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A single Li-S Energy lithium-sulfur battery pack powered the Pegasus drone for almost two hours and more than 75 km during a test flight in Queensland, the company said. The flight completed the project’s development and testing work; partners will now analyze the data and assess the aircraft’s commercial potential.
Li-S Energy says one of its lithium-sulfur battery packs powered the Pegasus drone for almost two hours and more than 75 kilometres during a test flight over Queensland. The flight met the aircraft’s expected performance, according to the Australian battery developer, and ended with battery capacity remaining.
The flight completes the development and flight-test work for a project involving Li-S Energy and two other Australian companies. V-TOL Aerospace developed the aircraft’s airframe and power systems, while Li-S Energy supplied the 382-watt-hour lithium-sulfur battery packs and battery management system. Halocell Energy made the perovskite solar array mounted along the wings.
The Pegasus is a twin-motor drone with a five-metre wingspan. Li-S Energy’s battery management system works with V-TOL’s power management system to control power to the motors and aircraft systems and to manage input from the solar array. The account of the test does not specify how much the solar array contributed to the flight’s energy.
Li-S Energy said the flight used 1.1 kilograms of lithium-sulfur cells. The company compared those cells with a Tattu 6S lithium-polymer drone battery rated at 16,000 milliamp-hours and 355 watt-hours, which it says weighs about 1.85 kilograms and provides around 192 watt-hours per kilogram. On an equal cell-weight basis, Li-S Energy says its cells delivered 80% more range and flight time. That comparison excludes pack housing and battery-management-system weight and assumes flight time rises in direct proportion to cell energy.
What Longer Drone Flights Could Enable
A successful endurance test offers a practical demonstration of how a lightweight battery system might support longer drone missions. Greater time aloft could reduce the need to land and change batteries during work such as mapping or monitoring remote infrastructure, farmland and environmental sites. The reported flight is a test result, however, not evidence that the system is already commercially available or that it will deliver the same performance in routine operations.
The partners say the Pegasus was designed to carry two Li-S Energy packs. With both installed and improved solar arrays, Li-S Energy expects the aircraft could eventually fly for five to eight hours and cover 250 kilometres. Those figures are a projection, not the result of the reported flight. Commercial usefulness will depend on further testing, the complete aircraft’s payload and operating conditions, and the cost and reliability of the system.
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How the Australian Project Fits Together
The test was conducted as part of a project supported by just over A$1.35 million in Australian government funding through the Emerging Aviation Technology Partnership program. The three industry partners matched that grant, according to the report. The flight marks the completion of the project’s planned development and flight testing.
The companies divided the work across the aircraft, battery and solar components. V-TOL was responsible for the Pegasus platform and power systems; Li-S Energy developed the battery supply and management system; and Halocell Energy fabricated the wing-mounted solar array. Li-S Energy also said it filed two patent applications during the project, covering its battery management system and battery pack design. The report does not say whether either application has been granted.
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What the Flight Data Must Establish
The published account does not give the test date, detailed flight conditions, payload, route profile or a breakdown of energy supplied by the battery and solar array. It also does not provide independent measurements or a full-system comparison with the lithium-polymer pack, including the weight of housings and battery-management equipment. Li-S Energy’s 80% range and flight-time comparison rests on an equal cell-weight calculation and an assumption that flight time scales linearly with cell energy.
The expected five-to-eight-hour missions and 250-kilometre range have not been demonstrated in the reported test. The partners have yet to publish their analysis of flight data or details on pricing, production plans, customer orders and a timeline for commercial sales. The available information does not establish whether the patent applications have been approved.
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Partners to Review Flight Results
The project partners say they will analyze the flight data to characterize the Pegasus’s performance and assess its commercial potential. Li-S Energy has said the aircraft is intended to carry two battery packs and that improved Halocell solar arrays could support longer missions, but no schedule for those trials is provided.
The companies are aiming for future platform sales. Further test results would be needed to establish the projected endurance under representative operating conditions and to clarify how the battery, solar array, payload and aircraft systems perform together. No sales date or confirmed customer deployment was announced in the report.
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Key Questions
How long did the Pegasus drone fly?
Li-S Energy reported a flight lasting almost two hours over Queensland and covering more than 75 kilometres. The company said the aircraft landed with battery capacity remaining.
What powered the Pegasus during the test?
A single Li-S Energy lithium-sulfur battery pack powered the test flight. The drone also carried a Halocell perovskite solar array, but the report does not state how much energy the array supplied during the flight.
Has the drone flown for five to eight hours?
No. The reported test lasted almost two hours. Li-S Energy says a configuration with two battery packs and improved solar arrays could eventually support five-to-eight-hour missions, but that remains a projection.
What happens after the test flight?
The partners plan to analyze the flight data and assess the aircraft’s commercial potential. The report does not give a timeline for further testing or sales.
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