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SK On Co., a South Korean battery manufacturer, is negotiating with a U.S. defense firm to supply batteries for AI-powered unmanned underwater vehicles, marking its entry into the defense sector. The company is also providing battery cells for a project by Hyundai Rotem Co. and is developing high-density NCM batteries, with plans for solid-state battery commercialization by 2029, although mass production is not expected until after 2028 due to certification delays.