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All the capacitor balancing circuits I've seen just use a voltage regulator or LEDs across individual cells, that one appears to do the same. In that picture, you can see those red wires going down to the bottom, so I think there are 6 boards total.
The most ghetto thing you can do is use diodes and resistors across the terminals, but I feel like these days when you can get inductive active balance circuits for 10 dollars, you might as well do it properly.
And yea I think not pushing close to the max voltage is a good idea. 6 in series leaves some comfortable margin which should help the electrolyte last longer.
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