Amprius Technologies, Inc. announced it completed a high-volume shipment of SiMaxx cells to the Korean Aerospace Research Institute ("KARI"), known as the aerospace and space agency of South Korea, further strengthening Amprius' position as the premier global battery solution for HAPS applications. In December 2023, Amprius completed a volume shipment of its 450 Wh/kg SiMaxx cells to KARI to power their solar-powered stratospheric full-scale vehicle. Amprius SiMaxx cells are designed to reduce weight and increase aircraft flight distance range significantly.

SiMaxx cells are the only known commercially available batteries that can provide enough power and endurance for HAPS overnight stratospheric flight applications and can enable higher payloads and operation in both all seasons and higher latitudes. These cells are also customizable, ensuring tasks are executed according to a company's specifications while providing greater flexibility to meet specific energy and power needs, ultimately enhancing performance effectiveness and efficiency. Amprius' 450 Wh/kg custom cell form factors are positioned to improve performance across several applications, including electric aviation (high-energy drones such as HAPS) as well as high-energy storage applications for the military.

These 450 Wh/kg cells are expected to be manufactured in large-scale production at Amprius' facility in Colorado, targeted to be operational in 2025.