Hybrids such as the Toyota Prius and Ford Escape use nickel-metal hydride batteries that are larger than lithium ion systems, the latter of which can pack more electric power into a smaller space.

象丰田普锐斯和福特翼虎这样的混合动力车使用的镍金属氢化物电池比锂离子电池系统要大，后者能把更多的电能封存在一个更小的空间内。

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A typical pack might have a stack of 96 batteries, developing a total voltage in excess of 400v for Li-ion batteries charged to 4.2v.

一个典型的电池组含有的电池可能有96个之多，就充电至4.2 V的锂离子电池而言，总共能产生超过400v的电压。

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Theyhold their charge. A lithium-ion battery pack loses only about 5 percent of itscharge per month, compared to a 20 percent loss per month for NiMH batteries.

锂离子电池能保持电量。同锂氢电池每个月损失20%的电量相比，锂离子电池组每个月仅损失5%的电量。

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Although the current batteries are "durable and reliable, " Hartline said lithium ion batteries pack more energy into a smaller space.

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But the industry is shifting to lithium ion batteries because they pack more horsepower-hours into a pound.

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Boeing convinced regulators to allow the use of lithium-ion batteries on its 787, which are lighter and pack more energy than traditional nickel-cadmium batteries, but are prone to catching on fire.

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