Multiple choice The potassium hydroxide acts as a electrolyte in a nickel-cadmium battery a nickel hydrogen battery a nickel-metal hydride cell a nickel-iron battery Reveal answer Fill a bubble to check yourself D Correct answer Explanation The nickel-iron battery (NiFe battery) is a storage battery having a nickel(III) oxide-hydroxide cathode and an iron anode, with an electrolyte of potassium hydroxide. The active materials are held in nickel-plated steel tubes or perforated pockets.