Hypogeal Battery Using Sandy Al-Ion Rechargeable Cells

A method and apparatus for storing electrical energy using ensemble electrochemical cells each comprising a cylindrical exterior container, a coiled anodic aluminum wire, carbon graphite cathode, a sandy electrolyte medium, and an ionic electrolyte based on a compound mixture of urea, sea-salt, and water. The invention teaches the use of inexpensive materials and simple assembling of sandy rechargeable cells into a hypogeal battery.