2.5MJ/automobile battery <http://en.wikipedia.org/wiki/Energy_density>
1 hour at 107 horsepower <http://www.plasmerg.com/_files/Cert.pdf> 2.6MJ/battery;1hour;107hp?battery <http://www.testardi.com/rich/calchemy2/> ([{2.6 * (mega*joule)} / battery]^-1 * [1 * hour]) * (107 * horsepower) ? battery = 110.47821 battery
