We have been so focused on chemical storage systems lately, that some us forget other old, seemingly more efficient, mechanical batteries.

我们一直在等化学品储存系统为重点最近，我们忘记其他一些老的，似乎更有效率，机械电池。

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But it remains hard to shrink engines, batteries, mechanical actuators and control electronics to the point where they are small and light enough to fly without impairing their performance.

不过，要缩小这些飞行引擎、电池、机械促动器、中控电子装置，以使这些飞行器够轻够小地完美飞行，还是相当困难。

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These involve changes to the lithium chemistry of batteries, their mechanical properties and the electronics that control them.

这将改变电池的化学成分、机械特性以及控制电路。

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These involve changes to the lithium chemistry of batteries, their mechanical properties and the electronics that control them.

ECONOMIST: The electrification of motoring

The question is when storing of electricity in batteries or a fuel cell feedstock will become more eonomicial than burning a form of chemical energy to gain mechanical power.

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