H55 Delivers Certification-Grade Propulsion Battery Modules to Pratt & Whitney Canada for Hybrid-Electric Flight Demonstrator Program

Swiss battery technology company H55 has announced the delivery of certification-grade propulsion battery modules to Pratt & Whitney Canada in support of the RTX Hybrid-Electric Flight Demonstrator program. Pratt & Whitney is a business unit of RTX.

From Technology Development to Industrial-Scale Production

This delivery represents more than a hardware integration milestone — it further validates H55's successful transition from technology development to industrial-scale execution. For H55, it marks a significant step in the commercialization of its certification-ready energy storage technology for hybrid-electric aviation applications.

The achievement goes beyond hardware integration itself. It demonstrates H55's capability to manufacture production-standard propulsion systems within a regulatory-approved framework and deploy them into real-world flight integration and flight test programs — a capability held by only a handful of companies globally.

Growing Industry Demand for Certification-Ready Systems

As electric and hybrid-electric aviation progresses from early-stage concepts toward certification and commercialization, aircraft manufacturers increasingly require more from their partners than technological innovation alone. Industrial maturity, safety architecture, and certification-ready production systems are now essential.

"What aircraft manufacturers need today is not just battery technology — they need certified safety architectures, industrialized manufacturing, operational reliability, and scalable systems integration," said Sébastien Demont, Co-founder and Chief Technology Officer of H55.

"Delivering production-standard modules to the RTX Hybrid-Electric Flight Demonstrator validates H55's ability to meet those requirements at industrial scale, and is an important step in extending our certification-grade energy storage technology to broader commercial aviation applications," he added. "This achievement lays a solid foundation for future developments in hybrid-electric aviation, defense, drones, and next-generation aviation platforms."

Zero-Incident Track Record and Industry-First Certification Testing

H55's proprietary battery architecture has been specifically designed to meet the rigorous certification and operational demands of electric and hybrid-electric propulsion systems. The company has accumulated more than 2,000 flight hours across multiple aircraft programs with zero battery-related incidents, continuously strengthening its competitive position.

H55 also became the first company in the industry to complete regulator-required propulsion battery certification testing — a milestone that now serves as a critical foundation for its entry into formal aviation program deliveries.

Pratt & Whitney Canada: Hybrid-Electric Propulsion Is a Key Path Forward

"Hybrid-electric propulsion is an important pathway to improving fuel efficiency and performance across a range of future aircraft platforms," said Jean Thomassin, Executive Director of New Products and Services Introduction at Pratt & Whitney Canada. "H55's ability to deliver aviation-grade battery systems within a rigorous certification and production framework plays a key role in validating hybrid-electric technology in flight."

Image credit: H55 Adagio battery module inside Pratt & Whitney Canada hangar ©RTX

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