The Skype for Android app runs in the background without taking up battery power, so you don’t need to sign out – but if you want to, you can.
To sign out of Skype for Android:
You’re signed out of Skype. Next time you open Skype, you can choose to sign back in quickly with a saved password, or tap Sign in with a different account.
If you don’t want Skype to save your password and speed up the sign-in process, you can turn this feature off:
You'll be prompted to enter your password each time you sign in to Skype.
If you press the Home button on your phone to close Skype, it will continue to run in the background without draining the phone’s battery. Skype will notify you of any calls and 1:1 instant messages so you don’t miss anything.
You won’t be notified of any group instant messages unless you choose to switch on group notifications. This will use a little more of your battery’s power. You’ll find the option to sync group messages in the Notifications area of Skype settings. To learn more, see our guide to managing notifications on Android.