The nickel–iron battery (NiFe battery) is a rechargeable 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. It is a very robust battery which is tolerant of abuse, (overcharge, overdischarge, and short-circuiting) and can have very long life even if so treated. It is often used in backup situations where it can be continuously charged and can last for more than 20 years. Due to its low specific energy, poor charge retention, and high cost of manufacture, other types of rechargeable batteries have displaced the nickel–iron battery in most applications.
It has regained popularity for off-the-grid applications where daily charging makes it an appropriate technology.
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... Nickel–iron batteries do not have the lead or cadmium of the lead–acid and nickel–cadmium batteries, which makes them a lesser burden on human ...