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Disable location-related system services
Location services use GPS for location-aware apps and services. While it's useful knowing where you are on Google Maps, what you don't see is what is going on behind the scenes. Ads are being displayed based on your location, and traffic data is updated — meanwhile, your iPhone is always pinging out to see where you are to keep an eye on which time zone you're in. All of these things are unnecessary and churn up your battery life.
Go to Settings > Privacy > Location Services. When On, scroll down to System Services, then uncheck all of these items. When you're not using Location Services, such as GPS, then simply turn it Off. (You can't, however, disable Location Services as quickly as other items from the swipe-up Control Center. You have to perform this switch manually.)