进而，完全耗尽电量的电池便永远失效，并且不能继续为电瓶总输出做贡献。

The drained cell then becomes permanently crippled and unable to contribute to the battery's overall output.

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与此同时，生产电瓶车车用蓄电池所使用的锂和钴等材料又大多从美国境外采购。

Meanwhile, materials such as lithium (PDF) and cobalt used in the manufacture of batteries for rechargeable vehicles are largely sourced outside the United States.

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虽然波音公司去年进行了燃料电池动力机的试行，但飞机是在电瓶驱动的电动机的帮助下升空的。

Although Boeing made fuel cell flight trials last year, the aircraft took to the air with help from a battery-electric motor.

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