#7 – Maintain Your Email
This really depends on you and your usage of email. If email is not very important to you, change the option in your device from “Push” to “Fetch”. This will allow your phone to collect all the received mail at certain periods of the day, or manually done by you instead of showing you email every minute you receive one or in very frequent periods of the day, which consumes a large amount of battery life. You can also determine which time of the day you see to be the “peak of receiving mails” as the most suitable for you to retrieve mails. This type of organization also greatly preserves your iPhone battery life.