Amprius Technologies, Inc.

What the company does

Amprius develops, manufactures, and markets lithium-ion batteries for mobility applications, with a primary focus on aviation (including unmanned aerial systems and high-altitude platforms), ground vehicles, and marine devices. Its proprietary silicon anode technologies, SiCore and SiMaxx, are designed as drop-in replacements for graphite anodes in traditional lithium-ion cells and are compatible with existing battery manufacturing processes and supply chains. The company primarily serves aviation markets (UAS, HAPS, eVTOL) and is expanding into light electric vehicles and other electric transportation segments.

Technology and product platforms

SiCore product platform

• SiCore cells are available in pouch, cylindrical, and prismatic formats.
• Design profiles:
  • High Energy: up to 450 Wh/kg and 950 Wh/L; up to 1C charge; cycle life up to 1,400 cycles.
  • High Power: up to 360 Wh/kg and 800 Wh/L; up to 10C; cycle life up to 200 cycles.
  • Balanced Energy/Power: up to 340 Wh/kg and 770 Wh/L; up to 3C; cycle life up to 700 cycles (or up to 1,000 cycles at roughly 90% depth of discharge).

SiCore Generation 2

• Announced January 2025. Energy density of 360 Wh/kg, power up to 3,000 W/kg, and fast-charging capability up to 10C without cooling and up to 15C with active cooling.

SiMaxx generation

• Uses nanowire architectures to accommodate silicon expansion during charging.
• Formats and performance: 18650 up to 4 Ah; 21700 up to 6.5 Ah; cycle life up to 500 cycles.
• Early-stage demonstrations include a prototype cell exceeding 500 Wh/kg and 1,300 Wh/L at 25°C.

EV-capable cells

• Development activity includes participation in USABC testing. SiMaxx A-sample EV cells have demonstrated 360 Wh/kg at beginning of life, 1,200 W/kg power, and delivery of 90% of energy in 15 minutes under defined conditions.

Customers and market validation

• More than 500 customers had tested or validated SiCore/SiMaxx batteries as of 2025.
• In 2025, shipments were made to hundreds of customers; one customer accounted for $27.1 million of revenue in 2025.
• Longstanding design validation and relationships with aerospace and defense entities, including Airbus AALTO, AeroVironment, BAE Systems, Kraus Hamdani Aerospace, Nokia Drone Networks, Nordic Wing, Teledyne FLIR, and the U.S. Army.
• Total battery cells shipped since inception through December 31, 2025: over 4.2 million.

Manufacturing, supply, and scale

• Outsourced manufacturing model using global contract manufacturers; participant in the Amprius Korea Battery Alliance consortium to scale production.
• Access to annual SiCore production capacity exceeding 2.0 GWh in pouch, cylindrical, and prismatic formats through contract manufacturers.
• Exclusive supply arrangement with Berzelius Co., Ltd. for silicon anode materials in the U.S., Canada, and Mexico.
• DIU-funded expansion: a $14.8 million defense-related contract established in 2025 to accelerate SiCore pilot-line capabilities.
• Fremont, California facility (SiCore pilot line) planned expansion to 10 MWh to support quick-turn prototypes.
• Brighton, Colorado lease (774,000 sq ft) was terminated in January 2026; the company recorded an impairment charge of $19.1 million related to the right-of-use asset and construction-in-progress and made a one-time termination payment of $20.0 million.
• In January 2026, announced a U.S. contract-manufacturer partnership with Nanotech Energy (California) to broaden U.S. manufacturing capabilities.

Intellectual property

• As of December 31, 2025: 86 patents owned (74 issued, including 35 issued in the U.S. and 39 issued across the EU, Korea, Japan, China, Taiwan, and Israel), 10 pending applications, and 2 U.S. patents licensed from Stanford University.
• Patents cover silicon structures (nanowire-based architectures, tapered morphologies, multi-layered structures), materials technologies (electrolyte formulations, SEI formation, prelithiation), and silicon-anode manufacturing processes.

People and corporate information

• Employees: 109 total as of December 31, 2025 (97 full-time; 12 temporary/contractors).
• Headquarters and primary operations in Fremont, California, with significant R&D and manufacturing staffing concentrated there.
• Public company incorporated in Delaware with standard governance and forum-selection bylaw provisions.

Financial snapshot

• One customer represented $27.1 million of revenue in 2025.
• The company has incurred net losses since inception and expects continued operating expenses.
• Shipments and capacity indicators: more than 4.2 million battery cells shipped through December 31, 2025; annual SiCore production capacity greater than 2.0 GWh via contract manufacturers.
• Capital commitments and lease-related charges include the Brighton impairment charge ($19.1 million) and the $20.0 million lease termination payment in January 2026.

Strategic elements

• Early positioning in aviation-grade silicon-anode batteries with long-duration validation, including Zephyr S endurance records with Airbus.
• Growth strategy emphasizes rapid capacity expansion through contract manufacturing partnerships rather than large internal capital expenditures.
• Ongoing investment programs target improvements in energy density, power, cycle life, and form-factor flexibility to address UAS, eVTOL, LEV, and broader electrified transportation markets.