H55 has delivered its Adagio propulsion battery modules to Pratt & Whitney Canada in support of the RTX Hybrid-Electric Flight Demonstrator, marking the Swiss company’s first delivery of production-conforming systems to an active aerospace integration and flight-test program.

The modules were produced in a regulator-approved facility as production-conforming systems, not engineering prototypes, which is the threshold aerospace OEMs require before integrating supplier hardware into a certified flight program. H55 claims to be the first company to complete regulator-required propulsion battery certification testing, a milestone that preceded this delivery and forms the basis for its commercial positioning.

H55’s battery architecture was developed specifically for the certification constraints of electric and hybrid-electric propulsion—redundant safety architectures, independent cell characterization, incoming screening, and worst-case failure scenario testing aligned to regulator requirements. The company says it has accumulated more than 2,000 flight hours across multiple aircraft programs with zero battery-related incidents, a safety record it describes as a core competitive asset for OEM qualification discussions.

“H55’s ability to deliver aviation-grade battery systems within a rigorous certification and production framework plays a crucial role in demonstrating hybrid-electric technology in flight,” said Jean Thomassin, Executive Director, New Product and Service Introduction at Pratt & Whitney Canada.

Source: H55