The batteries have to store a lot of energy in a small, light package, scoring high in a quality known as energy density.

新型电池必须在轻小的电池组里储存大量电能，在能量密度上表现出高评分。

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Nowadays, the novel secondary lithium battery is widely used for it is safe and reliable, small and light, good for environment protection with high power density.

当前，安全可靠、有利于环保、高功率密度、体积小、重量轻的新型二次锂电池正被广泛应用。

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Some cars equipped with high strength discharge headlights HID, the device through its pre designed electrical system generated high voltage arc discharge generated high density light source.

有些汽车装备了高强度放电前大灯hid，该设备通过其预先设计的电子系统产生的高压电弧放电生成高密度光源。

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Heavy crudes (high wax content, high API viscosity, high density) cannot be refined efficiently by refineries geared to refine light crudes and vice versa.

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The technological advance of thin and light flexible display has encouraged the development of flexible batteries with a high power density and thermal stability.

ENGADGET: Korean scientists solve flexible battery riddle (video)