ELECTRIC AIRCRAFT ARE all the rage, with prototypes in development in every size from delivery drones to passenger aircraft. But the technology has yet to take off, and for one reason: lack of a suitable battery.

中文翻译：

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用于电动飞机的超轻型电池

电动飞机风靡一时，从送货无人机到客机，各种尺寸的原型机都在开发中。但该技术尚未起飞，原因之一是：缺乏合适的电池。