With that in mind, we want to try and fix the bad Samsung Galaxy S5 battery life for you. This guide delivers help to get better battery life on Samsung's current flagship. These fixes should work if you're on Android 4.4 KitKat or if you're on Android 5.0 Lollipop. We've geared this towards Android 5.0 Lollipop users but we know that plenty of people remain on the older version.
Find Apps Eating Up Your Battery:
Third Party Apps
The first recommendation that we always make is to check out your third-party applications. Third-party applications have a tendency to put a huge dent into the battery life on the Galaxy S5, regardless of the software that's currently running. If you use an application a lot, it's going to drain your battery.
Restart the Samsung Galaxy S5:
If you start noticing weird battery drain and or your device starts heating up, you should try performing a reset to see if that returns things to normal. Most of you know how to restart the Galaxy S5 but we'll remind you anyway. Hold down the power button, confirm that you want to turn it off, and then hold the power button down to turn it back on.
Disable Unnecessary Services:
If apps aren't the issue, it's time to start working on some of your habits. In our experience, disabling features when they aren't in use tends to have a positive impact on overall battery life. We recommend shutting off Wi-Fi connectivity when you don't need it, bluetooth connectivity when you don't need it, NFC when you don't need it, GPS when you don't need it, and cellular data when you don't need it.
Start Using a Black Wallpaper:
Switching to a black Samsung Galaxy S5 wallpaper can help deliver better Galaxy S5 battery life thanks to the way the Super AMOLED display on the Galaxy S5 consumes power. The device does not come with a default black wallpaper but you can search online for one. There are tons of them out there. After you've downloaded one, go to Settings -> Wallpaper -> Home and Lock Screens -> More Images -> set your black Galaxy S5 wallpaper.
Start Using the Device’s Built-in Features:
You'll also want to start using the Galaxy S5's built-in battery saving features. Power Saving Mode is a good place to start, and Ultra Power Saving mode is an even better option when you need the Galaxy S5 battery to last longer than normal.These features allow you to block background data and turn on grayscale mode which can help to limit the amount of juice being sucked up.
Replace Your Launcher:
If none of these fixes work, there are three other drastic solutions to try. The first is to replace the TouchWiz launcher on the Galaxy S5. The TouchWiz launcher has been known to hinder performance and it can be replaced. There are tons of different launches to choose from though the Nova Launcher is one of Android's most popular choices.
Downgrade to Android 4.4 KitKat:
If that doesn't work, you could try downgrading to Android 4.4 KitKat. A Verizon Galaxy S5 user recently put together a step-by-step process on how to move back from Android 5.0 Lollipop and those interested can find the instructions here. This isn't guaranteed to fix your issues but it's worth a shot if you don't want to wipe the device or if none of these fixes have an impact.
Factory Reset the Galaxy S5:
If you don't want to downgrade to Android 4.4 KitKat and you can't find any fixes for your battery problems, you can factory reset your Galaxy S5. This will wipe all of your files so you'll need to make a backup before going this route. To factory reset the Samsung Galaxy S5, go into Settings, User & Backup, and select Backup and Reset. From there, select Factory Data Reset. From there, select Reset Device and then Delete All.