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this post was submitted on 06 May 2023
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Technology
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The issue with batteries for air travel is more about weight. That will require different technology, eg lithium air batteries. This technology is in development but it'll be a fair few years until they get commercially manufactured.
@TWeaK, meanwhile the best alternative are airships, no problems using them with electric engines and solar panels.
I suspect temperature will also be important. Temperatures are very low in high altitude and that affects battery life.