Battery drains quickly on Galaxy S21, S21+ and S21 Ultra

Samsung recently introduced the S21 lineup, which includes the S21, S21 Plus, and S21 Ultra. The S21 series phones have come in a completely new avatar. They have a flat front display complemented by a premium matte/glass finish on the back. Don't forget that these phones come with a uniquely designed camera. In terms of battery, the S21, S21 Plus and S21 Ultra come with 4000mAh, 4800mAh and 5000mAh capacities respectively. However, it is quite common for Galaxy smartphones to experience battery drain issues. The Galaxy S20 series had this. Some users are reporting issues with the battery draining on their Galaxy S21 smartphones.

This may be the result of unoptimized software or hardware. So, it is better to know about the different ways to solve this problem.

In this guide, we will tell you different ways to fix fast battery drain on Galaxy S21, S21 Plus and S21 Ultra. So let's get started.

Put unused apps to sleep

We are sure that there are many applications on your phone that you rarely use. You may not realize it, but these apps keep running in the background causing excessive battery drain on Galaxy S21 phones. So what do you need to do? It is best to put such unused applications into sleep mode.

Here's how to put an app to sleep on the Galaxy S21 Ultra and other Samsung Galaxy phones:

Go to Settings
Click on Device Maintenance
Click on Battery
Now click on Energy Monitoring
Tap on Apps in Sleep Mode
Now add the app you want to put to sleep

If the application is no longer needed, you can delete it. Over time, the battery life of the Galaxy S21, S21 Plus and S21 Ultra will gradually increase.

The battery runs out quickly... What should I do?

If your Android phone is quickly draining, try lowering the brightness of the screen backlight. This is done directly in the notification panel.

You can also go to “Settings”, to the “Display” section. There you can find the “Adaptive adjustment” item - it is recommended to enable the checkbox next to it. In this case, the system will adjust the brightness itself, focusing on the level of external illumination. Unfortunately, such an item is not available in budget devices, since they are often not equipped with a light sensor.

Wireless modules also consume quite a lot of battery power. These include NFC, Bluetooth, 3G or 4G (LTE), and Wi-Fi. The first two modules can be disabled, activating them only as needed. This is done in the same “Settings”, but in the “Wireless Networks” tab. Click on the “More” button - this will take you to the desired subsection. Well, you will immediately see a button leading to Bluetooth control.

In the “More” subsection you can deactivate NFC if your smartphone supports this technology.

Inexpensive devices are equipped with a budget GPS chip, which sometimes does not even support the energy-saving A-GPS function. If the navigation part of your smartphone is not particularly important for you, then GPS can also be turned off. To do this, select “Location” in “Settings”.

What you should be interested in here is the “Mode” option. Select "By network coordinates". In this case, the smartphone will lose the ability to accurately determine your location, but its GPS chip will stop consuming energy.

To save battery power, you can stop playing games. The fact is that they consume energy most actively. And some shareware projects do this even in the background - evidence of this is the various notifications that arrive regularly on your smartphone.

Seriously reduce battery life and regular reboots. They are usually caused by unstable applications and should be removed. Also, something could happen to the Android operating system itself - in this case, you can try to return to factory settings. But remember that in this case all user data will be deleted from the device.

Even root access can affect battery life. Try removing root rights - it is possible that after this the smartphone will work longer.

It is quite possible that the problem lies in the software you installed. Some programs have terrible optimization or deliberately consume a lot of resources, which affects energy consumption. For example, Facebook and Facebook Messenger belong to the second type. The social network client and messenger get access to almost all the data available on the smartphone - along the way, these applications massively consume battery power, as a result of which it runs out very quickly.

In early versions of the Android operating system, the power consumption of each application remained implicit. But later a “Battery” subsection appeared in “Settings”. It details which programs and games are the most power-hungry.

In new Samsung smartphones, you can learn about the energy consumption of each application in even more detail. All information is located on the page of a particular program in the Application Manager. Here you can find out how much CPU load the application creates, as well as other interesting information.

