But there is still no lithium battery light enough to power a small electric car over a reasonable distance on a single charge.
但是仍没有轻易做到一次充电能为一辆小型电动车通过一段合理的道路提供电力的锂电池。
They are one of the most popular types of battery for portable electronics, with one of the best energy-to-weight ratios, no memory effect, and a slow loss of charge when not in use.
他们是在便携电子产品领域中最流行的一种电池类型，具有最好的能重比，没有记忆效应，并且在不使用的情况下，充电损失比较慢。
The idea? Charge the battery of an electronic device from across the room—no wires necessary.
这个创意是，跨越房间给电子设备的电池充电，是的，不需要电线。
The laptop called the XO does not use very much power, and if no electricity is available, users can charge the battery by hand by turning cranker (a crank).
这些取名为XO的笔记本电脑省电，一旦电耗完，就可手摇曲柄为电池充电。
It then USES that power to charge a battery. An hour of walking is enough to tighten the LACES once, and it requires no energy to undo the shoes because that relies on the spring alone.
然后将这些能量给电池充电，走一个小时的路，产生的电量足以系紧一次鞋带，而解鞋带时只需依靠弹簧，因此无需能量。
It will lose the portable function if the charge circuit is wrong and the storage battery has no enough energy.
如果电源、充电电路出现故障，蓄电池能量不足，就失去便携功能。
Considering the option, having to charge the battery once or twice a day is no huge trauma.
考虑到他们别无选择，每天充一两次电并无大的损伤。
Considering the option, having to charge the battery once or twice a day is no huge trauma.
考虑到他们别无选择，每天充一两次电并无大的损伤。
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