Question: Why do our gel cells have such long shelf life? Answer: a. Our exclusive, patented calcium/copper lead alloy is very pure. Also, the premium separators that we use are very pure and our demineralized gel is ultra-pure. Impurities in the lead alloy, separators and electrolyte cause tiny currents inside a cell which eventually discharge the battery and shorten its shelf life. The purer the components, the longer the shelf life. No one can match Dynacell's "purity" of components! b. Our exclusive "weld seal gasket" blocks the minute cell-to-cell currents that cause self discharge. The better the weld seal, the longer the shelf life. Weld seals are exclusive to Dynacell gel cell batteries.