The voltage of a single battery is 1.1 or 1.2V. The Nickel–cadmium battery marked with NICKEL-CADMlIUM on the battery and the Nickel–metal hydride battery marked with NICKEL METAL HYDRADE (or NI-MH). The charging and discharging cycle of the rechargeable battery can reach 500-1500 times, and it can discharge with high current. The internal resistance changes little at the moment of discharge, and only increases sharply at the end of discharge.

　　Among them, Nickel–metal hydride battery has no memory and the maximum capacity can reach 2700mAh, so it is better than Nickel–cadmium battery. Its economy and excellent environmental performance will gradually replace Alkaline battery and Nickel–cadmium battery.

　　Fuel cell (fc) is a device that uses fuel (such as hydrogen or containing fuel) and oxidant (such as pure oxygen or oxygen in the air) to generate electricity directly and continuously. Since it avoids the limitation of Carnot cycle, this kind of power generation device is not only efficient (the conversion efficiency of electrochemical reaction can be as high as 40% or more), but also free of pollutant gas emission, so it is a future efficient and clean power generation mode. Many companies both domestically and internationally are committed to developing suitabl

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