On smartphones with a more current version of Android, this item may be called “Auto Brightness”. Typically, it can be found in the notification panel. There may also be a “Shades of Gray” function here, which also saves battery power.

If you are using a smartphone with an OLED display, you can set a black wallpaper on the screen to further save battery power. The fact is that such devices do not need backlighting to display black pixels. Therefore, the more black pixels on an OLED display, the more battery power is consumed.

On some smartphones running a more modern version of Android, there is a special “Power and Performance” section in the settings. Click it to view available energy consumption information. Using the "Optimize" button you can configure automatic battery consumption. Below you can find a button to turn on the power saving mode (before the low battery warning appears).

Through activity control, you can set conditions for different applications. For example, prohibit work in the background, make it inactive, or set other restrictions.

As mentioned above, malware also consumes a lot of battery power. Fortunately, downloading a virus via Google Play is not as easy as it seems. But other resources are literally replete with malicious applications. Therefore, it is recommended to prevent your smartphone or tablet from downloading games from the program from other sources. This is done by going to the “Settings” subsection called “Security”. Here you should uncheck the “Unknown sources” checkbox.

It is also recommended to install an antivirus on your smartphone. You can get acquainted with worthy candidates for this role in the article “The best antiviruses for Android”.

Reduce screen brightness

Smartphone users tend to overlook the fact that higher brightness levels can cause battery drain on Galaxy S21 smartphones. Most users set the brightness level to 90% or higher. You may not realize it, but this could be a possible reason why your Galaxy S21 battery is draining. It should be noted that the display is the main battery consuming component. So, the more you keep the display on, the more the battery drains and vice versa.

You can turn on the auto brightness feature to reduce battery drain on the Galaxy S21, S21 Plus, and S21 Ulta. This feature automatically increases the screen brightness when you are outdoors in bright daylight, and decreases it when you are in an area with insufficient ambient light.

Here's how to enable the auto-brightness feature on Galaxy S21 series phones:

On the home screen, tap on Settings
Go to Screen
Click on Auto Brightness
Now toggle the switch to enable auto brightness

Causes

Taking into account the above and operating practice, it is possible to determine why the Samsung phone began to discharge quickly. Several points can be highlighted here:

Natural wear and tear. The condition of a smartphone battery can be judged not only by its characteristics and shorter service life, but also by its appearance. Sometimes damaged batteries swell slightly.
Application in low and high temperatures. In such modes, the battery of Samsung and other devices is quickly discharged. The operating temperature range of the device can be found in the specifications.
Increased display brightness. If you set this parameter to 100%, the battery on your smartphone will run out very quickly. The optimal solution is to set the brightness level to somewhere around 50-60 percent.
The activity of applications and options that take up a lot of resources. If all functions work on a Samsung phone, the battery drains quickly. The most energy-intensive operation is considered to be wireless networking, bluetooth and NFC. To save battery, it is advisable to disable these options if necessary.
Virus programs. If the security system recommends not to download certain applications or go to a tab, these warnings must be taken into account.
The GPS sensor is turned on and the cellular connection is weak. Activated GPS and a poor network literally “eat up” the battery before our eyes.

These are just some of the reasons why a new or old battery on a Samsung phone drains quickly. To this list you can add software failure, battery failure and other reasons. In this case, the task of the smartphone owner is to find the problem and try to improve the performance of the power source (if possible).

Reboot your Galaxy S21 phone

Although rebooting your phone remains an old technique, it is quite effective. A quick reboot can solve the battery drain problem on the Galaxy S21. When you reboot your device, the operating system is rebooted and the memory is refreshed, ultimately eliminating most software glitches. Before trying other methods, it is best to reboot your device once to resolve battery drain issues.

It's worth noting that Samsung offers scheduled automatic reboot features on Galaxy devices. Here's how to enable the auto restart feature on Samsung Galaxy S21 phones.

Go to Settings
Scroll down and click Device Maintenance
Click on the three dots in the upper right corner of your mobile phone screen
Now click on the More
Activate the auto restart switch

When you're done, you'll be asked to select a time and date to automatically restart. We recommend doing this once every 10-15 days.

