RE: [CAD_CAM_EDM_DRO] 1.5 volts

Why are most cells in the 1.5 volt range?
I seem to recall that the answers are:
1) Much higher than 1.5 volts, and the cell's own EMF starts to decompose the
water and generate Hydrogen and Oxygen. For instance, a car battery (nominally 2
volts/cell) generates H2 and O2 when overcharged (and even a bit during normal
charging). Essentially, it becomes difficult to insulate the cell from itself.
2) Much lower than 1.5 volts, whats the point? The only type of cells below 1
volt that anyone even considers using are solar cells and some "standard" cells
used to produce "standard" voltages--not for supplying power.
-Kevin Martin