The Edison Cell or Nickel Iron, Nife Cell whatever you call it is a battery that has an amazing history. This cell was used in the 1st electric cars. Insert Picture here (Edison electric car Jay Leno Owns an electric Baker, and it still had the original batteries in it. He has since changed them to increase the power of the car to get more performance from the vehicle for speed.
Nickel Iron has been used over the years in many heavy-duty situations.
The third line in the London underground was to charge the Nickel Iron Batteries while the trains were underground and when they would come out of the underground where there were no electric lines they would operate on the Nickel Iron Batteries until the next underground section. The batteries were never replaced they just did away with the whole trains and systems. There are still some of these locomotive's operational in the U.K for display purposes with the original NiFe cells. Nickel Iron have had an enormous increase in use in Off-Grid Stand-alone solar systems and with Hybrid battery storage situations.