Each battery is covered by multiple cozies, each layer insulating the energy source and constructing a contained environment.  The natural is lighter, softer and more efficient, but is more difficult to create. The unnatural seems more efficient as each stitch is faster and easier to implement.  However, the unnatural requires more layers to be equal with the natural, inevitably consuming more materials, time, and effort.CraftInBinary3.html
A series of unnatural barriers surround the energy source.  Insulating the bottom uses more material than necessary to keep up the appearance that barriers are equal from all sides. The need to insulate the bottom is minimal, because depletion occurs from the upper to middle portions.CraftInBinary3.html