HOW TO PRESERVE IPHONE BATTERY?

I need my phone all day tomorrow to take pictures so what settings should i turn off to make it last the longest? Low brightness? Airplane mode?

Press homebottom 2 times and delete all applications on you ram( nothing will be deleted from you phone though your jest deleting from youre ram) low brightness, turn of cellular data, you don't need to turn i of becaus if you just lock it yourehone will be n stand by mode, but ithink iphone battery has long battery so you can use it alot.

Please keep this follow

1. Disable as many notifications as possible
2. Turn off Location Services.
3. Check for email manually.
4. Watch your signal strength indicator.
5. Check for software updates
6. The old power-saving standbys still help
7. Consider a battery case or an add-on battery.