Why doesn't the new battery hold a charge?

Phones use lithium-ion or lithium-polymer types of batteries. They are subject to defects, wear and tear, aging and... even restoration from recycled materials for resale. Chinese sellers on Aliexpress, for example, take advantage of this for profit (not all, of course).

In our company Neovolt.ru, each employee is prepared to deal with a low-quality battery and is able to determine its reliability based on primary signs and on special equipment. Defects are an inevitable part of any manufacturing process (especially in the electrochemical industry) that must be identified.

And today we want to share with you our experience on how to minimize your risks when buying a new replacement battery in your phone.

Enable night/dark mode

Another way to prevent your Galaxy S21 series phones from draining your battery quickly overnight is to turn on Dark/Night mode. So how does dark/night mode save battery? The fact is that the S21 series phone has an AMOLED display made from OLED pixels. This allows you to control the amount of light displayed by each pixel. But when you're in dark mode and the display shows black, the OLED pixels don't light up at all, resulting in deeper blacks; it ultimately consumes less energy. It's worth noting that night/dark mode is also less straining on the eyes.

Here's how to enable dark/night mode on the Galaxy S21 Series:

Go to Settings
Click on Screen
Turn on Dark/Night Mode

We also recommend using black wallpapers to extend the battery life of your Samsung Galaxy S21/S21 Plus/S21 Ultra.

We determine the reason why the Samsung Galaxy began to discharge quickly

To determine why your Samsung Galaxy discharges quickly, you need to first ask yourself how often you use the device. If you spend your days and nights there, using all the functions at the same time, then this is hardly surprising. However, if the device is used only for calls and, say, checking email, a quick discharge should raise suspicions. In general, what do you mean by fast discharge?

If at the end of the day, during which the device was repeatedly used for calls, accessing the Internet, and listening to music, half or less of the full scale remained, then this is normal. If you use it less intensively, you will need to charge it even less often – once every few days.

If the battery has just been full, and suddenly after a couple of calls there is suddenly 15-25% left - this is a problem. The first step is to assess the condition of the battery. Even a new battery does not exclude the possibility that it may be the cause. Unfortunately, you come across a frankly low-quality product that is unable to fully cope with its functions from the very beginning.

If more than three years have passed since the purchase of the battery, then this is 100% the reason.

The battery's appearance can also indicate that the battery is completely unusable - swelling, deformation and cracks - this is a signal that such a battery needs to be replaced immediately.

If you are sure that the battery has nothing to do with it, then you need to carefully study the settings of your equipment. There are many nuances that can “gobble up” the charge in a matter of hours.

Important! If the battery is swollen and deformed, but you still continue to use it, be prepared for the fact that you will soon have to replace the entire phone. The fact is that such a battery can leak electrolyte at any time. It will flood the phone's microcircuits, causing the device to fail. It is better to change the battery in time than to pay several times more for a new phone later.

Disable Always-ON-Display

The Always-ON-Display feature allows Samsung Galaxy users to see a small clock with date, battery and notifications even when the screen is off. While this seems useful, it could be another reason why your Galaxy 21 battery drains overnight. For better understanding, let's assume that you receive hundreds of notifications every day. Each time a notification is received, the display lights up, in this case ultimately a hundred times. Since the display lights up, it can consume a lot of power. Therefore, we recommend that you disable the Always-ON-Display feature to prevent battery drain on Galaxy S21 series phones.

Here's how to disable Always-ON-Display on Galaxy S21 phones:

Go to Settings
Tap on Lock Screen
Now turn off Always-ON-Display (if it is enabled)

Reason five why your Samsung phone battery drains quickly - continuous WiFi

Constantly searching for a wireless network with a smartphone is another very common reason for a rapid decrease in battery charge.

The Wi-Fi search function should be disabled when we are not within its range or do not want to connect to the network.

Of course, this is inconvenient, but if you consider that Wi-Fi can consume up to 25 percent of the charge, then it’s worth thinking about.

