Battery Saver reduces the amount of phone battery that the app uses. This is done by reducing the automatic check-in time from the default 2 minutes to 15 minutes. See the below guide on how to turn on Battery Saver for Android and IOS devices.
Android:
1. Go to the Settings page in the App
2. Turn the Battery Saver Toggle to On
3. Hit Enable on the Prompt
IOS (Apple iPhone):
1. Go to Settings page in the App
2. Click Battery Saver
3. Turn the Battery Saver Toggle to On