A new startup offers owners of electric vehicles a charging service wherever they are. The company has created an app that might just rid EV drivers of the anxiety that their cars might run out of power without having a charging point nearby. Should you be low on power, all you have to do is fire up the app and provide your location. Then someone will come to the location to deliver a backpack-size battery that will charge the car quickly at a price of $20 per 100 miles of running time.