Mobile Internet is also a good gift, and the higher the technology (edge, 3G, 4G, 5G), the higher the consumption.

Turn off connectivity features when not in use

You may not realize it, but turning off connectivity features like Bluetooth, Wi-Fi, GPS can help prevent the battery drain problem. Because these features run in the background and look for signals, they may consume more battery power than you might expect. Thus, it is better to disable these features when you are not using them.

You can simply turn them off by going to Settings > Connections and start disabling features you don't use.

Possible solutions and workarounds to extend the battery life of your Galaxy A3 smartphone

Below are the standard procedures and workarounds to resolve battery issues on your Galaxy A3 and save as much power as possible. Feel free to try any of the following solutions if necessary.

Determine which apps are draining the most of your battery

As explained earlier, bad apps can be a trigger. To rule this out as a possible cause, check your battery usage and go into more detail.

To do this, go to Settings->Device->Battery
or
Settings->Power->Battery Usage.
menu (in other options), then view a list of all applications with the amount of energy consumed. If you see something unusual, such as certain apps using a disproportionate amount of power, consider uninstalling the app.

Remove unnecessary apps

Apps drain your battery whether it's open or not. All apps that are no longer in use should be removed from your device to reduce the power consumption of apps.

To do this, go to Settings->Apps->All
, then tap on each app and tap Delete to delete it along with all the data it created.

Be sure to remove unwanted apps that constantly show ads because these ads can consume a lot of energy.

Remove unused widgets from your home screen

Display components, such as widgets on your home screen, can also drain your device's battery. Some Android apps, such as weather apps, news apps, and social media, come with widgets that are placed on the home screen for real-time updates. Due to constant synchronization and animation, these widgets can drain your battery faster. You always have an app drawer to access any of these apps whenever needed.

Enable airplane mode

When using the Galaxy A3 in areas with low signal strength or no network coverage, turn on airplane mode because if you don't, your device will constantly try to search for a strong signal and try to connect to any available networks nearby. Putting your device into airplane mode while you sleep can also help you save lots and lots of energy.

To access this option, go to Settings->Airplane mode->
then toggle the switch to enable this feature.

Connectivity features such as Wi-Fi, Bluetooth and GPS location services will be disabled in this mode.

Turn off notifications when you don't need them

Getting real-time notification updates isn't that necessary unless it's for calls or texts. For other things like email or social media, you might want to turn off notifications because they're much less useful.

To do this, go to Settings->Applications->
then uncheck the
Show notifications
box for the app.
In Android 7.0, go to Settings->Device->Notifications->
, then manually configure notification levels for each app.

You can also choose the option to never show notifications or to display them silently without waking the screen, vibrating, or causing a ping.

Disable connectivity features and location services when not in use

GPS, Bluetooth, and Wi-Fi also consume power on your device when they are turned on because they force the device to remain connected to the server, maps, or other devices they are connected to (Bluetooth). Alternatively, you can do all of this at once using the previous method, which is to turn on airplane mode on your phone.

Reduce screen brightness.

Again, the brighter, the brighter the light. screen, the more energy it requires and consumes. Therefore, setting the lower level to an appropriate level can help preserve battery power.

Enable power saving mode

Android devices like Galaxy A3 have this feature which helps to maximize battery life and extend the battery life until the last few minutes. When enabled, other features such as screen animations, background syncing, and location services are disabled, reducing the load on your phone. Alternatively, you can manually adjust your power saving settings by going to Settings->Power Options->

, and then make the necessary power configurations according to your preferences. You can set it to not skimp on processor power, screen brightness, or vibration feedback, and you can choose whether to turn off your data connection when the phone is in standby mode.

Update software

Marshmallow and Nougat have a default mode called Doze, which reduces the amount of battery used in standby mode, preventing most apps from accessing the Internet or preventing the phone from waking up with notifications. The updated version of Doze in Android Nougat already has tighter restrictions on which apps are allowed to sync updates when the device's screen is off, and how often those apps can wake the phone from sleep.

