Citra 2200mAh External Battery Case is fantastic as a short road trip battery. It's bigger than I want to carry when flying but is perfect for charging. Right now Citra has their Citra 2200mAh External Battery Case Power Bank for iPhone 5 5S (Mettalic Purple) for cheap price. You'll just need to visit the site.
Package Contents Include: Citra Battery case & User Manual *cables are NOT included* Specifications: Input/Output: DC 5V 500mA Capacity: 2200mAh Charging time: 5 hours Cell type: Li-polymer Battery Color: black, white Citra external battery case for iPhone 5 and 5s uses state of the art battery technology to extend the life of your phone for hours. It allows you to charge and sync your phone while refilling your battery at the same time. Installation is easy, simply take off the top cover of the battery case and slide your phone into the case. Press the ON/OFF button to activate or stop the charging.