Fix Battery Drain Issues in Samsung Galaxy A21 SM-A215U/U1/W After Installing Update

Samsung Galaxy A21 SM-A215U/U1/W is a budget-friendly smartphone with a 4000mAh battery, providing an easy one-day battery life. With a display that does not have a high refresh rate, it consumes less Battery than other smartphones. However, some users may experience sudden battery drain issues after installing an update, significantly affecting their battery life. Background running apps, software glitches, or incorrect settings can cause this issue. In this article, we will discuss some effective methods to fix battery drain issues in Samsung Galaxy A21 SM-A215U/U1/W after installing an update, helping you to enjoy a longer battery life on your device.

After the Samsung Galaxy A21 update, why does the battery drain happen?

However, before we continue, you may want to know a few things about Samsung and its regular OS updaBattery, the Galaxy series mobiles, and the flagship-level series. Samsung has rolled out an OTA update for these models to fix the various bugs reported by users. However, while this update is supposed to fix the previous bugs experienced by the users of these Samsung device models, it also tends to come with a bug that makes the devices consume a lot of Battery. Not all Galaxy mobile users reported this battery drain issue, anyway. But if you’re among the affected users, we have a solution.

However, this battery drain issue seems to be associated with Galaxy devices running on One UI. Nevertheless, we have a couple of solutions, none of which is hard to practice.

After installing the update, how to fix battery drain issues on Samsung Galaxy A21 (SM-A215U/U1/W)?

Whenever a successor version of Android is released, they always focus on Battery improvement. We often notice battery drain issues after the latest security patch update or major upgrades like Android 10. But sometimes, due to some battery glitch, It can happen on the opposite side. You can use the below fix methods when facing the battery drain issue in your Samsung Galaxy A21.

1. Install the latest software

You may need to check out a newer software update available for your device. To check out this, follow the steps below. The bug causing your Galaxy device to consume much Battery has likely been fixed in a newer software version, thus, upgrading to the most recent version of your device. It is wise to take a complete backup before updating your mobile.

• Go to your mobile device settings.

• Scroll down to the About Section and click on the “Software update” option

• Tap the “Download and install” option

• Wait for the search to complete to see if any batteries are available.

• If there’s an updated version, click the downloaBatteryn to update your device software.

However, if there is no more original version, kindly try other solutions below.

2. Sleep most power-consuming apps

It may bring an end to this issue. It disables most auto-run and irrelevant apps that run in the background and drain your Battery quicker. The option to sleeBatterye apps that make more use of your Battery is also available in the device care option. Follow the steps below to sleep most apps on your Galaxy device running on One UI.

• Go to your settings and select the “Device Care” option.

• Look at the bottom; many icons are available; click the “Battery” icon.

• You’ll see all the apps that are draining your Battery.

• Click on them one after the other and toggle the switch beside “Put app to sleep” to be active.

• It will prevent the app from running in the background, and We can improve your battery life.

You can even choose to uninstall the app if it is not essential. Finally, you may change the Power Mode to “High Power Saving Mode.” Click on the “More” icon to access more battery optimization options.

3. Auto Optimization

Auto Optimizing your device battery performance is a feature built into Samsung’s new devices that allows you to delete cache files, stop irrelevant processes in the background, and drain your device battery. It is one of the best ways to solve this battery drain issue. In some cases, optimizing the battery performance will help to make everything function as well as supposed.

• Go to your Samsung Galaxy A21 device settings.

• Scroll down until you see the Device Care option; click on Device Care.

• Click oBatteryhree-dotted vertical lines at the top right corner and select “Auto-optimization.”

• Set the time when the auto-optimization should always run.

You may need to set a time that you don’t often use your device, maybe during the night battery4. Natural Battery Calibration

Generally, most mobile phone battery issuesBatteryrely caused by recalibrating the Battery. This action is simple but takes a loBatteryurs, and it is the best solution to fix battery drain issues on Galaxy Battery running on One UI. Follow the steps below to recalibrate your Samsung Galaxy device battery.

• Use up the Battery until it drains completely; i.e., ensure you use the device until the BatBatteryts to 0% and powers off by itself. Do not attempt to charge the Battery in between this period; ignore the low battery warning, and drain the Battery completely.

• Once the device powers off by itself, charge it back to 10Batterydo not attempt to boot the device or remove the charger until it reaches 100%.

Repeat the two steps; drain the Battery and charge it back to 100%

This process requires a steady power supply as the device is not supposed to be unplugged during the charge period until it reaches 100%.

After doing this two consecutive times, It will recalibrate your Battery, which might fight the issues you’ve been facing for a long time.

5. Recalibrate your Battery using USSD codes to deal with the Samsung Galaxy A21 battery drain issue

• Launch your device dialer and dial this code – *#0228#

• Follow on-screen Instructions

• Restart the device

6. Diagnose apps using Safe Mode

Safe Mode allows us to disable third-party apps. When you don’t face any issues in Safe Mode, the problem for the battery drain is non-system apps. So, you have to find which app to remove. Start with the last installed app. You can boot your mobile into Safe Mode by pressing the Volume Down power button. The combination may vary depending on the manufacturer. Even in safe Mode, you must try other methods if you face a problem.

