DigiPower has introduced its new ChargeCard battery pack for the iPhone, iPod, and other USB-charging devices. Touted by the company as a credit card-sized, wallet- and purse-friendly charger, it features a 720mAh battery which DigiPower claims is good for two extra hours of talk time, weighs just 1.2 ounces, and measures just 1/4” thick. No pricing or release information has yet been announced.