H55 has delivered certification-grade propulsion battery modules to Pratt & Whitney Canada for the RTX Hybrid-Electric Flight Demonstrator, advancing the commercial deployment of its energy storage technology and demonstrating industrial-scale manufacturing capability.

The delivery places H55's production-conforming battery systems into an active aircraft integration and flight-test programme, highlighting the company's ability to manufacture propulsion systems within a regulator-approved production environment.

As hybrid-electric aviation progresses from development programmes toward certification and commercial service, manufacturers increasingly require suppliers capable of combining technological innovation with certified production capability and operational maturity. H55 says the programme validates its manufacturing framework, safety architecture and readiness to support future aerospace applications.

“Aircraft manufacturers today require more than battery technology,” says Sébastien Demont, co-founder and CTO of H55. “They require certification-grade safety architecture, industrialised manufacturing, operational reliability and scalable systems integration. Delivering production-conforming modules into the RTX Hybrid-Electric Flight Demonstrator validates H55's ability to meet those requirements at an industrial scale and marks an important step in bringing our certification-grade energy storage technologies to a broader range of commercial aerospace applications. This achievement provides a strong foundation for what comes next across hybrid-electric aviation, defence, UAVs and next-generation aerospace platforms.”

H55's battery architecture was developed to meet the certification and operational requirements of electric and hybrid-electric propulsion systems. The company has accumulated more than 2,000 flight hours across multiple aircraft programmes without a battery-related incident and has also completed regulator-required propulsion battery certification testing.

The programme further strengthens H55's position in certification-grade energy storage systems as hybrid-electric aviation progresses toward commercial deployment.