An engineer demonstrates the assembly of a battery after the Urban Electric Power ribbon cutting ceremony, Tuesday, Aug. 6, 2013, in New York. (John Minchillo / AP Images for Urban Electric Power)

Associated Press
An engineer demonstrates the assembly of a battery after the Urban Electric Power ribbon cutting ceremony, Tuesday, Aug. 6, 2013, in New York. (John Minchillo / AP Images for Urban Electric Power)
An engineer demonstrates the assembly of a battery after the Urban Electric Power ribbon cutting ceremony, Tuesday, Aug. 6, 2013, in New York. (John Minchillo / AP Images for Urban Electric Power)
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