September 30, 2026 — Queensland, Australia. Li-S Energy says the Pegasus long-endurance UAV completed a series of flight tests culminating in a flight of nearly two hours and more than 75 kilometers on a single lithium-sulfur battery pack.
What happened
The Pegasus program combines a V-TOL Aerospace airframe, a Li-S Energy battery system and a Halocell Energy perovskite solar array. Li-S Energy says the final endurance flight used a single 382 Wh lithium-sulfur pack, met expected flight performance and landed with battery capacity remaining.
The company says the battery enabled more than 75 kilometers of sustained cruise and calculates that, on an equal cell-weight basis, its lithium-sulfur cells would provide about 80% more range and flight time than a high-performance professional lithium-polymer UAV battery. That comparison is a company calculation rather than a side-by-side flight test.
Pegasus was designed for two Li-S Energy packs. With a dual-pack configuration and improved solar performance, the partners say the platform is expected eventually to reach five to eight hours of endurance and up to 250 kilometers. Those longer figures are targets, not demonstrated flight results.
Why it matters
Battery energy density remains one of the central constraints on electric UAV endurance, payload and operating economics. The Pegasus test is a useful real-aircraft data point for lithium-sulfur chemistry moving beyond laboratory specifications into an integrated unmanned platform.
What to watch
- Dual-pack and improved-solar flight tests
- Whether five-to-eight-hour endurance is demonstrated in flight
- Commercial platform sales or named OEM customers
- Pack cycle life, safety qualification and production scale
Source
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