Meet the first cell phone that needs no battery to make calls

Ever since Martin Cooper, a senior engineer at Motorola, called the rivals from Bell Labs on April 3, 1973 to tell them he is speaking via the first mobile handset, those puppies have had one thing in common - the need to be powered by a battery pack. The first cell phone weighed about three pounds, and gave you just 30 minutes of talk time for roughly 10 hours needed to arrive at a full charge.

If you had to pick one device to make battery-free, what would you pick?Today, we are way ahead in those numbers, as fast-charging technologies have brought juicing down to ...