The car was the result of a 10-month collaboration between Spark Racing Technology, McLaren Electronic Systems, Williams Advanced Engineering, Dallara and Renault.Lucas di Grassi was appointed as official test driver, demonstrating the prototype, the Formulec EF01 (built in 2010).[9] At the Frankfurt Motor Show, on 10 September 2013, the Spark-Renault SRT_01E was revealed by FIA president Jean Todt and Formula E Holdings CEO Alejandro Agag.The trial ended around 21 August with each team running all four of their cars completing a combined total of 1222 laps.[15] According to the regulations, the Formula E cars can be charged during practice, qualifying, the race and some other specified moments during a raceweekend.During races, power-saving mode will apply with the push-to-pass system temporarily allowing maximum power for a limited time.