The Cassio 1 test-bed with VoltAero’s electric-parallel hybrid propulsion will reach a total distance flown of 10,000 km - Aviacionline.com

https://www.aviacionline.com/2022/04/the-cassio-1-test-bed-with-voltaeros-electric-parallel-hybrid-propulsion-will-reach-a-total-distance-flown-of-10000-km/