Amprius Introduces SiCore®500 – High Energy Density Cells for Unmanned Aviation

Amprius Introduces SiCore^®500 – High Energy Density Cells for Unmanned Aviation

Second-generation SiCore reaches 500 Wh/kg on conventional lithium-ion manufacturing equipment; commercial availability expected in Q4 2026

FREMONT, Calif.–(BUSINESS WIRE)–Amprius Technologies (“Amprius” or the “Company”) (NYSE: AMPX), a leader in silicon anode lithium-ion batteries, today announced a new 500 Wh/kg SiCore^® cell, designed for long-endurance aviation. The cell delivers 500 Wh/kg at a 1C continuous discharge rate and can be produced on conventional lithium-ion battery manufacturing equipment.

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Reaching 500 Wh/kg has typically required specialized materials handling and non-standard cell construction. Second-generation SiCore is designed to reach the 500 Wh/kg mark on standard equipment, processes, and cell formats already installed across Amprius’ global contract manufacturing network. That is intended to give customers a path from qualification to volume with no specialized tooling and to give Amprius a way to extend its highest-performing tier without departing from its asset-light manufacturing model.

Amprius has reached and exceeded 500 Wh/kg before, but those cells relied on specialized processes and were never produced at commercial volume. Second-generation SiCore is the first Amprius platform designed to reach the same energy on conventional manufacturing infrastructure.

The new SiCore cell is optimized for the sustained, low-rate discharge profiles required for High-Altitude Platform Stations (HAPS), fixed-wing drones, and other long-endurance applications. In HAPS, stored energy and battery weight decide whether persistent stratospheric flight is possible: fixed-wing platforms bank daytime energy to fly overnight, while lighter-than-air platforms draw on it for propulsion and station keeping. Higher specific energy can add flight time, range, and payload without adding weight.

Amprius has supplied cells for AALTO HAPS since 2018 across multiple generations of the Zephyr platform, including a 2025 flight that has reported setting a 67-day world endurance record. AALTO, an Airbus subsidiary, is developing 100% solar-electric HAPS for connectivity and earth observation applications.

“Energy density is fundamental to Zephyr’s endurance,” said Pierre-Antoine Aubourg, COO at AALTO HAPS. “Our longstanding relationship with Amprius has focused on advancing the energy storage required for persistent stratospheric flight. Continued gains in specific energy can meaningfully extend flight duration and expand mission capability.”

Amprius designed the second-generation SiCore platform to close the gap between demonstrated energy density and what customers can order at volume.

“Reaching 500 Wh/kg is a significant technical milestone, but how we reached it matters as much as the number,” said Dr. Ionel Stefan, CTO of Amprius Technologies. “By achieving that performance level on conventional manufacturing equipment, our aviation customers can qualify this cell knowing that we have designed a cost-effective, scalable path to volume behind it.”

Amprius currently expects commercial availability in Q4 2026, with cells built in customer-specific formats and in the standard small uncrewed aircraft systems (sUAS) pouch format defined by SAE JA1016. Initial production is planned at the Company’s Fremont, California facility, with volume production expected to scale through existing global contract manufacturing partners.

For more information, please visit the Amprius investor relations website at ir.amprius.com.

About Amprius Technologies, Inc.

Amprius Technologies, Inc. is a leader in advanced lithium-ion battery technology, delivering high-energy and high-power silicon-anode batteries with up to twice the energy density, range, and flight time of conventional graphite-based cells. Headquartered in Fremont, California, Amprius operates an R&D lab and pilot manufacturing facility for silicon anodes and cells. To support scalable production, the Company employs a contract manufacturing strategy, enabling rapid capacity expansion with minimal capital investment. Committed to driving innovation in energy storage, Amprius powers next-generation applications in aerospace, defense, and mobility. For additional information, please visit amprius.com and the Company’s LinkedIn page.

About AALTO

AALTO pioneers Stratospace for a more resilient and sustainable world. Based in Farnborough, UK, the Company is an Airbus subsidiary that was created in 2022 to develop, manufacture, operate, and deliver services with its solar-powered, Stratocraft: Zephyr. Zephyr’s persistence enables continuous flight for months at a time, with a current flight-time record of over 67 days in the stratosphere. As part of a multi-domain ecosystem, AALTO can deliver several applications to commercial and government customers, including direct-to-device connectivity and high-resolution Earth observation.

