What's the best setting for iphone 4 to increase battery life?

What's the best setting for iphone 4 to increase battery life?

-turn brightness level to a low point under halfway mark
-keep the iphone out of sunlight (the sun energy drains the battery life)

for more info about how to save battery download "boost magic" (free) on the iphone. It gives you tips and techniques of how to save battery and also tells you how much battery and how long you have left. It also tells you about how much battery/time each app uses

That brightness setting and, I'm trying to remember what settings these are, but you can turn off different things until you need them like searching for Wi-Fi signals and such.