Re: Lithium 9v = Super AAAA\'s?
Some 9V alkaline batteries are made with 6 cells that are roughly AAAA sized, arranged in a bundle. Others use rectangular cells that are stacked. Since the nominal voltage of an alkaline cell is 1.5V, the 6 in series give the 9V for the battery.
Most lithium cells have a nominal voltage of 3 to 3.6V (depending upon the precise chemistry), and I would expect lithium 9V batteries to be made of _three_ of these cells. So I wouldn't expect any of these sort of lithium batteries to be made with AAAA cells; 3 of them aren't the right size.
There are 1.5V AA lithium cells (they use a different chemistry), so in theory there could be AAAA 1.5V lithium cells. If this is the case, then it is possible that someone is building 9V batteries from these cells. IMHO unlikely, but possible.
-Jon