4. Powercell 3000 by Ventev

Apple iPhoneHunt ValleyTESSCO Technologies Incorporated
Great smartphones like the iPhone have a nasty drawback: the better they are the more we use them; the more we use them the more we run out of battery. External power packs have been around for years, but products like Ventev Powercell 3000 are getting small enough to actually get widespread... Ventev