As a power bank, the Power Drum carries a 3000mAh battery, well short of the 10000-20000mAh banks that are available these days. Still, in a pinch, you’ll be glad to have that extra battery life. What you might not be pleased with is the microUSB port used to charge up the Power Drum. That means carrying around an extra cord with you.
According to one of the sources, it appears that AT&T will be selling the Power Drum for $99.99. There is no word yet on when this product will be officially launched.