Thanks, the point is, as you know, that capacitors that are (nominal -20%) Farads are in danger of overvoltaging if the two-stack is charged to (nomial x 2) volts.
The great advantage of supercapacitors in series stacks, that is never mentioned anywhere, is that if series stacked supercapacitors are discharged, then even if they have massively different capacitance values, no single capacitor gets a damaging reverse bias whilst the others have a positive voltage......this makes supercapacitors better than batteries...because a series stack of cells can see one cell go negative whilst the others are positive...destroying that cell.
Why is this great superb advantage of supercapacitors never mentioned..anywhere?