SoftBank announced its proposal entitled "Research and Development on High Energy Density Battery Pack and High Power Generation Efficiency Solar cell panel for HAPS" has been adopted for a feasibility study on solar panel and storage battery technologies as part of "Research and Development on Long-Term Navigation Technology for High-Altitude Unmanned Aircrafts," in the research and development field "Development and Verification of Maritime Domain Awareness Technology Using High-Altitude Unmanned Aircraft" of Key and Advanced Technology R&D through Cross Community Collaboration Program, an open call by Japan’s national research and development agency New Energy and Industrial Technology Development Organization.

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https://www.softbank.jp/en/corp/news/press/sbkk/2024/20240925_01/