Nickel-Iron batteries are making a comeback in the renewable-energy industry. My personal interest happens to be for wind generator/solar power energy storage and also for a pendulum gear-driven clock design that I am working on where I need a minute amount of stored power to operate a small circuit board that will keep this mechanical clock in sync with an atomic clock. Does anyone have knowledge how to extend the life of a Nickel-Iron battery? Can I just increase the thickness of the plates in a standard battery design? Also, for my mechanical clock needs, is there a way in which I can change the design to be more of a large dry-cell or gell-cell design? My clock needs are at the level of a small AAA battery yet I want the clock to last more than a century if possible, and so I am seeking an unusual way to build some large plates that will last a long time. Perhaps by using some form of potassium hydroxide paste acting as the electrolyte? Any suggestions or recommended reading is appreciated. Thanks.