H55 announced progress on its 200 kWh Energy Storage System (ESS) for the RTX Hybrid-Electric Flight Demonstrator, following a successful first full-power system test in June 2025. Led by Pratt & Whitney Canada and Collins Aerospace, the demonstrator aims for 30% better fuel efficiency in regional aircraft by combining a thermal engine, a 1-megawatt motor, and H55’s batteries. H55 CEO Rob Solomon emphasized that Pratt & Whitney Canada selected H55’s architecture—already proven with over 2,000 flight hours and EASA test campaigns—as the certifiable foundation, not just a component. The ESS is lightweight, modular, and built on a cell architecture already validated by the European Union Aviation Safety Agency. CTO Sébastien Demont noted that the CS25 demonstrator proves the scalability of their CS23-certifiable battery philosophy. Born from the Solar Impulse project, H55 is now advancing toward aircraft integration on a modified Dash 8-100. This milestone extends H55’s technology into the Part-25 regional transport category, unlocking significant market potential as hybrid-electric architectures gain traction. Solomon concluded that the program demonstrates how certifiable battery systems can scale from smaller aircraft to the regional aviation market, paving the way for future commercial applications.
H55 battery tech powers RTX hybrid-electric flight demonstrator’s progress.
