Shame we can't use Nickel Iron (NiFe) batteries developed by Thomas Edison 120 years ago
They are used a lot in the rail industry for backup if the power fails. Mostly level crossings.
Makes sense given their longevity. I understand they were used extensively on the railways until the 1940's when lead/acid took over. Apparently they are making a come back as off grid green power storage. Their use gets better and better though. They give off hydrogen when being charged and thoughts are they could be redesigned as a dedicated hydrogen generator. As mentioned they are environmentally friendly, even the Potassium Hydroxide electrolyte, which ideally needs renewing every 5 to 10 years can be diluted down and used on farms to neutralise acidic soils.
