This Self-Teaching Battery Sifter Sorts Cells Solely by Sight

Nickel-cadmium and lithium-ion batteries can't simply be thrown away—their dangerous heavy metal contents could leak and contaminate the environment. Problem is, batteries have to be sorted by size and type before being recycled, which is both labor-intensive and time-consuming. Luckily, this high-speed battery… » 12/21/12 11:30am 12/21/12 11:30am