Source: Forbes  [May 05, 2008]

SYNOPSIS: In order to drive 200 miles on just kilowatt-hours, your electric fuel tank needs 100 kWh, and every fill-up costs about $70 with today's technology when you count amortized battery capital costs.

Everyone wants his laptop, or smart phone, to run a week between recharges. Of course while playing a hi-def movie or surfing the Net, respectively.

Verizon Communications would like its cell towers to run at least a day, instead of minutes, during power outages. The military would like its slick but power-hungry communications and surveillance systems to run all night, whether on dismounted soldiers or stealthy armored vehicles.