Conventional lithium-ion or nickel metal hydride rechargeable batteries contain active material that is placed into a thin film.

传统的锂离子以及金属氢化物镍蓄电池中所含有的活性物质被放置在一个薄膜中。

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While far trickier to handle, lithium-ion cells pack twice the punch of their nickel-metal hydride equivalents.

但更为棘手的是，锂电池会是同等的金属氢化镍电池组效能的2倍。

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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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To be technical they have moved from nickel cadmium (NiCad), through nickel-metal hydride (NiMH) to lithium-ion (Li-ion).

FORBES: Running in place

Lithium-ion batteries are lighter, more efficient and more powerful than nickel-metal hydride batteries used in first-generation hybrids.

ENGADGET: Ford's 2013 C-Max Energi rolls out 95 MPGe, arrives later this fall

Lithium-ion batteries are lighter, more efficient and more powerful than nickel-metal-hydride batteries used in first-generation hybrids.

ENGADGET: Ford C-Max Energi pricing: $29,995 after a federal tax credit, available this fall