How to Make Your Galaxy Battery Last Longer (simple settings)

Rosa is 68. She uses her Galaxy phone to call her sister, to look at photos of her grandchildren, and to check the weather in the morning. By late afternoon, her phone often showed a low battery warning. She was not playing games. She was not watching long videos. She was just using her phone in a normal way, and the battery still ran out too soon.

Rosa thought her phone was broken. It was not broken. A few simple settings were using more power than she needed. Her screen was very bright. Her screen stayed on for a long time after she stopped touching it. Her phone was also searching for Wi-Fi all day, even when she was out shopping and had no Wi-Fi to join. Small changes fixed most of the problem.

This guide shows those small changes. You do not need to learn anything technical. You do not need to download anything. You will change a few settings that are already on your phone. Take your time. Do one change, then stop and see how it feels. You can always change a setting back later. Nothing here will delete your photos, your contacts, or your messages.

Before you start, it helps to know one thing. No setting can make a battery last for ever. Batteries run down when a phone is used. That is normal. These steps only help your phone waste less power when you are not using it, and use less power while you are using it. If your phone still runs out very fast after you try these steps for a few days, ask Samsung support for advice. Do not open the phone yourself.

Step by step: help your battery last longer

Turn the brightness down a little. Swipe down from the very top of your screen with one finger. You will see a bar with a small sun picture. That bar controls how bright your screen is. Drag the small circle on the bar a little to the left. Your screen will get a little darker. It should still be easy to read. A very bright screen uses a lot of power.
Let the phone adjust brightness for you. In that same panel at the top of the screen, look for words like Adaptive brightness or Auto brightness. The exact words may be a little different on your phone. If you see a small switch next to those words, tap the switch so it turns on. Your phone will then make the screen brighter in sunshine and darker indoors, without you having to keep changing it.
Make the screen turn off sooner. Open Settings. Look for the word Display, and tap it. Then look for words about how long the screen stays on, often called Screen timeout. Tap those words. Choose a shorter time, such as 30 seconds or 1 minute. Now your screen will go dark sooner when you put the phone down. A screen that stays on wastes power.
Check the Battery setting. Open Settings. Tap Device care. Then tap Battery. On some phones the first words are Battery and device care instead of Device care. That is the same place. On the Battery screen, look at the information shown there. Do not worry about every number. Just look for words like Power saving. That setting is explained in the next step.
Try Power saving when you need it. On the Battery screen, look for Power saving and tap it. Read what it says on your phone. Turning it on may make the screen a little less bright and may slow down some background work. Your calls and messages will still work. Turn Power saving on when you are out for a long day and you cannot charge your phone. Turn it off again when you are home and near a charger.
Turn off Wi-Fi when you are out and do not need it. Open Settings. Tap Connections. Tap Wi-Fi. Tap the switch to turn Wi-Fi off. Or swipe down from the top of the screen and tap the Wi-Fi picture to turn it off. When Wi-Fi is off, your phone will stop searching for networks. Turn Wi-Fi back on when you get home. Your home Wi-Fi is usually faster and uses less mobile data.
Turn off Bluetooth when you are not using it. Bluetooth connects your phone to things like wireless earphones or a car. If you are not using those things, you do not need Bluetooth on. Swipe down from the top of the screen. Look for the Bluetooth picture. If it is lit up, tap it to turn it off. Turn it back on only when you need your earphones or your car connection.
Close apps you have finished with, gently. Tap the small square button at the bottom of your screen, or swipe up from the bottom and hold for a moment, depending on how your phone is set up. You will see small pictures of apps you used recently. Swipe an app picture up, or tap the words that close all apps, if you see them. You do not need to do this all day. Doing it once in the evening is enough. Do not worry if one app stays open. That is normal.
Charge in a calm, normal way. Plug your phone in when the battery is low. Use the charger that came with your phone, or a charger you trust. You do not need to wait until the battery is at zero. You do not need to charge it to a magic number. Unplug it when it is charged, or leave it plugged in overnight if that is your normal habit and your phone maker says that is fine for your model. Keep the phone out of strong heat, such as on a sunny window sill, while it charges.

