However, recharging NiCad batteries is a black art.
2
镍镉是一种，可充电电池。
Nickel-cadmium is a battery that can be charged.
3
镍镉电池适合中小型的机器人，跟镍氢电池相比能输出更大的电流，而且在一两小时内即可完成充电。
NiCad (Nickel Cadmium) batteries are good for small to medium size range robots. They have the highest current output, are more affordable than NiMH's, and can be recharged within one or two hours.
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