Amprius has solved its real bottleneck, scale manufacturing: its new 500 Wh/kg SiCore cell for long-endurance aviation can be made on conventional lithium-ion equipment. Earlier 500 Wh/kg cells needed special processes and never reached volume, and Wall Street doubted execution, not technology or demand. Now its asset-light contract manufacturers can make it. Airbus subsidiary AALTO has used Amprius cells since 2018 in the Zephyr, which set a 67-day stratospheric flight record in 2025. x.com