load balancing in supercaps
For discharge you only need to prevent under voltage which means reverse polarity on caps.

For charge obviously overcharge must be prevented.

-The very best tolerances you can buy from D-K is +/-30% while typical is -20% +80%  and worst is -0/+100%.


The  mismatched rise in voltage depends on C


dV=dt*Ic/C



It is well known that balancing extends the life of rechargeables because the weakest cell degrades faster. Although the weakest capacitance discharges fastest, that does not necessary mean it ages fastest.

Balancers are essential due to unbalanced capacitance, the same as Lithium batteries.

How you balance depends on power dissipation and speed or time dt.