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    Some packs may consist of a combination of series and parallel connections. Laptop batteries commonly have four 3.6V Li ion cells in series to achieve a nominal voltage 14.4V and two in parallel to boost the capacity from 2 400mAh to 4 800mAh. Such a configuration is called 4s2p meaning four cells in series and two in parallel.

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    The overall efficiency can never be 100 however since extracting 100 of the flowing water s kinetic energy means the flow would have to stop. The conversion efficiency of a hydroelectric power plant depends mainly on the type of water turbine employed and can be as high as 95 for large installations.

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  • Recent progress in human body energy ..

    May 01 2021  A high energy conversion efficiency requires a large temperature difference. Since normal human body temperature is stable at 36–37 C the temperature difference that can be used for energy harvesting mostly comes from the temperature difference between the human body and the external environment.