If you'e lucky, your smartphone's battery can just make it through a full day, with the percentage meter dropping to the single digits as you finally get a chance to plug in. With 10 hours out and about, some handsets can't even last through dinner, though, and out of reach power outlets make juicing up at the restaurant a tad inconvenient. Beginning this summer, public power will be much more accessible in New York City. AT&T is partnering wi
