Samsung Galaxy S21

How to Fix Samsung S21 Battery Drain After Update

Is your Galaxy S21's battery drains faster after the software update? Here is the fix!
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If you’ve recently updated your Samsung Galaxy S21 to the latest One UI 5.1 and noticed that the battery drain faster than usual, then you’re not the only one who experiences this problem. 

Many users have reported that their Galaxy S21’s battery drains faster after this update, and according to our inspections, this happens because the update contains a bug or the update did not complete properly.

We created this guide specifically to address this issue. Here, we have compiled six proven solutions to fix the battery drain problem on your Samsung Galaxy S21. These solutions are straightforward and can be done without any technical expertise. 

Let’s get started.

Note: Solutions in this guide will work on any Samsung Galaxy S21 model (S21, S21 Plus, S21 Fe, and S21 Ultra models.)

Editor’s note: We created these instructions using a Samsung Galaxy S21 running Android 13. Depending on your device’s software version, some steps and menu positions may look slightly different.

Fix 01: Check Battery Usage

The first step you should do to troubleshoot the battery drain issue on your Galaxy S21 is to check the battery usage. This is the best way to identify if any specific app is consuming more power than usual. 

A user on Reddit reported that the Galaxy keyboard was consuming an abnormal amount of battery power after the One UI 5.1 update. Interestingly, a lot of users also commented that they are also having the same issue.

Here’s how you can check the battery usage on your Galaxy S21:

  1. Open Settings app.
  2. Go to Battery and device care.
Battery and device care
  1. Tap on Battery.
Battery usage graph

This will display a list of apps along with the percentage of battery they have consumed. If you notice any app consuming more power than usual, especially if it’s an app that you don’t use frequently, take note of it. In the next section, we will discuss how to handle such problematic apps.

Fix 02: Clear Problematic App Caches & Update Them

After identifying the apps that are consuming more power than usual, you can proceed to clear their cache. Because since you have updated the software, the app cache may not work well with the current OS version, leading to issues like increased battery drain.

It is easy to clear the app cache. Here are the steps you need to follow:

Note: Clearing an app’s cache will not delete any important data. However, it might log you out of the app or reset some settings.

  1. Go to Settings.
  2. Tap on Apps.
  3. Tap on the app causing battery drain.
  4. Go to Storage.
  5. Tap on Clear cache.
Samsung keyboard clear cache

After clearing the cache, you need to update these apps. This is because some apps might still not be compatible with the current OS. Nevertheless, developers often release updates to fix bugs and improve performance, which could solve the battery drain issue.

Here’s how to update apps on your Galaxy S21:

  1. Open Google Play Store.
  2. Tap on the profile icon.
Google play store - profile
  1. Tap on Manage apps and device.
Manage apps and devices
  1. Tap on the Manage tab.
  2. Select “Updates available” button.
Updates available
  1. Here, you’ll see a list of apps with available updates. Tap on the app that’s consuming more power.
  2. Tap on Update.

Fix 03: Turn Off High Processing Speed

In your Samsung Galaxy S21, there are three processing speeds you can choose from in Settings: “Optimized”, “High”, and “Maximum”

These processing speed profiles have a significant effect on your device’s battery life. After the One UI 5.1 update, there’s a possibility that the “Maximum” profile was selected automatically, which could be causing the faster battery drain.

TIP: The “Maximum” profile allows your device’s processor to run at its maximum power, which can quickly drain the battery. On the other hand, the “Optimized” profile balances battery life and performance by adjusting your device’s settings to reduce power consumption.

Here’s how you can check your device’s processing speed profile and switch to the “Optimized” profile:

  1. Open the Settings.
  2. Scroll down and tap on Battery and device care.
  3. Tap on Battery.
  4. Tap on More battery settings.
More battery settings
  1. Tap on Processing speed.
Processing speed
  1. Select “Optimized”.
Optimized processing speed
  1. Confirm.

By switching to the “Optimized” profile, your device will adjust its settings to balance performance and battery life, which will resolve the battery drain issue.

Fix 04: Turn On Adaptive Battery

The Adaptive Battery feature is a built-in option in Samsung Galaxy devices that uses advanced algorithms to understand your app usage patterns. This intelligent feature can limit battery usage for the apps that you use less often. In essence, it prioritizes battery power for the apps you use most, helping extend your battery life.

To turn on Adaptive Battery on your Samsung Galaxy S21, follow these steps:

  1. Go to Settings.
  2. Tap on Battery and device care.
  3. Tap on Battery.
  4. Scroll down and tap on More battery settings.
  5. Toggle on Adaptive battery.
Adaptive battery

It may take a few days for Adaptive Battery to fully understand your app usage patterns. So, don’t worry if you don’t see immediate results. Meantime, follow the other solutions below.

Fix 05: Turn Off Unused Features

Some of the most power-consuming features include the Screen refresh rate, 5G mobile network mode, Bluetooth, GPS, NFC, and Motions and gesture settings (These are typically found under the advanced features section in your device settings).

The Screen refresh rate, for instance, can be set to 120Hz for a smoother experience. However, this can significantly drain your battery. Therefore, consider setting it to the standard 60Hz to conserve battery life.

5G mobile data also eats up your device’s battery. If you’re not in an area with 5G coverage or if you’re connected to a Wi-Fi network, it’s best to turn this feature off.

Okay, that is enough. Now you know what features you should turn off. 

Here’s how you can turn off the other features:

  1. Go to Settings.
  2. Scroll down and tap on Display.
  3. Tap on Motion smoothness and select Standard.
  4. Go back to the main Settings menu and tap on Connections.
  5. Here, you can toggle off Bluetooth, NFC and payment, and Location (for GPS).
Connections - bluetooth
Nfc and contactless payments
  1. Go back to the main Settings menu and tap on Mobile networks.
  2. Change the network mode from 5G/LTE if you’re not using it.
Network mode
  1. Go back to the main Settings menu and tap on Advanced features.
  2. Scroll down to Motions and gestures and toggle off the features you’re not using.

Every little bit helps when it comes to conserving battery life. By turning off these unused features, you can significantly extend the battery life of your Samsung Galaxy S21.

Fix 06: Do Another Software Update

There’s a high chance that Samsung is aware of the issue and has already developed a fix, which will be included in the next update. Therefore, we recommend you update your Galaxy S21.

TIP: Keep an eye on our software update tracker for Samsung Galaxy S21. We keep it updated with the latest software updates and fixes released by Samsung.

To check if there’s a new software update available for your Samsung Galaxy S21, follow these steps:

  1. Head over to Settings.
  2. Tap on Battery and device care.
  3. Tap on Software update.
Software update
  1. Then, tap on Download and install.
Download and install

After updating, monitor your battery usage to see if the problem has been resolved.

Wrapping Up

In this guide, we gave you six solutions to the battery drain issue that many Samsung Galaxy S21 users have been experiencing following the recent One UI 5.1 update.

Do you have any other questions regarding this guide? If so, feel free to leave a comment below. If you found this guide helpful, don’t forget to share it with others who might be experiencing the same issue. This is because your share might be the solution they’ve been searching for.

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Content writer and Web developer at and he is the big brain behind the technical aspects of this tech blog.

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