To get started, go to Settings->General->Update your phone's software.

You will usually see a notification if an update is available. If so, follow the on-screen instructions to download and install the new update file for your device's software.

Calibrate your battery periodically

Battery calibration basically involves completely discharging and then recharging your phone battery. It is recommended to calibrate the battery once every 3 months to maintain its charging capacity. So if you haven't already, give it a try and see what it has to offer.

Seek additional help

If you think the problem is due to a bad battery or a software update error, contact Samsung support or your carrier to report the problem and other recommendations. Be sure to take advantage of the warranty if your device is still under warranty.

Messages you may also want to read:

What to do when your Samsung Galaxy A3 displays the "moisture detected" icon[Troubleshooting Guide]
What to do with a slow charging Samsung Galaxy A3? [Troubleshooting Guide]
Samsung Galaxy A3 won't charge due to "moisture detected" warning [Troubleshooting Guide]
How to Fix Samsung Galaxy A3 (2017) Black Screen of Death [Troubleshooting Guide]
Why does Facebook keep crashing on my Samsung Galaxy A3 and how to fix it? [Troubleshooting Guide]
How to Fix Samsung Galaxy A3 Entered Boot Loop and Can't Start [Troubleshooting Guide]
How to fix Samsung Galaxy A3 with black screen and unresponsive but software buttons light up [Troubleshooting Guide]

Reduce display resolution

High screen resolution is another factor that causes battery drain on the Samsung Galaxy S21 Ultra. While the display looks great with a higher screen resolution, it can consume a lot of power, causing your battery to drain quickly. So, it is best to reduce the screen resolution on Galaxy S21 phones.

Here's how to change screen resolution on Samsung Galaxy S21 Ultra:

Go to Settings
Click on the Screen
Now click on Screen Resolution
Choose HD+ or FHD+ option

Power banks - to save a weak battery

People who are experiencing the problem of fast battery drain on their smartphone and do not want to adhere to the above restrictions can use a modern power bank.

Thanks to this gadget, you can significantly extend the battery life, as well as become independent from external power for a long time.

During a full day trip on a train or other trip, you can turn on the equipment without worrying about the availability of outlets.

The only thing you need to remember is to charge the power bank first, and when choosing, pay attention to its potential. I also recommend watching the video below. Good luck.

Turn off notifications from unused apps

Sometimes unused apps run in the background and send data-consuming notifications. Not only do they waste your data plan, but they also cause battery drain issues in your Galxay S21 series phone. So, the best thing to do is turn off notifications from such apps and see if that solves the battery drain issue.

Here's how to turn off app notifications:

Click on Settings
Scroll and tap Notifications
From the list, select an application that you do not use regularly
Then turn off the switch next to an app you don't use often

For example, you can turn off notifications for games or apps that occasionally notify you about in-app purchases.

Battery saving apps

If your Samsung smartphone discharges quickly, you can install a special application that monitors and saves the battery. Best software:

Battery Doctor is a convenient program that monitors the charge level and shows the reasons why the battery is draining quickly. The application compares different states of the power source, calculates the impact of applications and different processes on the battery. Software capabilities allow you to change profiles and scenarios.

Battery Saver is another application that runs on Android. There are many functions here that allow you to save battery on Samsung smartphones, in which the battery drains quickly. The program shows the current consumption and operating period. control of different energy saving modes is provided.

Power Battery is a reliable application that works without root rights and informs the smartphone owner about the status of the power source. It can also be used to keep background applications under control and optimize the device’s autonomy. There are additional options for deleting files, memory settings, etc.

Other programs are of no less interest, such as Power Pro with a large selection of scenarios and DU Battery Saver, which can extend the battery life for as long as possible. When you purchase the Pro version, you can get even more advanced functionality.

Reduce refresh rate

The Galaxy S21 Ultra is one of the most powerful phones out there right now. It has a high refresh rate, that is, a 120Hz display. Believe it or not, battery drain is directly proportional to a higher refresh rate. You may be thinking how is this possible? This is simply because a higher refresh rate means that other components of the smartphone have to work faster, consuming more power than usual. So, to fix this, you can lower the refresh rate and set it to the standard rate, which is 60Hz, when the smartphone starts overheating and draining the battery.

