Batteries add weight, and they need recharging.

电池会增加重量，而且需要充电。

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But even with advances in power systems and improved lithium-ion batteries, their range on a single charge is limited-and recharging can take hours.

但是即使是先进的动力系统和改善的锂离子电池，还是受到一次性充电电池的限制-他们再充电的时候需要耗费数小时。

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Be sure to reserve time for fun, relaxation and "recharging the batteries" so to speak.

确保为他留下一些娱乐、休息或者是所谓的充电时间。

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Electronic paper could make these even lighter and changing or recharging batteries could become a thing of the past.

ECONOMIST: Showing off

Scientists have been figuring out how to develop eco-friendly ways of recharging batteries for years, from harvesting temperature fluctuations to harnessing your fidgets.

ENGADGET: Scientists develop eco battery powered by root-extracted dye

Some of the features of the LEAF, like the settings for recharging its batteries, will be operable remotely by phone.

ECONOMIST: Vehicle telemetry