Lynn Parsons of Kensington charging her Nissan Leaf on April 15, 2026. (Photo by Sam Gauntt/Capital News Service)By Razak Diallo For Lynn Parsons, knocking on a stranger’s door was once the difference between getting home or having her car hooked onto a flatbed truck and towed away. In 2014, the advertised 84-mile range of her Nissan Leaf was barely enough to get her from Washington, D.C., to Hagerstown, and it had just run out of juice in Potom…