  This study introduces the principles of a new class of batteries,
rechargeable molten air batteries, and several battery chemistry examples are
demonstrated. The new battery class uses a molten electrolyte, are quasi
reversible, and have amongst the highest intrinsic battery electric energy
storage capacities. Three examples of the new batteries are demonstrated. These
are the iron, carbon and VB2 molten air batteries with respective intrinsic
volumetric energy capacities of 10,000, 19,000 and 27,000 Wh per liter.
