Although e-bikes first appeared in the 90s, cheaper options and longer-lasting batteries are breathing new life into the concept.

虽然电动自行车最早出现在上世纪90年代，但更便宜的选择和更持久的电池正在给这一概念注入新的活力。

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The batteries had a life span of six hours.

电池的使用寿命是6小时。

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And compared with most rechargeable batteries, supercapacitors tend to have a longer working life.

和最耐反复充电的电池相比，超级电容器仍容易工作寿命更加长久。

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RPSs are ultra-long life batteries for use in the Esa's deep space programme.

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But some engineers say this can hurt the life of the batteries.

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Seamless metal containers still have myriad uses in the high-tech age: they make particularly good casings for long-life lithium ion batteries, used in mobile phones and notebook computers, since they don't corrode as welded casings do.

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