"Improve Battery Life on Nokia Lumia Windows Phones with AMOLED"
Search on youtube.
I just saw the video and thought of posting it here...
As the Lumia 930 has an AMOLED screen, these simple tips should help a lot.
I think the phone uses more battery when it has to constantly shift between network bands.
Also, most of the times if you are in the office or home, and where wifi is easily available, i would prefer to switch off the data on the phone, as data uses good amount of battery.
I am getting a Lumia 930 very soon. Thats the reason i was reading through the forum.