How to save Battery Life on your iPhone

Did a little quick research and found loads of info [the title above is a good search term] but here's a synopsis:

Saving Battery Life on the iPhone - notes from articles [2/2/12]

<http://ipod.about.com>

1. Go to Settings and adjust what you can to limit the constant operation of the iPhone [fetch, don’t push, mail;  turn off Location Services not needed, etc.].  In iOS5 & the 4S, there are other Location settings you can adjust.  turn on auto-brightness or reduce screen brightness
   1. turn off Bluetooth, 3G or Wi-Fi, if not needed.  Usually turning off Bluetooth is not a major issue but unless you’re away from 3G or free Wi-Fi, the other two may need to remain on.  Turn on Airplane Mode if you want all connection off.
   2. avoid using battery hogs:  videos, games and Siri, sometimes.

 <http://www.huffingtonpost.com>

1. Some of the above 
2. Turn off Notifications you don’t need and turn off Push Notifications especially.
3. Close your Background apps - to multitask, Apps you’ve opened remain open and available [quick two-taps on Home button shows them across the bottom of the screen] - every now and then go in and turn them off by clicking the little red dash.  
4. There are other tests and possibilities you can find out at the Genius Bar.