FILE- In this Nov. 4, 2016, file photo, a Chevrolet Bolt EV battery pack is removed for testing after undergoing charging and discharging cycles at General Motors Warren Technical Center's Advanced Energy Center in Warren, Mich. If U.S. consumers ever ditch fuel burners for electric vehicles, then the United Auto Workers union is in trouble. Gone would be thousands of jobs at engine and transmission plants across the industrial Midwest, replaced by smaller workforces at squeaky-clean mostly automated factories that mix up chemicals to make batteries. (AP Photo/Duane Burleson, File)
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