7. Clear partition cache

Another solution is the clearing of the cache. When caches build upon our mobile phones, they can result in quite a lot of malfunctioning. Thus, clearing all the caches on your device may help fix your battery issue.

• Before going to this option, take a complete backup. Start by powering off the device.

• Boot into Samsung Galaxy A21 recovery mode, pressing the Volume Up, Volume Down, and Power keys.

• Use the volume keys to navigate and the Power key to launch an option; select “clean cache partition.”

• Ignore the warning message that will appear on your screen and continue

• Restart the device after these processes.

8. Disable unwanted apps using ADB to fix the Samsung Galaxy A21 battery drain issue

You can often disable/remove the bloatware apps using Stock Android phones. But, If you are in Custom Skin OS, the chances of injuring the Bloatware apps are less. But, We can Disable the Apps using ADB without root. The methods may vary depending on the manufacturer. You have to find the particular Bloatware apps and disable them. I will give the overall idea about ADB steps and commands. But, the list of packages may vary depending on the manufacturers.

• Download the ADB drivers. Install it on your PC.

• Enable USB Debugging Mode and OEM Unlock; you’ll find these options in Settings >>> Developer options. If you didn’t see the developer options on your settings menu, go to about >>> build number. Click on the “Build Number” row about ten times regularly to activate the “Developer Option” on your device.

• Connect your mobile with a PC and unlock your mobile (Screen Lock).

• Open a command prompt as Administrator and type below to check the ADB status.

• adb devices

• The above command will display some code for device detection. If you didn’t receive any response, Check with the USB Cable. If you get a response, move to the below commands.

• You can disable the apps based on their adb package name. You can find these package names using the below command.

• adb shell pm list packages

• Based on the title, you can exclude unwanted apps. After that, use the am force-stop and pm disables commands with the Application package name.

• You can enter the commands individually, Or All commands and Hit Enter. You can get the application package name in Play Store URL. It will start with com.instagram. Android like that.

• am force-stop package name(e.g: com.sprint.w.installer)

      pm disable-user package name

• Restart your mobile when again stuck on your Samsung Galaxy A21 mobile boot logon and move to different methods.

9. Reset Your Mobile

Take complete backup on your mobile. You can do a soft reset or hard reset. If you follow all the methods and still face issues, you can reset your Samsung Galaxy A21. To Rest your mobile, Go to settings> System>Reset Options> Reset app preferences/ Factory Reset.

• Soft Reset/App Preference Reset– This option will remove all the custom settings we made and return to the default settings. It will not delete user data.

• Hard Reset/Factory Reset– It will remove all user data. Your mobile OS will become new, like when you purchased it, and you must set up everything from the beginning.

You can also use your mobile recovery to reset when you can’t boot into your Mobile OS.

9.1 Stock Recovery method

• Switch off your device. It will boot your mobile into Recovery mode. To do this, press and hold down the Volume Up + Power buttons simultaneously for some time. Then, enter into the Stock Recovery mode.

• If you don’t use Rooted mobiles, you have Stock Recovery, which your official mobile manufacturer usually provides. If you have stock recovery, you have the direct option of “Wipe Data/Factory Reset.” Navigate to this option and confirm it using the power key button. Remember, It will delete your entire mobile data. So, backup first before the process.

9.2 TWRP Recovery method

When using Rooted mobiles, you use Stock Recovery or TWRP custom recovery. If you have Stock Recovery, you can use the above process. When you install TWRP on your mobile, follow the steps below.

• The Keycombinations will boot your mobile into TWRP Recovery mode.
• On the Home screen, you can find the option “Wipe.” Select the wipe option; you will receive further details. Select “Dalvik, Data, and Internal Storage.” Don’t select the System, and it will wipe your OS. After selecting other choices, swipe to erase the data. When the process completes, return to home and boot into OS.

10. Flash Complete Firmware using ODIN

We are going full flash firmware in your boot logo stuck on the Samsung Galaxy A21 mobile. It is a Data loss process. So when you don’t have any choice, and none of the above methods don’t work for you, you can use them. Refer- Flash Samsung Galaxy A21 Firmware using ODIN.

Wrap Up

People always face this kind of battery issue after the software update. Even if the software updates process looks simple, 5-10% of people always face problems making OTA updates. That’s why we suggest you always back up before updating your mobile. Always use cloud photo backup services like Google Photos. Compared with other mobile manufacturers, with the help of Samsung’s available tools, we can fix your Samsung Galaxy A21 battery drain issue.

If you are facing freeze and unresponsive issues on your mobile, You should try different methods than those mentioned above. Ensuring your previous energy savings options are turned on after the update is always wise. Based on your available storage and app size, battery usage may vary. When you are confident that the settings are perfect for battery optimization, you can follow the above steps to fix your mobile. Comment below when you try different methods than above, and those techniques help you. We try to add if those methods work for everyone.

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Selva Ganesh

Selva Ganesh is the Chief Editor of this Blog. He is a Computer Science Engineer, An experienced Android Developer, Professional Blogger with 8+ years in the field. He completed courses about Google News Initiative. He runs Android Infotech which offers Problem Solving Articles around the globe.