The Duracell Power^FM package is a simple lithium-ion battery expander for your iPod nano or video. It will easily double the battery life for your device, but includes a few cool features that set it apart from similar products in the market already. As per its name, it includes an integrated FM transmitter, that allows you to specify which frequency you wish to transmit on. It also includes a pass-through dock and headphone port on the bottom of it, so you can still use other iPod accessories or charge it in a normal charger/docking station (if its able to accommodate the extra depth). Oh, and they throw in a silicone case for the hell of it, to keep your nano shiny and fresh. My only real gripe with the design is that its emblazoned with DURACELL’s copper-top logo, both on the front of the device itself, and on the FM configuration screen itself. It seems to detract a bit from the cool, minimalistic Apple approach, while turning you into a walking battery ad at the same time. Still, integrating FM transmission into a significantly expanded battery life for just $79 is a nice touch. Available now.