如今，燃料电池普及的最大障碍在于它的成本。

The biggest hurdle for fuel cells today is cost.

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最大的问题在于电池。

The biggest question has to do with batteries.

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现在，锂离子电池面临着最大挑战。

Now they face their biggest challenge.

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十分省电，可以最大限度地延长电池寿命。

Miserly enough to conserve battery life to a maximum degree.

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大家可以看到最大的零件是电池。

You can see the biggest component is the battery.

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大家可以看到最大的零件是电池。

You can see the biggest component is the battery.

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