I notice that crystal cell making is not included in this forum. There has been a lot of interest in making those cells .
All is needed is a magnesium rod, a copper tube, alum, borax, epson salt, and no salt salt.
No environment damaging chemicals. Presently these cells can put out about 1.37 to 1.5 volts.
The beauty of these cells is that they RECHARGE themselves after use.
No one has yet established the life span of these cells but they may last a very long time.
Why has these cells not put in production is very simple.
You can't make money when the cell lasts almost forever.
Need a lot of folks to look into this.