H55 successfully completes all regulator required Propulsion Battery Module Certification tests for the first time in the aviation industry
Source: H55 Electric aviation has faced a single, unresolved bottleneck: proving to regulators that high-energy propulsion batteries can safely contain worst-case failures. H55 has announced that it has completed the industry's first regulator-required and authority-witnessed propulsion battery module certification test sequence — addressing a critical gating factor that has constrained the commercialisation and financing of electric aircraft programs. Completed on December 19, 2025, the EASA-supervised campaign places H55 at the forefront of efforts to establish certification-grade, aviation-safe propulsion battery systems, setting the standards against which future programs will be assessed. The campaign provides certification-level evidence that commercial lithium battery cells can be integrated into aviation propulsion battery systems capable of safely containing worst-case failure scenarios, especially fire propagation. From Validation [...]
