Now,you will need a common nine-volt battery and a metal piece of money.

VOA: special.2010.12.08

"The one-time cost of our system which consists of a small solar panel, a little motorcycle-sized battery and a couple of LED lamps, is less than one hundred dollars,"

VOA: standard.2009.12.13

"Two-point-four billion dollars in highly competitive grants to develop the next generation of fuel-efficient cars and trucks, powered by the next generation of battery technologies all made right here in the U.S.of A,"

VOA: standard.2009.08.05