There is a ton of competition in the external battery pack space. You can get a ruggedized brick for your Xtreme adventures, a cute little pocket-sized charger for a quick hit of juice in the car or on the go, and even an iPhone-wrapping battery pack that gives you even more storage space than you might need.
I live a portable, electronic-powered life, carrying iPhones, iPads, e-Readers, and portable gaming devices with me at all times. Most of these things are power-hungry, forcing me to keep my eye open for wall plugs, or to carry external power packs that can handle the energy load.
So what does a battery pack need to do to set itself apart from the crowd, claiming the scarce space in my backpack or messenger bag? It has to be quick to charge, easy to use, small, light and pretty to look at, for starters. And it really should have a lot of spare power to keep all my devices rolling.