Smartflyer, the Switzerland-based developer of the hybrid-electric SFX1 aircraft, took delivery of its first batch of Adagio battery units from power systems supplier H55.
The batteries’ arrival marks a milestone in the SFX1 program’s progress toward entering service as well as the advancement of H55’s core business of supplying certifiable propulsion systems for the growing fleet of aircraft. The SFX1 is designed to provide more sustainable flight training operations at a lower cost.
For Smartflyer, receiving the batteries moves the company ahead in its proof-of-concept demonstrator program for the SFX1. The program is now moving beyond validating single components and making the transition to integrating and testing full systems.
The Smartflyer program also reinforces H55’s status as a key supplier of power systems that can be produced in scale and used commercially.
Heading for First Flight
Smartflyer plans to integrate the Adagio battery modules into the SFX1 as part of its next steps in development. This critical coming phase focuses on the validation of systems including architecture, energy management, and more in preparation for ground testing, which is planned for this summer.
The company said testing is proceeding on schedule, with fall 2026 targeted for the SFX1’s first flight.
“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 program,” said Smartflyer CEO Rolf Stuber in a news release. “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.”
Well-Developed Batteries
The occasion also serves as an indicator of readiness for H55’s products. The Adagio battery system has successfully completed all certification tests that regulators require, demonstrating safety, reliability, and suitability for use in the growing range of electric and hybrid-electric aircraft.
The company recently delivered batteries for use in the BRM Aero Bristell B23 Energic.
“This delivery marks an important step in bringing H55’s certified battery and propulsion solutions into operational aircraft programs,” said Rob Solomon, CEO of H55. “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 program and contribute to the broader adoption of electric and hybrid-electric aviation.”