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High Energy Density Silicon Anode Li-ion Batteries for UAVs United States of America
High Energy Density Silicon Anode Li-ion Batteries for UAVs
Amprius Technologies is a leading developer of pioneering silicon anode lithium-ion batteries for drones and robotics.
Our products provide the highest known energy density of any commercially available lithium-ion batteries in the world, offering a drop-in replacement for conventional solutions while delivering up to 200% greater run time.
Our commercially available SiMaxx™ batteries deliver up to 450 Wh/kg and 1,150 Wh/L, with third-party validation of 500Wh/kg and 1,300 Wh/L. To address growing customer demand, we expanded our product portfolio to include the SiCore™ platform in 2024, significantly enhancing our ability to serve additional applications.
Our advanced silicon anode, lithium-ion batteries are designed in the U.S., and have been selected by the U.S. Department of Defense as well as industry leaders such as AALTO Airbus, BAE Systems, AeroVironment and Teledyne FLIR.
Image credit: AeroVironment, Inc.
Image credit: AALTO HAPS, an Airbus subsidiary
SiMaxx Leading Batteries
Our SiMaxx batteries are based on a patented silicon anode nanowire structure delivering high-energy-density silicon anode batteries that surpass state-of-the-art graphite cell performance today. SiMaxx batteries can deliver up to 450 Wh/kg gravimetric energy density and 1,150 Wh/L volumetric energy density, with third-party validation of 500 Wh/kg and 1,300 Wh/L, and reach 80% charge in as little as six minutes. They also operate reliably across a wide temperature range – minus 30 degrees C to 55 degrees C.
SiCore Leading Batteries
The new SiCore batteries are based on an innovative, proprietary silicon anode material system capable of delivering extremely high power-to-energy ratios that significantly surpass state-of-the-art graphite cell performance today. The new silicon anode cell chemistry is designed to offer high energy density, up to 400 Wh/kg, is capable of 10C charge/discharge, and long cycle life, demonstrating as many as 1,200 cycles at full depth of discharge.
Manufacturing Strategy
Through our state-of-the-art pilot line, global contract manufacturing partnerships, and future GWh-scale production site, we are positioned to deliver our customers high-performance silicon anode batteries at scale.
Our corporate headquarters is in Fremont, California, where we maintain an R&D lab and a MWh scale manufacturing facility for the fabrication of silicon anodes and cells. To better serve growing customer demand, we’ve secured up to 800 MWh of pouch cell capacity and over 1 GWh of cylindrical cell capacity annually through strategic contract manufacturing partnerships. Collaborating with multiple partners enables us to rapidly scale production while mitigating risks such as delays, equipment failures, and supply chain disruptions.
The company has also entered into a lease agreement for a GWh-scale manufacturing facility in Brighton, Colorado. The production site is designed with flexibility in mind. With most of the design completed, the site benefits from strategic access to transportation networks, a highly skilled workforce, ample room for future expansion, and proximity to key markets.
Amprius has received numerous awards for our state-of-the-art battery technology, including:
Fast Company’s World’s Most Innovative Companies of 2024
2024 CleanTech Breakthrough Battery Technology Company of the Year Award
2024 International Battery Seminar – Best of Show New Product Award
Fast Company 2023 Innovation by Design Award Finalist
2023 International Battery Seminar – Best of Show New Product Award
Fast Company World Changing Ideas 2022 Finalist
Airbus Defence and Space 2021 Innovative Supplier of the Year Award
Energy dense battery technology for UAVs and unmanned systems
Our patented silicon anode technology features a unique manufacturing process that results in ultra-high energy density batteries. Thanks to our innovative silicon structures, we have addressed the issue of swelling, which has historically hindered the adoption of silicon. Offering the world’s only commercially available 100% silicon anode, our cell is capable of storing up to ten times more lithium than conventional graphite cells.
Our advanced silicon anode batteries also demonstrate good cycle life and fast charging times. We have repeatedly demonstrated 80% charging in under six minutes, performance that has been validated by independent third-party labs as well as multiple major aerospace companies.
Our advanced battery design enhances the capabilities and effectiveness of UAV, HAPS, LEV, EV, eVTOL, and unmanned ground vehicles. The unmatched cell performance paves the way for the evolution of electric mobility, driving manned and unmanned applications in aviation, aerospace, defence, and robotics to the next level.
Amprius Extreme Fast-Charge Demonstration
Extreme fast charge rate of 0-80% state of charge in less than six minutes demonstrated with Amprius’ 370 Wh/kg silicon anode battery:
Advanced silicon anode batteries for drones and robotics
Our high-performance lithium-ion batteries are ideal for a wide range of mission-critical and commercial applications. In addition to increasing flight time and vehicle range, the rapid charging ability provides faster turnaround for applications such as drone delivery, agricultural drones, surveying drones, long endurance drones, and heavy lift drones.
