Any well-made capacitor, if kept within voltage tolerances, has in theory an unlimited lifespan of charge/discharge cycles... This is because where the charge

Any well-made capacitor, if kept within voltage tolerances, has in theory an unlimited lifespan of charge/discharge cycles... This is because where the charge is stored -- there are no chemical reactions, no charge chemical reaction and no discharge (reverse) chemical reaction... Batteries based on chemical reactions -- typically have a limited lifespan because the charge/discharge chemical reactions -- fail for various reasons after certain amounts of cycles, because the chemical reactions fail... So it makes sense -- to try to make batteries where chemical reactions are either not present (i.e., truly capacitative), or severely limited -- in an attempt to prevent the chemical breakdown which characterizes battery failure... Related: lasersaber - "How to Build Crystal Power Cells - Long Duration Power" https://www.youtube.com/watch?v=Mzq_qWIhamQ https://www.youtube.com/watch?v=Mzq_qWIhamQ