By David Shepardson

WASHINGTON (Reuters) -Workers at a General Motors-LG Energy battery cell factory in northeast Ohio overwhelmingly voted to join the United Auto Workers, a big win for the union seeking to organize the growing electric vehicle supply chain sector.

The National Labor Relations Board said hourly employees at the Ultium Cells LLC plant near Cleveland voted 710 to 16 in favor of joining the union.

Ultium said it respected "the decision of our Ohio workforce supporting representation by the UAW. We look forward to a positive working relationship with the UAW."

The closely watched vote was a crucial test of the UAW's ability to organize workers who make parts for electric vehicles. The Detroit Three automakers all have battery plants in the works with South Korean partners.

The UAW may face more opposition at plants in southern states that are less unionized than Ohio.

The UAW petitioned in October to represent about 900 workers at the Ohio plant after a majority of employees signed cards authorizing the union to represent them.

"As the auto industry transitions to electric vehicles, new workers entering the auto sector at plants like Ultium are thinking about their value and worth," UAW President Ray Curry said Friday. "This vote shows that they want to be a part of maintaining the high standards and wages that UAW members have built in the auto industry."

In a trip to South Korea in May, President Joe Biden expressed support for workers seeking to unionize JV battery plants and previously prodded the Detroit Three automakers to "deepen your partnership with the UAW."

Democratic Senator Debbie Stabenow said on Twitter the vote was "great news. We are not only bringing jobs home to America, they are good-paying union jobs!"

Production began in August at the Ohio plant, the first of at least four planned Ultium U.S. battery factories.

GM and LG Energy are considering an Indiana site for a fourth U.S. battery plant. They are building a $2.6 billion plant in Michigan, set to open in 2024. Last week, Ultium said it would boost its planned investment in a $2.3 billion Tennessee plant by another $275 million.

In July, the U.S. Energy Department said it intended to lend Ultium $2.5 billion to help finance new manufacturing facilities. Sources told Reuters the loan could be finalized as soon as next week.

Last week, GM Chief Executive Mary Barra expressed support for unionizing the Ohio plant. Barra told reporters Thursday she wanted to get a labor agreement as soon as possible if Ohio workers voted in favor and said "I don't think it's a foregone conclusion that if you're union you're more expensive."

(Reporting by David Shepardson; additional reporting by Joseph White in Detroit; Editing by Shri Navaratnam, Bradley Perrett and Anna Driver)

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