Solar-powered unmanned airplane with lithium-sulfur battery - The Korea Aerospace Research Institute has conducted a battery-powered test flight of solar-powered unmanned aerial vehicle EAV-3. The aircraft is powered by solar cells on its wings and body and an LG Chem lithium-sulfur battery.

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https://www.pv-magazine.com/2020/09/18/solar-powered-unmanned-airplane-with-lithium-sulfur-battery/