Ah ok my bad, some of them are quite "common" to sort out.
iCloud, turn that off, pointless to me really anyways.
Go to "Restrictions" and turn off "Ping".
Date & Time, turn off "Set Automatically".
Turn off Siri and "Raise to speak".
In Location Services, scroll to the bottom to "System Services" and turn all of them off except for "Cell Network Search" & "Compass Calibration".
Turn off Notifications that you don't use.
Go to Facebook and turn off some of the "Push Notifications".
Put "Brightness" to under half (this actually made a decent difference for me, I have mine at 1/4).
Turn off "Vibrate", at least in Normal mode I do.
Also, do a full restore to completely get rid of somethings that may be draining deep in the background, this helped me.
Set the phone up as new, but restore the phone from iTunes not iCloud.
Bluetooth off.
Auto lock to 1 minute.
Hope this helped, this was off the top of my head, i'll add to this later.