RTX advances hybrid-electric flight with H55’s innovative battery technology.

H55 has achieved a key milestone in developing its 200 kWh Energy Storage System (ESS) for the RTX Hybrid-Electric Flight Demonstrator, following a full-power system test in June 2025. The RTX-led program, featuring Pratt & Whitney Canada and Collins Aerospace, targets a 30% fuel efficiency improvement for regional aircraft using a hybrid-electric system that integrates H55’s batteries. According to CEO Rob Solomon, Pratt & Whitney Canada utilized H55’s battery architecture as a certifiable foundation, leveraging over 2,000 hours of incident-free flight and EASA validation rather than treating H55 as a simple supplier. The ESS is engineered for aviation certification, featuring a lightweight, modular design. CTO Sébastien Demont highlighted that the demonstrator validates how H55’s certifiable battery philosophy scales from CS23 aircraft to the CS25 regional category. As the program moves toward flight testing on a Dash 8-100, H55 is extending its reach into the Part-25 market. With hybrid-electric propulsion gaining momentum, H55’s scalable, certified battery systems are positioned to play a central role in next-generation regional aircraft and long-term lifecycle operations.