Samsung Galaxy S21 Ultra
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My phone's battery life is short
Solution 14 of 15: There are too many running applications
Some applications aren't ended completely when you return to the home screen. If you don't end them from the list of running applications, they keep running in the background which may slow down your phone.
Press the Application key.
To end one running application, slide your finger upwards on the required application.
To end all running applications, press Close all.