Amprius Technologies’ silicon lithium-ion batteries have the highest energy density in the industry
(1) Other than cycle life, based on survey of 18650 technical datasheets (ex. Panasonic NCR18650G), Sony VTC6 technical datasheet, iFixit reports on iPhone and Samsung batteries and Y. Sun et al.: Li-ion Battery Reliability – A Case Study of the Apple iPhone. For cycle life, based on Shmuel De-Leon: Li-Ion NCA/NMC Cylindrical Hard Case Cells Market 2021. (2) Includes both released and unreleased products with energy and power cell designs. (3) Based on Amprius’ SiMaxxTM High Power cells.
“Nobody Has Anything Like This” – Amprius Factory Tour
A tour of the Amprius facility in Fremont, CA to learn about their manufacturing process, battery testing, and future plans:
Silicon Valley battery innovator Amprius Technologies is leveraging high-performance silicon anode cells to meet rising demand in Korea’s expanding defense and commercial UAV sectors
Amprius has partnered with Nanotech Energy to secure U.S.-based production of its silicon-anode lithium-ion cells, supporting NDAA-compliant supply for defense and aerospace applications
Adoption of Amprius silicon anode technology aims to extend flight times and support heavier sensor payloads for mission-critical industrial operations
Amprius Technologies has launched the Amprius Korea Battery Alliance to strengthen its supply chain, collaborate with key partners, and expand global production of its high-performance silicon anode batteries
Amprius Technologies’ SiCore® SA08 battery cell has been selected by ESAero to enhance UAV performance, extending flight endurance and payload capacity across critical applications
Amprius Technologies has appointed Ricardo C. Rodriguez as CFO bringing extensive electrification and strategic finance expertise to support the company’s global manufacturing expansion and leadership in advanced battery technology
Amprius Technologies has secured a $35 million purchase order for its SiCore® silicon anode lithium-ion batteries from a leading UAS manufacturer, following a previous $15 million order in earlier 2025
Nordic Wing has selected Amprius' SiCore® cells for its ASTERO ISR UAV after achieving 90% greater endurance, extending missions up to four hours, and enhancing defense surveillance capabilities
Amprius has been selected for the 2025 Amazon Devices Climate Tech Accelerator to explore SiCore® battery solutions for reducing carbon impact in Amazon’s operations
AALTO Zephyr’s recent record-breaking 67-day stratospheric flight was powered by Amprius’ ultra-high-energy silicon anode batteries, advancing long-endurance UAV capabilities for defense and commercial use
Amprius Technologies has unveiled its 450 Wh/kg SiCore™ lithium-ion battery, designed for high-performance aviation and defense applications with near-term mass production
Amprius Technologies has secured a major purchase order for its SiCore™ battery cells following successful trials, highlighting its growing role in the expanding UAS market
Amprius Technologies’ new SiCore™ cell chemistry is part of its growing SiCore product platform designed to boost battery performance for electric mobility applications
New silicon anode cell with reduction of weight and size by 50% in development, after agreement was signed between Amprius Technologies and Fortune 500 company
Amprius Technologies and a Fortune Global 500 company have signed a LOI to develop a high energy SiCore cylindrical cell for Light Electric Vehicle (LEV) applications
Amprius Technologies is set to develop a 500 Wh/kg high-energy cell for the U.S. Army, utilizing the xTechPrime award to advance electric mobility applications for defense
Through new manufacturing partnerships, Amprius Technologies is increasing the production capacity of its next-generation Silicon Anode Platform, SiCore, to more than 500MWh
Amprius Technologies will supply its SiMaxx™ safe cells to the U.S. Army’s next-generation Wearable Battery pack, making a powerful, relatively lightweight, and compact solution
Amprius Technologies and Stafl Systems have made a strategic partnership to offer high-performance battery solutions, with Amprius serving as Stafl’s preferred battery cell supplier
AALTO HAPS has ordered Amprius’ 450 Wh/kg ultra-high-energy density SiMaxxTM cells, designed to operate in the most extreme flight conditions while maximizing flight range
The Best of Show New Product award for the SiMaxx 400 Wh/kg high-power cell represents a second consecutive International Battery Seminar award for Amprius, voted on by energy industry professionals
Amprius Technologies is a leading developer of pioneering silicon anode lithium-ion batteries for drones and robotics. Our products provide the highest known energy density of any commercially available lithium-ion batteries in the world, offering a drop-in replacement for conventional solutions while delivering up to 200% greater run time. Our commercially available SiMaxx™ batteries deliver up to 450 Wh/kg and 1,150 Wh/L, with third-party validation of 500Wh/kg and 1,300 Wh/L. To
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