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Brisbane-based lithium-sulfur battery developer Li-S Energy (ASX: LIS) has secured regulatory approvals to airfreight its prototype battery cells to the US, clearing a direct supply route into the world's largest defence and drone market.
The dual approvals from Australia's Civil Aviation Safety Authority and the United States' Pipeline and Hazardous Materials Safety Administration and Federal Aviation Administration mark a significant logistics milestone for the pre-revenue company which has been developing lithium-sulfur cell technology targeting uncrewed aerial systems and other defence applications.
Li-S Energy says that as a bespoke and innovative ultra-high energy density chemistry, its lithium-sulfur cells require dangerous goods approvals that go beyond standard lithium-ion classifications while they remain in pre-production prototype form.
The news comes as Li-S Energy ramps up its manufacturing feasibility work after receiving the first $1.9 million tranche of a $7.86 million grant from the Australian Renewable Energy Agency (ARENA) in the March quarter.
The ARENA funding sits within a total project cost of $15.72 million and is backing a Phase 4 manufacturing feasibility study targeting up to 1 GWh of annual production capacity, with engineering consultancy HATCH leading a front-end loading study expected to complete in early Q3 2026.
“These approvals give Li-S Energy a working pathway to deliver cells from our Geelong production line directly to US customers, primes and government agencies evaluating next-generation drone and defence platforms," says CEO Dr Lee Finniear.
"Combined with our AUKUS membership and Paladin US representation, we now have the operational means to materially expand our US commercial pipeline.”
Li-S Energy has been positioning its lithium-sulfur chemistry as a lighter, safer alternative to conventional lithium-ion cells for drone and defence applications.
The company signed a collaboration agreement with Australian defence drone maker Praetorian Aeronautics in October last year to advance sovereign defence capabilities.
“These approvals reflect the maturity of our cell design and the controls around our innovative chemistry," says Li-S Energy's CTO Dr Steve Rowlands.
"We can now place working cells with US defence and drone integrators designing the next generation of unmanned platforms, where lithium-sulfur’s energy and weight advantages translate most directly into advanced capability.”
Li-S Energy says the US is the largest and most sophisticated defence market in the world with the global proliferation of unmanned aerial, ground and autonomous platforms driving "substantial demand for advanced batteries that perform beyond conventional lithium-ion capabilities".
"The new approvals position Li-S Energy to engage US defence prime contractors, drone manufacturers and government agencies on a timely, end-to-end basis, from cell evaluation through to pilot supply," says the company.
"The approvals complement LIS’ AUKUS membership, which enables cell exports to the US and UK without individual export permits, and the recent appointment of Paladin Defence Services as the company’s US representative.
"Together, these capabilities position Li-S Energy as a credible Australian contributor to the sovereign and allied supply chains for advanced energy storage that allied defence forces are now actively building."
Li-S Energy says it will begin dispatching prototype cells to US-based partners and customers on a project-by-project basis.
The company is also progressing UN38.3 cell certification which, once complete, will enable larger-volume shipments under standard dangerous goods classifications.
Despite the regulatory progress, Li-S Energy remains at a pre-commercial stage.
The company reported zero revenue from customers for the quarter ending 31 March 2026 and held $14.9 million in cash, with net operating cash outflows of $419,000.
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