5) Disable automatic updates of emails and calendar
There are very few people who have to respond to an e-mail immediately after they arrive. For many, monitoring their inbox 2 or 3 times a day is more than necessary. You can disable these automated e-mail notifications and save less memory to this device. Under “Settings,” go to Mail> Accounts and select Find new data and tap your e-mail account and select Manual to get the best results from the battery.