Nickel-hydrogen

Nickel-hydrogen (NiH2) is a type of rechargeable battery used in space and astronautical engineering applications. It is a type of electrochemical cell that uses nickel oxide hydroxide and hydrogen as electrodes. The battery has a high energy density, long cycle life, and is capable of operating in extreme temperatures and vacuum environments. Nickel-hydrogen batteries are commonly used in satellites, space probes, and the International Space Station. They are also used in electric vehicles and hybrid electric vehicles on Earth due to their high energy density and long cycle life.
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