HyperJuice offers a portable battery pack that you can haul around, plug into any wall socket, and use to charge two items at once (even two iPads at once!) with its dual USB ports. Shipping in a variety of eye-catching colors, as well as the basic black you see in the image at the top of this post, HyperJuice retails for US$129.95 (10.4Ah) and $159.95 (15.6Ah).
I was able to test out one of the lower capacity units and can report that it seems to work as advertised. Port access was just fine and the items charged as promised. I only had two complaints about the unit.
First, it weighs a bit -- about the weight of an iPad. It's perfect for bringing along in a car, or maybe a briefcase, but it weighed down my backpack
