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Re:Airplanes that fly on electricity debut at Fresno’s Chand... by dredmorbius on Friday April 20, 2018 @01:56AM (#16882442)
It's actually precisely the opposit. Altitude is your battery.

When power is surplus, climb to your service ceiling. When not, descend. Utilise battery when at minimum altitude.

This was the technique used by Solar Impulse 2 on its round-the-world (though not nonstop) flight. At a cruse speed of 70 kph (43 mph).

https://en.wikipedia.org/wiki/Solar_Impulse

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