Any tips to extend iPhone battery life?

Since I've updated with IOS7 the battery life on my iPhone has been terrible!
I'll barely use it and it sits in my handbag and by lunch time it will be at 30%!
does anyone have any tricks to make it last longer?

Get an app that saves battery life.
type in Batter saver and many apps pop up.

Turn your brightness down or get a case that has a charging port like this one ---> http://www.amazon.com/...2tadrkcw_b Hope this helps!

These other answers don't seem to be helping at all. :l I really recommend these tips: (Not alot of tips)
Turn Your Brightness down
When your going to charge your phone put it on airplane mode which will make it charge twice as fast.

You can turn your brightness down, close unused apps, put your phone on airplane mode if not using it, turn Wi-Fi off, turn bluetooth off, turn 4g off and also try not to watch movies or play games as they tend to drain your battery.

Maybe iOS 7 will run some extra but useless apps on your iPhone. You can check the apps running on your iPhone and shut down some useless apps. Turn down the screen brightness and enable the power saving mode.
More tips, you can click the link from the link.