They have this, it is called a Mophie Juice Pack[1]. They have two sizes with different battery extensions. I miss the thinness of my phone without the case bu

They have this, it is called a Mophie Juice Pack[1]. They have two sizes with different battery extensions. I miss the thinness of my phone without the case but greatly prefer being able to get through a day in the data center or traveling without constantly charging my phone. 1: http://www.mophie.com/mophie-juice-pack-air-iPhone-4-4s-battery-case-p/1145_jpa-ip4-blk.htm http://www.mophie.com/mophie-juice-pack-air-iPhone-4-4s-batt...