This just in: your iPhone (and iPad or iPod touch) is a marvel of engineering and does some amazing things, keeping you connected to the rest of the world with its super amazing technology. All that connectivity, though, can come with a price.
Push services are there to let you know when you have stuff to do, or emails to check. It’s pretty handy. However, when you need to conserve your battery, it’s probably time to turn them off. Here’s how, straight from Apple.
If you have a push mail account, like Yahoo! or Microsoft Exchange, turn push off when you don’t need it. Tap into Settings, then tap Mail, Contacts, Calendars. Next, tap Fetch New Data, and set the Push toggle to OFF. Now, emails that you get on your phone will come in based on the global Fetch settings, instead of right when they show up. You’ll need to hop into your Mail app to check them once in a while, too.
For Push Notifications, you’ll need to disable these in the Settings app as well. Tap open your Settings app, then tap Notifications. Your iPhone will list everything that has the ability to send you Push Notifications. Tap each app you want to manage the Notifications for, and then turn the Notification Center toggle to OFF. Then, set the ALert Style to None, the Badge App Icon and Sounds to OFF, and turn OFF the View in Lock Screen Option.
Another way to make this happen for all your apps is by turning Do Not Disturb ON manually.
Via: Apple Support