Forward-Looking Statements

This press release includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, Section 21E of the Securities Exchange Act of 1934, and the “safe harbor” provisions of the United States Private Securities Litigation Reform Act of 1995, each as amended, including Amprius’ expectations, hopes, beliefs, intentions or strategies regarding the future. Forward-looking statements may be identified by the use of words such as “estimate,” “plan,” “project,” “forecast,” “intend,” “expect,” “anticipate,” “believe,” “seek,” “will” or other similar expressions that predict or indicate future events or trends or that are not statements of historical matters. These forward-looking statements include, but are not limited to, statements regarding the expected commercial availability of second-generation SiCore cells in the fourth quarter of 2026; the expected performance, energy density and benefits of such cells; the ability of Amprius to produce such cells using conventional lithium-ion manufacturing equipment, processes and cell formats and to qualify and scale volume production through its existing contract manufacturing partners; the planned initial production of such cells at the Company’s Fremont, California facility; the anticipated benefits of such cells to customers, including extended flight time, range and payload; the capacity of Amprius’ contract manufacturing partners with respect to Amprius’ batteries; Amprius’ ability to meet customers demand with contract manufacturing capacities; and the potential application and performance of Amprius’ batteries. These statements are based on various assumptions, whether or not identified in this press release, and on the current expectations of Amprius’ management and are not predictions of actual performance. These forward-looking statements are not intended to serve as, and must not be relied upon by any investors as, a guarantee, an assurance, a prediction or a definitive statement of fact or probability. Actual events and circumstances are difficult or impossible to predict and will differ from assumptions. Many actual events and circumstances are beyond Amprius’ control. These forward-looking statements are subject to a number of risks and uncertainties, including market demands for Amprius’ batteries; the risk that the energy density, cycle life, safety and other performance characteristics achieved by Amprius in testing or in limited quantities are not replicated in cells produced at commercial volume, in customer-specific formats or under actual operating conditions; the risk that increases in energy density involve trade-offs in cycle life, safety or other performance characteristics that customers find unacceptable; the ability of Amprius to execute its business model and strategy, including the ability to expand manufacturing capacity or develop production lines that meet its requirements, deliver high performance products to customers at acceptable prices; the effect of macroeconomic factors, such as tariffs, trade barriers, retaliatory actions imposed on Amprius’ partners and suppliers, including regulatory developments proposed in China, abrupt political change, geopolitics, currency fluctuations, embargoes, shortages, terrorist activity, armed conflict and public health emergencies, on Amprius’ business; third-party producers of Amprius batteries continuing to produce such batteries in the expected quantities and caliber and at the expected prices; the length and outcome of customer qualification, testing and design-in processes for new cells, and the risk that those processes do not result in production orders; risks related to the rollout of Amprius’ business and the timing of expected business milestones; the risk of delays in the commercial availability of new products, including second-generation SiCore cells; the effects of competition on Amprius’ business; Amprius’ liquidity position and its ability to raise additional capital; the possibility that Amprius may be adversely affected by economic, business or competitive factors and may not be able to manage other risks and uncertainties; changes in governmental policies impacting Amprius’ customers and addressable markets; and changes in other domestic and foreign business, market, financial, political and legal conditions. More information on these risks and uncertainties that may impact the operations and projections discussed herein can be found in the documents Amprius filed from time to time with the SEC, all of which are available on the SEC’s website at www.sec.gov. If any of these risks materialize or Amprius’ assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements. There may be additional risks that Amprius does not presently know or that Amprius currently believes are immaterial that could also cause actual results to differ from those contained in the forward-looking statements. In addition, forward-looking statements reflect Amprius’ expectations, plans or forecasts of future events and views as of the date of this press release. These forward-looking statements should not be relied upon as representing Amprius’ assessments as of any date subsequent to the date of this press release. Accordingly, undue reliance should not be placed upon the forward-looking statements. Except as required by law, Amprius specifically disclaims any obligation to update any forward-looking statements.

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Amprius Contacts:

Investors

Tom Colton, Greg Bradbury

Gateway Group, Inc.

949-574-3860

[email protected]

Media

Zach Kadletz, Brenlyn Motlagh

Gateway Group, Inc.

949-574-3860

[email protected]

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Second-generation SiCore cell reaches 500 Wh/kg on conventional lithium-ion manufacturing equipment; commercial availability expected in Q4 2026.

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