GM is projecting that its second-generation Ultium packs, expected mid-decade, will cost 60 percent less than the batteries in use today with twice the energy density expected. (Photo by Steve Fecht for General Motors)

GM is projecting that its second-generation Ultium packs, expected mid-decade, will cost 60 percent less than the batteries in use today with twice the energy density expected. (Photo by Steve Fecht for General Motors)