https://www.handymath.com/cgi-bin/spcfgrvkoh.cgi?submit=Entry

https://en.wikipedia.org/wiki/Nickel%E2%80%93iron_battery

https://www.electrical4u.com/nickel-iron-batteries-or-edison-batteries/

http://spisy.upv.cz/Patents/FullDocuments/272/272401.pdf

https://www.funchem.cz/www-funchem-cz/eshop/0/0/5/8-Chemicka-niklovaci-lazen-Niklik-1000-ml