Preserving Battery Life
Battery draining is a very common issue. There are several steps you can take to ensure your battery life is not draining at a rapid rate.
Background App Refresh
Go to your device's Settings> General> Background App Refresh. You can choose to disable this for all apps. Or select individual apps to disable.
Allowing this feature to be enabled for some apps may improve your user experience, this may also drain your battery. To disable this feature simply go to Settings> Privacy> Location Services. Change the option to Never, Ask Next Time or While Using the App.
Look for apps that take a large amount of battery by going to Settings> Battery> Show Activity. There may be older apps that you no longer use that may be deleted to help with battery health.