Aalto zephyr achieves world-record 67-day flight powered by amprius ultra-high-energy batteries

Fremont, calif.--(business wire)--amprius technologies, inc. (“amprius” or the “company”) (nyse: ampx), a leader in next-generation lithium-ion battery technology, today announced that its silicon anode batteries powered aalto's zephyr high-altitude pseudo-satellite (haps) aircraft during a world-record-setting 67-day flight in the stratosphere, which concluded on april 28, 2025. this uninterrupted flight, conducted at altitudes around 70,000 feet, surpassed zephyr's previous endurance record o.
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