Why don't they rent (instead of selling) the batteries, and have stations to swap your battery for a full one before recharging the empty one at their leisure? That could take the "refuel" time down to a minute!
an image: http://4.bp.blogspot.com/-AnwyDQUET2I/T6dyawydsqI/AAAAAAAAAG...
"In early October 2012, Agassi resigned from his role as worldwide Better Place CEO, and was replaced by Evan Thornley, CEO of Better Place-Australia. Briefly, Agassi remained on the company board, but a week later he resigned from that position as well. A few days after Thornley's appointment, Better Place asked its investors for a round of emergency funding, totaling about $150 million.[8][9] On October 11, 2012, Haaretz reported that Better Place might lay off up to half its staff of several hundred employees.[10] On October 29, 2012, Ynet reported that Better Place would that week lay off 150 to 200 people out of its 400-person staff in Israel as it seeks financing to combat its cash-flow problems.[11] In late January 2013, Thornley resigned, and Dan Cohen was named acting CEO by the board.[12]"