Reducing the size and weight of batteries with the necessary charge capacity has been a long-running battle for developers of electric cars.

降低电池的大小和重量的同时又能保证必需的电量一直以来都是电动汽车研发人员长期奋战的目标。

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That's shifted in recent years to lithium-ion batteries, which can be made much smaller, with a superior weight-to-energy ratio.

近几年转向了锂离子电池，可以做的小很多，有着超高的重量能量比。

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It is ergonomically designed with a weight of just 223g, including its AA batteries, which allow up to 60 hours of operation.

这是符合人体工程学设计，重量仅为二二三克，包括AA电池，使长达60个小时的作业。

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The total weight comes in at a feathery 1.6 metric tons, with the batteries accounting for 661.39lbs (300kg) of it.

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The front-wheel drive LEAF again uses a dedicated EV platform with batteries housed in the floor for optimum vehicle packaging and weight distribution.

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This means that batteries could be smaller with the resulting reduction in electric vehicle cost and weight.

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