H55 Delivers First Certifiable Battery Modules for Smartflyer’s SFX1 Electric Aircraft

Smart­fly­er has announced the suc­cess­ful deliv­ery of the first batch of Ada­gio bat­tery mod­ules from H55, mark­ing a key mile­stone in the devel­op­ment of its Smart­fly­er SFX1 elec­tric air­craft.

The deliv­ery rep­re­sents a crit­i­cal step for­ward in the SFX1 Proof of Con­cept Demon­stra­tor pro­gram, enabling the tran­si­tion from com­po­nent-lev­el val­i­da­tion to full sys­tem inte­gra­tion and test­ing.

While for H55, it marks the con­tin­ued inte­gra­tion of its cer­ti­fi­ca­tion-ready bat­tery sys­tems into active air­craft pro­grams, rein­forc­ing its posi­tion as a provider of scal­able, com­mer­cial­ly deploy­able elec­tric propul­sion solu­tions.

Rolf Stu­ber, CEO of Smart­fly­er, said:“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.

“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.”

Smart­fly­er is a Switzer­land-based avi­a­tion com­pa­ny devel­op­ing the SFX1, an inno­v­a­tive hybrid-elec­tric air­craft designed for sus­tain­able pilot train­ing.

By com­bin­ing advanced elec­tric propul­sion with a range exten­der archi­tec­ture, Smart­fly­er aims to sig­nif­i­cant­ly reduce emis­sions and oper­at­ing costs while main­tain­ing oper­a­tional flex­i­bil­i­ty. The SFX1 pro­gram is cur­rent­ly pro­gress­ing through its Proof of Con­cept phase, with a strong focus on cer­ti­fi­ca­tion-ready tech­nolo­gies and scal­able solu­tions.

The new­ly deliv­ered Ada­gio bat­tery mod­ules will be inte­grat­ed into the SFX as part of the next phase of devel­op­ment. This includes com­pre­hen­sive sys­tem-lev­el val­i­da­tion cov­er­ing propul­sion archi­tec­ture, ener­gy man­age­ment, and oth­er crit­i­cal air­craft sys­tems, in prepa­ra­tion for the upcom­ing ground test cam­paign.

The Ada­gio bat­tery sys­tem has suc­cess­ful­ly com­plet­ed all reg­u­la­tor-required cer­ti­fi­ca­tion tests, demon­strat­ing its safe­ty, reli­a­bil­i­ty, and suit­abil­i­ty for inte­gra­tion across a grow­ing range of elec­tric and hybrid-elec­tric air­craft appli­ca­tions.

Ongo­ing efforts focus on coor­di­nat­ing instal­la­tion, cal­i­bra­tion, and test readi­ness to ensure a smooth tran­si­tion into the next mile­stones. Ground test­ing of the SFX1 is planned for this sum­mer, with the first flight tar­get­ed for autumn, keep­ing the pro­gram aligned with its devel­op­ment roadmap.

Rob Solomon, Chief Exec­u­tive Offi­cer of H55, said: “This deliv­ery marks an impor­tant step in bring­ing H55’s cer­ti­fied bat­tery and propul­sion solu­tions into oper­a­tional air­craft pro­grams.

“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.”

H55 is a Swiss-based com­pa­ny spe­cial­iz­ing in cer­ti­fied elec­tric propul­sion and cer­ti­fi­ca­tion-grade ener­gy stor­age sys­tems for avi­a­tion. The com­pa­ny enables elec­tric avi­a­tion to scale by trans­form­ing com­mer­cial lithi­um cells into avi­a­tion-safe Ener­gy Stor­age Sys­tems that reg­u­la­tors approve, insur­ers under­write, and OEMs can deploy repeat­ed­ly as a cer­ti­fied propul­sion plat­form across air­craft pro­grams.

Found­ed as the tech­no­log­i­cal lega­cy of the Solar Impulse pro­gram, H55 builds on more than two decades of hands-on elec­tric avi­a­tion expe­ri­ence. 

The com­pa­ny has designed, built, and flown mul­ti­ple elec­tric air­craft and has accu­mu­lat­ed more than 2,000 hours of ful­ly elec­tric flight with zero bat­tery-relat­ed incidents—providing the oper­a­tional depth required to exe­cute cer­ti­fi­ca­tion-grade pro­grams, not mere­ly com­ply with them.