Here's how you can change the refresh rate on the Galaxy S21 Ultra:

Go to Settings
Click on Screen
Go to Motion Smoothness
Now change the default refresh rate i.e. 120Hz to the standard refresh rate i.e. 60Hz.

How is the battery calibrated on Samsung?

Charge your device to 100%. When charging is complete, disconnect it from the charger.
Open the Phone app as if you were calling someone and dial *#0228#.

For a tablet that doesn't have the Phone app, open the Samsung calculator app and enter the code (+30012012732+). You will then be able to continue entering the above code.

Extended battery information will automatically open.
You are interested in the “Level” field or “Level” and the value that appears next to it.
Click on "Quick Start", confirm the warning and wait about 5 seconds. Don't be alarmed, the display will turn off, then turn on and unlock.
After unlocking the phone, look at the “Level” value again. For example, if it reads 75%, reconnect the phone to the charger and repeat the whole process until 100% is displayed on the “Level”.

When you start calibration, it is important to continue it until the end, that is, until it lights up at 100% level. To ensure that the calibration was successful, repeat the same measurement after a week.

Try using power saving mode

Even though power saving modes limit some features of the Galaxy S21 series phone, it is the best way to deal with battery drain issues. Samsung offers the flexibility to select different power saving modes depending on the usage of the phone. Below we have listed the different power saving modes:

High Performance Mode : This power-saving mode is not ideal for saving battery power. Optimized Power Saving Mode : Ideal for everyday use. Medium Power Saving Mode : If you are a professional, this power saving mode is perfect for you. Ultimate Power Saving Mode : Infrequent users can set this power saving mode to prevent battery drain on the Galaxy S21. Adaptive Power Saving Mode : Saves battery power on Samsung S21 smartphones by understanding the phone's usage patterns.

Here's how to put your phone into power saving mode:

Go to Settings
Click on Device Maintenance
Select Battery
Now tap on Power Saving Mode
You can choose from different power saving modes depending on your usage

What to do if your Samsung Galaxy runs out quickly even if the battery is working?

If the Samsung Galaxy battery is fully functional, but the phone still does not hold a charge, you should look into its settings. Here are the main enemies of charging:

Display brightness. The brighter it works, the more energy it spends. For comfortable work, half or a little more of the maximum is usually enough. The brightness can be adjusted independently when in different conditions (outdoors, indoors, day or night), or you can set automatic adjustment. True, in this case, additional energy will be spent on determining the illumination. In some models, battery consumption can be reduced by setting the wallpaper and display design in dark colors. The main thing is not to forget about eye comfort.
NFC. This module provides high-frequency wireless communication over short distances. When active, it will constantly search for a device nearby with which it can exchange data. This may be needed, for example, for contactless cards. In most cases, this module is not needed at all. You can safely turn it off.
Standby mode. It is also worth adjusting downwards the time before the phone goes into standby mode - when the display goes completely dark. If this period is too long, then the extra seconds also eat up the charge.
Internet. Many owners leave mobile Internet (H+, 3G, 4G, LTE) turned on on their phone or Wi-Fi even when they are not using it. And they don’t even suspect that at this time the device is consuming energy. Therefore, data exchange should be enabled only when access to the network is expected.
GPS. In most cases, the owner of the phone does not need to track its location via satellite. But the GPS or GLONASS module, however, remains turned on for some reason. Need I say that during this time the battery power is wasted?

NFC.
This module provides high-frequency wireless communication over short distances. When active, it will constantly search for a device nearby with which it can exchange data. This may be needed, for example, for contactless cards. In most cases, this module is not needed at all. You can safely turn it off. It is also worth considering that animated wallpapers, smooth transitions, 3D effects and similar seemingly trifles do not contribute to energy saving. To optimize the performance of your smartphone and reduce battery consumption, you need to carefully study the settings, and also disable and delete everything that you do not use, and everything that you can completely do without. Careful attention to your mobile device and its regular “technical inspection” - both externally (including the battery) and regarding settings - is the best way to extend the life of both the entire device and its individual components. And of course, don’t be left without a means of communication at the most inopportune moment.

