Turn off notifications for apps you don't need...(settings>notifications)

Turn push off for mail, and set mail to fetch data at a set interval...(settings>mail,contacts,calendars>fetch new data)

Turn off unused iCloud features...(settings>iCloud)

Turn location services off when not used...(settings>locations services)

If using location services, turn off diagnostics and usage, setting time zone and location based iAds...(settings>location services>system services)

Use aeroplane mode when you don't need/want texts, calls or Internet connection, for example at night...(settings)

Use Wi-Fi more when available, as opposed to 3G...this may seem counter intuitive, but it works...if you don't use 3G and don't need Wi-Fi, switch it off! (settings>wifi)

Turn the brightness down...(settings>brightness)

Turn music EQ off...(settings>music>EQ)

Turn off Bluetooth...(settings>general>Bluetooth)

Set auto-lock to 1 minute...(settings>general>auto lock)

Once in a while (about every month), let your battery drain to near 1%, then charge to 100% without pause (may take a while). This will improve the health of the lithium ion battery

Make sure your software is up to date! Each update will aim to fix bugs and improve battery life! (settings>general>software update)

How to save battery life in ios

If your iOS device battery is less than optimal, try these few tweaks to maximise it! You may have to sacrifice some features, but it may be worth it! Any suggestions, please comment!