OrderBorder offers the Just Mobile Gum Plus 5,200mAh Power Pack for iPhone and iPod for $46 plus $8 for shipping. That's the lowest total price we could find by $17. This portable backup battery can be used for an iPod, iPhone, iPad, or any USB-powered device. It can charge an iPhone to 90% in one hour and up to three iPhones on one charge of its battery. It features a solid aluminium enclosure, micro USB and dock connector cable, five LED capacity indicators, and more. Deal ends May 25.