Ways to extend battery life of iPhone 5?

Any suggestions?

Lower the brightness level. Works or mac laptops too.

You can always buy the external battery phone case for the iPhone. It's gonna be costly, but it expands the battery life quite generously.

But, if you don't want to buy that case, just bring down the screen brightness. That helps a LOT.
Also, turn off your data or Wi-Fi when you arent using it. That also helps.

hm. If you double tap your home button, just close out all those apps that are open.

Turn brightness down
Turn Wi-Fi off
Turn Bluetooth off
Close apps that your not using
Charge only until battery is full (don't over charge)
Hope this helps, you can also get an app that will tell you what you can do to increase battery life.

Here are my tips:

1. Lower the brightness on your iPhone.
2. When putting your iPhone onto sleep mode, close all apps.
3. Don't put the phone on the charger for too long, or when it is full, this will "scar" the battery, decreasing it's life.
4.Turn off Wi-Fi when you aren't using it; it is a waste of energy.
5. Leaving Bluetooth on really drains the phone quickly, turn it off when you aren't using it.

Hope I helped!

Battery saving tips - http://www.gatorspit.com/tips/iphone-battery-save.html