The United Auto Workers' next test for its southern automotive organizing effort starts Tuesday as hundreds of workers at Ford Motor Co.'s joint-venture electric vehicle battery complex are expected to vote on whether to join the Detroit-based union.

A loss for the UAW at the BlueOval SK Battery Park in Glendale, Kentucky, would be stunning, experts said, given its connections to the Dearborn automaker and that the state already has a number of UAW-represented plants.

But it's nonetheless important for the future of the union in light of industry expectations that EVs eventually will dominate vehicle sales, with batteries replacing the engines, transmissions and other parts many UAW members make today. Results from the vote overseen by the National Labor Relations Board are expected by T

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