GM Tests EV Batteries in Michigan to Lower Prices

General Motors is testing early electric-car batteries at its Battery Cell Development Center, a small test factory in Warren, Michigan, to make EVs cheaper. The 500,000-square-foot test line, shown in early September, mixes battery materials and coats parts, like a test kitchen perfecting recipes before mass production. Battery packs make up 30 to 40 percent of an EV's cost.