Disable unused advanced features

Samsung Galaxy S21 series phones come with many advanced features like Edge panels, motion gestures, etc. But many of us leave them enabled even when we are not using them. This could be a potential reason why your Galaxy S21 battery is draining faster than usual. So it's best to keep them turned off when not in use.

Here's how to disable advanced features on Galaxy S21 phones:

On the home screen, tap on Settings
Click on Advanced Features
Now turn off the list of features that you rarely use

How to determine the normal operating time of a smartphone

To determine that a Samsung phone is quickly discharged, you need to understand what exactly affects this circumstance. The battery life of a smartphone depends on the following factors:

Frequency of use and level of load. If you watch movies, download data from the Internet and play games, your Samsung phone will quickly discharge (within three to five hours). At medium loads, it will work quietly for up to a day.
OS malfunctions. During operation in the Android OS, errors may appear due to incorrect removal of applications, incorrect software updates, failure to clear the cache, etc.
Number of installed programs. The battery on a Samsung smartphone drains quickly if applications constantly load the processor.
Battery conditions. Over time, the battery tends to wear out. Consequently, its capacity and real capabilities deteriorate.
Cellular network signal. The worse it is, the faster the Samsung smartphone discharges. This is because the transmitter draws more power from the battery.

Under normal use, the battery lasts on average 1-1.5 days. If you actively use the device, the battery discharges quickly and runs out within 6-8 hours.

Battery recalibration

If the above methods do not help you resolve your battery drain issue, we strongly recommend that you recalibrate your battery. Sometimes batteries can behave strangely and give inaccurate readings or drain the battery faster. This may also be caused by errors after a software update. It would be a good idea to calibrate the battery in the Galaxy S21 series phones.

Here's how to calibrate your Galaxy S21/S21 Plus/S21 Ultra battery:

Be sure to charge your phone to 100% and leave it connected for a couple of hours
Use it until it turns off completely on its own
Now wait an hour or two and charge it again without interruption until it is fully charged

The third reason why the Samsung phone battery drains quickly is the vibrator.

Few people realize that phone vibrations are a huge source of power consumption.

Therefore, unless you need to constantly use silent mode to inform you of calls, it is recommended to use only the ringtone and avoid vibration.

Thanks to this change, your device's battery will last much longer and more efficiently.

IMPORTANT INFORMATION

Please note that even a new Samsung phone will quickly discharge if you install and turn on everything possible.

Software update (if available)

Software updates are always interesting because they bring a lot of new things to users. However, buggy updates can cause battery drain issues on many smartphones, including the latest Galaxy S21 lineup. If you are experiencing this issue, we recommend that you read various forums or technical groups to see if you are one of the many who are experiencing this issue. However, these bugs will be fixed in the next update.

Here's how to update the software on the Galaxy S21:

In the Settings , click on software update .
Then click Download and Install
Now the device will automatically find the latest update
If it is there, click on the Download
After downloading the software, select Install Now

Additionally, we recommend that you try to wipe the cache partition to resolve the battery drain issue on Galaxy S21 devices even after a software update.

Useful tips

Today, many users are wondering why the battery on a Samsung smartphone drains quickly. Above we discussed the main causes and measures to eliminate the problem. In addition, we highlight a number of useful tips for using your smartphone economically:

