GM Exits Battery Joint Venture, Samsung SDI Buys Remaining Stake

August 14, 2026

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Key Takeaways

  • Samsung SDI acquired GM's 49.99% stake in the SynergyCells joint venture in New Carlisle, Indiana, announced August 11, giving the company its first independently operated battery production base in North America.
  • Samsung SDI attributed the ownership change to market changes since the joint venture was announced, specifically the slower-than-expected growth of EV demand, and said the partners will pursue cooperation outside the joint venture structure.
  • The plant is under construction. Once complete, it will begin by producing energy storage system batteries rather than EV cells, which Samsung SDI framed as a response to U.S. storage demand.
  • The companies signed a separate agreement to co-develop a next-generation prismatic cell with high energy density and fast charging for potential future EV applications, which could eventually be produced at the Indiana plant.

Samsung SDI has acquired General Motors’ 49.99% stake in SynergyCells, the joint venture the two companies established in New Carlisle, Indiana, and has signed a separate agreement with GM to jointly develop a next-generation prismatic battery cell for potential future electric vehicle applications.

The ownership change was made in consideration of market changes since the joint venture was announced, including the slower-than-expected growth of EV demand, and that the two partners have decided to seek other forms of cooperation outside the joint venture structure.

Acquiring the stake gives Samsung SDI its first independently operated battery production base in North America. The company said it plans to use the plant to produce high-tech batteries for a range of applications.

The plant is currently under construction. Samsung SDI said that once it is completed, the facility will begin by producing batteries for energy storage systems, a response to the growing market in the U.S. Under the development agreement, the two companies will co-develop prismatic batteries with high energy density and fast charging capability.