EV maker Polestar has announced that it’s bringing bi-directional charging — the ability for an electric car to be tapped as a battery for your home or the grid — to Polestar 3 owners who live in California. The feature is one of several ways EV owners can save money with their electric car, by either using less energy overall, or receiving credits for providing their excess power to the grid. Polestar’s bi-directional charging feature uses direct current, according to the compan...