By the 1990s, energy-dense nickel-metal hydride batteries were on the market, soon followed by lithium-ion batteries.

到了 20 世纪 90 年代，市场上出现了高能量密度池，很快，锂离子池也问世了。

Lithium ion batteries are much smarter than older nickel cadmium or nickel metal hydride rechargeable batteries.

锂离子池比旧镉金属化物可充池智能得多。

A lot of those battery life myths you might hear apply to nickel-cadmium and nickel-metal hydride batteries.

你听到很多关于池寿命小窍门，仅适用于镉和池。

Hybrids aren't true electric vehicles; their nickel-metal hydride batteries are only used to optimize the efficiency of gas-burning engines.

混合动力车并不是真正动汽车；他们池仅用于优化燃汽油发动机效率。

Take sodium hydride, for example — a superbase that’s just sodium bonded to a hydrogen.

以化钠为例——这是一种超强碱，由钠与结合而成。

Then there are nickel cadmium and nickel metal hydride batteries.

然后还有镉池和池。