Battery module deliveries from H55 have moved Smartflyer’s SFX1 programme into its next phase, shifting from component validation into full system integration and testing.

The first batch of Adagio battery modules will be integrated into the hybrid-electric four-seat SFX1 demonstrator, supporting system-level validation across propulsion architecture, energy management and wider aircraft systems ahead of ground testing.

The delivery also reflects progress on H55’s side, with its certification-ready battery systems continuing to enter active aircraft programmes as part of a broader push toward commercial deployment of electric propulsion technologies.

The Adagio system has completed all required certification testing, confirming readiness for integration across a growing range of electric and hybrid-electric aircraft applications.

Integration activity is now intensifying across the SFX1 programme, with installation, calibration and test preparation under way. Ground testing is planned for summer, with a first flight targeted for autumn as development milestones advance.

“Receiving the first Adagio battery modules from H55 is a major milestone for Smartflyer and a key enabler for the next phase of our development programme. It also highlights the strength of our collaboration with a partner whose technology is not only innovative but ready for real-world application. Together, we are taking concrete steps toward bringing efficient and sustainable aviation solutions to market,” says Rolf Stuber, CEO of Smartflyer.

“This delivery marks an important step in bringing H55's certified battery and propulsion solutions into operational aircraft programmes. Our collaboration with Smartflyer illustrates how our technology, spanning both electric and hybrid-electric configurations, is moving from development into commercial application, enabling aircraft manufacturers to accelerate their path to flight. We are proud to support the SFX1 programme and contribute to the broader adoption of electric and hybrid-electric aviation,” says Rob Solomon, chief executive officer of H55.