Maybe the controller circuits to manage these batteries will become more generally available and scaled for home use. We can only hope. https://www.wsj.com/articles/ old-electric-vehicle- batteries-are-getting-a- second-life-11655114401 Millions of electric vehicles will be scrapped in the coming years. For the batteries that power them, that won’t be the end of the road. Eventually, auto makers and recycling companies want to harvest valuable materials from old EV batteries to make new ones. But before they are recycled, used batteries could be given a second life on the electricity grid. Old Electric-Vehicle Batteries Are Getting a Second Life Auto makers like Nissan and Renault are using retired batteries to build large-scale energy-storage systems A grid-storage unit in West Sussex, U.K., part of a project from Renault SA and Connected Energy using second-life EV batteries from Renault vehicles. PHOTO: CONNECTED ENERGY By Dieter Holger and...