying attention to the discharge rate in standby mode. If a phone lying idle overnight loses 10-15% of its charge, this indicates high internal battery resistance or current leakage. In combination with the rapid heating of the case during charging, this is a sure sign that the resource of the battery is exhausted. Sometimes the problem lies not in the battery itself, but in the power controller or software failure. Therefore, before replacing, it is recommended to reset the settings or flash the device to eliminate a software error in the charge display. battery exhausted.
Sometimes the problem lies not in the battery itself, but in the power controller or software glitch. Therefore, before replacing, it is recommended to reset the settings or flash the device to eliminate a software error in the charge display.
☑️ Signs of an urgent battery replacement
Frequently asked questions (FAQ)
Why the service code *#0228# does not show capacity on my Samsung?
In new versions of One UI firmware (starting from Android 11 and above), Samsung has hidden detailed capacity information in this menu for security purposes and to simplify the interface. In this case, use third-party applications like AccuBattery.
How many charge cycles can a Samsung battery withstand?
Modern lithium-ion batteries are designed for approximately 500-800 full charge cycles (from 0 to 100%). After this, their capacity drops to 80% of the original. With careful use, a smartphone can last 3-4 years without replacing the battery.
Is it harmful to use the phone while charging?
Using resource-intensive applications or games while charging causes additional heating. High temperature is the main enemy of lithium-ion chemistry; it accelerates degradation. For everyday tasks (messengers, browser) this is not critical, but it is better to put games aside.
Is it possible to restore the capacity of an old battery?
It is impossible to physically restore the chemical composition of a degraded element. Software calibration can only correct incorrect percentage displays, but will not return lost milliamp hours. The only solution is to replace it with a new original or high-quality compatible battery.
How to extend the life of a Samsung battery?
Enable the “Battery Protection” function in the settings, which limits the charge to 80-85%. Avoid 0% discharge and overheating. Use original chargers, as low-quality power supplies can supply unstable voltage.