Buy Samsung phones with Amoled or Super Amoled display. It is considered the most economical, thanks to the display of only color pixels.
Try to minimize the use of widgets that constantly “hang” on the display. They reduce the operating time of the device. This is also due to the fact that programs are constantly updated, so this function must be switched to manual mode.
Turn off vibration. Remember that this mode negatively affects the battery, which quickly discharges. Also, turn off touch vibration. Not only is it annoying, but it also drains the power source.
Buy only original devices. If your Samsung smartphone has a removable power supply, in case of replacement, install only an original product from a trusted manufacturer. Otherwise, you can damage your phone and get less battery life.
Set a shorter waiting period for the display. To reduce the amount of time your screen is active, set the minimum amount of time it remains active after the last activity. We noted above that display performance is one of the main reasons why the battery drains quickly. For example, instead of a minute, you can set only 10 seconds.
Use power saving mode. Samsung smartphones have a special option that allows you to extend battery life. Alternatively, you can turn on Airplane mode.
Turn off special features and gestures. If you rarely use this functionality, give preference to standard management methods. Otherwise, you shouldn't be surprised that the power supply quickly discharges.

Another important tip is to regularly update your device and application. Software developers are constantly optimizing their creations, which allows them to improve their performance and increase the service life of the power source.

Factory reset

If all else fails, we highly recommend that you reset your Galaxy S21, S21 Plus, and S21 Ultra to factory settings. This is the latest remedy to fix fast battery drain on Galaxy S21 phones. This will erase all phone data and all settings will return to default. So, the best thing to do is to back up all your data.

Here's how to reset your Galaxy S21 series phones:

Go to Settings
Click on General Management
Select Reset > Factory Reset
Click on the reset option
Enter your PIN/password or biometric data required to confirm your action
Click on Erase everything

The sixth reason why the Samsung smartphone battery discharges quickly is geolocation

Many applications, such as navigation using Google Maps or Facebook, track the location of smartphone users.

When your battery is draining quickly, it is recommended to disable or limit your location sharing.

This will save power and extend the life of your smartphone, or rather the battery.

Therefore, from time to time it’s a good idea to look at the state of the geolocation, since the applications themselves can launch it.

Visit the Samsung Center

If all else fails, you may need to visit a Samsung service center. All of the above methods refer to software, but faulty hardware requires technical expertise. In most cases, the service center solves the problem of battery drain. If it's beyond repair and under warranty, you may be able to get a replacement if you're lucky.

This brings us to the end of our guide on how to fix battery drain issue on Galaxy S21, S21 Plus and S21 Ultra. We hope that the methods described above helped you solve this annoying problem.

The main reasons for rapid discharge

To begin with, you should understand that the battery can run out very quickly immediately after purchasing the device. And it happens that this starts to happen about six months after you start using your smartphone. All these are completely different cases, and therefore the reasons for the rapid loss of charge may differ.

If the battery of a new device runs out quickly, the following factors may contribute to this:

The phone battery has too low a capacity;
The Android operating system is poorly optimized for specific components;
The device's processor is not designed to run games;
The display resolution is too high for the chipset used.

You can't argue with these reasons. Of course, you can try to reflash the device by installing a different version of the operating system. But often this does not lead to anything good. As well as nothing can be done about the processor. Because of this, the phone heats up during games and quickly discharges. That's why people really like powerful chipsets from Qualcomm, Samsung and Huawei - they are much more energy efficient.

If the smartphone began to quickly discharge completely unexpectedly - many months after its purchase, then the reasons for this may be completely different:

Malware was installed on the device;
One of the installed applications is using too much resources;
GPS navigation is activated too often;
You have turned on the maximum brightness of the backlight;
The smartphone reboots too often.

These reasons can already be combated. Below we will talk about how to achieve increased battery life.

***

Let's summarize all the answers and comments to our visitor's question.

Worn or refurbished
The main reason why a phone battery does not hold a charge lies in its wear and tear and exhaustion of its cycle reserves - 1000 cycles in the best case, on average 500 cycles . Typically 2-3 years is the service life. Often worn-out elements are sold as new after workshops and disposal in China.
Software problem
Most often, a new phone battery does not hold a charge after replacement due to the fact that the settings were not reset and the new battery was not trained. We need training cycles of “charge and discharge”, as well as “training” of the phone software and controller on the BMS board.
Old battery
It is likely that you bought an old battery - check the production date. If this is so, and it was also stored incorrectly in warehouses (in the heat or sun), then the capacity will be very different from the declared one.