Amprius Technologies announced a new manufacturing partnership with California‑based Nanotech Energy, a company that has been producing advanced lithium‑ion cells since late 2024. The collaboration will allow Amprius to bring its high‑performance silicon‑anode SA128 cell— a 21700 cylindrical battery with 6.8 Ah capacity and 320 Wh/kg energy density—into U.S. production, creating a secure supply chain for defense and aerospace customers such as L3Harris.
The partnership adds capacity that could lift Amprius’ total annual output beyond its current 2.0 GWh contract‑manufacturing footprint in Asia. By leveraging Nanotech Energy’s California facility, Amprius can scale its SiCore platform without the capital expense of building a new plant, aligning with the National Defense Authorization Act’s emphasis on domestic battery production and positioning the company to meet growing demand from U.S. defense programs.
Amprius’ revenue has surged 234% over the last twelve months, driven by strong demand from defense and commercial drone markets. Despite this growth, the company faces significant profitability challenges, with analysts not expecting profitability this year. Amprius maintains a healthy balance sheet, holding more cash than debt and a current ratio of 6.65, which provides a cushion for continued investment in manufacturing and R&D.
CEO Tom Stepien said the partnership “is essential to meeting the evolving requirements of our defense customers.” He added that Nanotech’s deep expertise in advanced lithium‑ion cell manufacturing will enable Amprius to move quickly from development to production while maintaining the quality, security, and performance that customers demand. Nanotech CEO Curt Collar echoed this sentiment, noting that the collaboration “will design and produce the cells that are critical to the future of our country.”
The partnership strengthens Amprius’ competitive advantage in weight‑sensitive aerospace applications, reduces exposure to geopolitical supply‑chain risks, and accelerates the scaling of its silicon‑anode technology. With a robust cash position and a clear path to operational breakeven, the company is poised to capture additional defense and commercial drone contracts while continuing to expand its domestic manufacturing footprint.
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