Analysis of pressure variations in a low-pressure nickel-hydrogen battery. Part 2: Cells with metal hydride storage

► Low pressure nickel-hydrogen battery for use in implantable neuroprosthetic device. ► Metal hydride/hydrogen gas used as hydrogen storage at sub-atmospheric pressures. ► Pressure variations follow desorption curve of the pressure composition isotherm. ► State of charge predicted accurately based on pressure variations in the battery. ► Lower self discharge rate of battery with metal hydride vs only H2 gas.