Technocel's original PowerPak (and Battery Boost) were both among our arsenal of gadgets used at this year's CES, and they proved incredibly useful for juicing up a dead MiFi or smartphone without having to remain tethered to an AC outlet. As you well know, we're pretty big fans of external battery packs, and it seems as if Technocel has addressed the one major gripe we had with the first-generation PowerPak. The Duo is essentially the same kind of gizmo, but with a lot more oomph and double the ports. It's a squared p
