<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54cb470648159_-_3d-batteries-01-0814-de.jpg>
<http://www.popularmechanics.com/science/energy/how-to/a11058/how-to-make-battery-power-more-powerful-17085182/>