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.
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:
Learn more: High Energy Density Drone Batteries
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 silicon anode lithium-ion batteries outperform traditional graphite anode batteries in a variety of key metrics:
(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:
