If you fancied that video or if just the current info about the smallest and most of all cheapest electric vehicle in the world is something that has stirred your curiosity, you might be interested to find out a few more details about the little bugger.It turns out that the smart fortwo ed will be just a tiny bit more expensive to lease than a regular, gasoline powered, fortwo. After shelling $1,999 as a down payment, US customers will only pay $139/month for 36 months for the privilege of parking almost anywhere and driving with zero-emissions.In other words, the car will end up costing about seven grand, which we realize sounds a bit preposterous when you think about it. There is, of course, a catch.The offer is available just for the basic, coupe-model, as the world's tiniest cabrio costs slightly more. The 139 bucks per month lease includes the Battery Assurance Plus feature, whose fee of $80 per month is included in the lease.Technically, the above feature means that customers will not own, but actually rent the Li-Ion battery from Daimler. Don't worry though, the offer also means that customers will get free battery maintenance checks and a ten-year replacement guarantee, no matter what happens with the battery.