Most of the time I carry a lightning cord in my bag because I just plough through my iPhone's battery. What a pain, right? But iBattz's new Mojo Refuel charging case will let me leave the cable at home where it belongs, because it comes with two extra 2500mAh batteries.
The batteries fit into the back of the case, which has a lightning dock. When your phone's snapped in, it's juicing up. Mojo Refuel ships at the end of February. It costs $US90, and it will keep you from being that arsehole who's always carrying around a cord.