Australian tech firms Li-S Energy, V-TOL Aerospace, and Halocell are joining forces to develop high-altitude, long-endurance drones.

The drones, capable of flying up to 70,000 ft for several weeks, will incorporate Li-S Energy's lithium sulphur batteries, Halocell's perovskite solar cells, and V-TOL's Pegasus fixed-wing aircraft designs.

Potential applications include surveillance, environmental monitoring, digital farming, disaster response, infrastructure inspections, logistics, and research.

The project will use battery cells produced at Li-S Energy's $10m facility in Geelong.

The three-way collaboration aims to produce drones with flight times six times longer than current small-fixed-wing drone aircraft.