Try it slowly: Rosa and a long shopping day

Rosa tried the changes one at a time. First, she turned her brightness down a little. The screen still looked clear. Next, she set her screen to turn off after 1 minute. At first she found it a little quick, so she changed it to 2 minutes. That was fine for her. She did not have to keep the shortest time. The best setting is the one you can live with.

On her next shopping day, Rosa turned on Power saving before she left home. She also turned Wi-Fi off while she was out, because the shops had no Wi-Fi she wanted to use. She made her calls, she took two photos, and she checked her messages. When she got home in the evening, her phone still had power left. Before, it had often warned her in the afternoon.

You can try the same slow test. Change the brightness and the screen time today. Try Power saving tomorrow when you go out. Notice what feels different. If a change makes your phone harder to use, change it back. There is no prize for the lowest brightness. Comfort matters. The aim is a phone that lasts through your normal day, not a phone that is hard to see.

Common mistakes

Turning the brightness so low you cannot read the screen. A dim screen saves power, but you still need to read it. Keep the brightness high enough to read with ease. If you strain your eyes, turn it up a little.
Leaving Wi-Fi and Bluetooth on all day, every day. Many people forget these switches. They stay on and keep searching. Check them once a day at first, until checking becomes a habit.
Setting the screen to stay on for 10 minutes. A long screen time feels easy, but the screen is the biggest user of power. A shorter time saves much more than most people expect.
Turning on Power saving and forgetting it is on. Power saving is useful for a long day out. If you leave it on for weeks, some things may feel slower. Remember to turn it off when you are home.
Downloading a battery app from the internet. You do not need one. The settings on your phone already do this job. Extra apps can show worrying warnings and ask for access to your phone. Do not install them.
Charging the phone in a hot place. Heat is not good for a phone while it charges. Do not leave it in direct sun, on a heater, or under a pillow while it charges.

Frequently asked questions

Will turning down the brightness harm my eyes?

No, if you keep it at a level you can read with ease. Do not make it so dark that you squint. In bright sunshine you may need it brighter. That is normal. Turn it up outside and down again indoors.

Will Power saving stop my calls or messages?

No. Your calls and messages should still work. Power saving mainly limits background work and may make the screen a little dimmer. If something feels different and you do not like it, turn Power saving off. Your phone will go back to normal.

Do I need to close every app, every time?

No. You do not need to close apps all day long. Your phone is made to keep some apps ready in the background. Closing one or two apps you have finished with, once a day, is enough. Do not spend your day closing apps.

Is it bad to charge my phone before it is empty?

No. You can charge your phone when it is low, or when it is half full. You do not need to wait until it turns off by itself. Plug it in when it suits you, and unplug it when it is charged.

Why does my battery still go down fast on some days?

Some days use more power. A long video call, a lot of photos, weak mobile signal, or very cold or hot weather can all use more power. That does not mean you did something wrong. Try the settings in this guide, and if the problem stays bad for many days, ask Samsung support for advice.

If the words on your screen look different

Galaxy phones come in many models, and the words on the screen can change a little from one phone to another. Your phone may say Battery and device care where this guide says Device care. It may say Adaptive brightness or Auto brightness. The order of items on the screen may also be different. That is normal, and it does not mean you are in the wrong place.

If you cannot find a setting, open Settings and use the search box at the top of the Settings screen. Type a word from the setting name, such as Battery, Display, or Wi-Fi. Tap the result that looks closest to what you need. The search box is the fastest way to find a setting when the words or the order look different because of your model, your region, your carrier, or your One UI version. Your phone may use One UI 8, One UI 8.5, or One UI 9, and the words can differ slightly between versions.