7 Ways to Save Battery on Samsung Galaxy S9

Updated November 26, 2019

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Introduction

Battery lifetime is arguably the biggest problem facing smartphone users today. This guide shows 7 ways to turn on battery saver on Samsung Galaxy S9. Doing this will increase the battery life of your phone.

Turn on Battery Saver: High Level Steps

Here are the 7 top level steps I recommend to save you tones of battery life:

Use “Optimize Now”
Configure Power saving Mode
Enable “Put App to sleep”
Disable Background App Activity
Reduce Device Brightness
Enable Wifi Power Saving Mode
Optimize Battery Usage for Individual Apps

Details of each step is shown below. All the steps described will start from Settings. Here is the image. I will not show this image in the individual steps.

Turn on Battery Saver: Open Settings App

Turn on Battery Saver: Use “Optimize Now”

This is one quick way to turn on battery saver for your Samsung phone.

Here are the steps

On your Samsung Phone, open Settings.

Turn on Battery Saver: Use "Optimize Now"

Then click Device Care.

Next, click Optimize Now. The process will run. Then return optimization results. See a sample result below.

turn on battery saver - Optimize Now result

Turn on Battery Saver: Select a Power Saving Mode

Follow the steps below to set up the right power saving mode for reduced battery usage.

From Settings page, select Device Care.

Click Battery.

When Battery app opens, click Power mode.

turn on battery saver - power saving mode

Then select one of the last 2 options: Medium power saving or Maximum power saving.

Turn on Battery Saver: Enable “Put app to sleep”

The “Put app to sleep” feature is configured per individual app. When you toggle this setting on, the app will be put to sleep immediately when it is not in use.

In other words, any app with this feature turned on will perform limited background activities. Thereby saving you battery.

First navigate to Settings > Device Care > Battery. Then follow the steps below to switch “Put app to sleep” on for individual apps:

Beneath the Battery App, click the drop-down beside Usage by apps. Then select 1 week. This will sort the Apps by battery usage, with apps that consumed most battery in the past 1 week on top.

Turn on Battery Saver: Enable "Put app to sleep"

Because this settings is configured on per-app basis, I recommend you set it up for the first 5 to 10 apps.

To turn on battery saver with this method, click on the individual app. For this example, I will click Analytics (the first app on my list).
When the app opens, scroll down to “Put app to sleep” and switch it on.

Turn on Battery Saver: Disable Background App Activity

One reason you run out of battery is because a lot of apps constantly refresh. This happens on the background.

One way to turn on battery saver is to stop background app refresh for apps with the highest battery consumption.

To determine top battery use apps, use the steps in the last section. Note the top 5 apps. then stop them from performing background refresh.

Here are the steps to stop app from refreshing on the background:

Navigate to Settings > Apps.

Turn on Battery Saver: Disable Background App Activity

Then, click the App you want to stop from refreshing on the background.

You can use search to find the app. Then click on it.

When the app opens, click Battery. Then toggle the switch beside Allow background activity to switch it off.

Turn on Battery Saver: Reduce Device Brightness

Most smartphone users leave their device brightness at default settings. This consumes more battery than necessary.

Another way to turn on battery saver is to adjust the brightness settings of your device.

Here are the steps:

Navigate to Settings > Display.

Turn on Battery Saver: Reduce Device Brightness

Beneath Brightness, use the slider to reduce the brightness. You may also switch Adaptive brightness. Read the details above to see how you can use this feature.