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Switch from 'push' to 'fetch' email
Push email is very useful for when you're running against the clock. Emails are downloaded automatically and instantly from the server when they arrive, rather than waiting for you to send and receive. But if you don't mind waiting that long, you can reduce the download cycle so your iPhone isn't constantly listening for new email. Instead, it will run a schedule every few minutes, which ultimately helps in conserving the battery life.
Go to Settings > Mail, Contacts, Calendar, then scroll down to Fetch New Data. From here, disable the Push option. After this, scroll down and set the fetch schedule to Every 15 minutes so that it runs the "send and receive" schedule every quarter-hour. If you need certain email accounts to push email to your device, select Advanced and confirm the setting for each separate account.