Mophie

I am constantly on my phone throughout the day.  Maybe it's because I have 3 kids ages 3 and under and I don't get out much...but it is my only contact with the real world!  I was having to charge my phone 1-2 times a day.

Then I found - the Mophie Iphone Battery Pack.

This pack gives you twice the battery life.  It also serves as a nice protection case for your phone and comes in a variety of fun colors.

I usually buy mine from Verizon as I can get a warranty, but they are cheaper on Amazon.