Capacitors and supercapacitors do not charge terribly well when connected in series. This will cause problems if one capacitor overcharges while charging, and/or if it is polarized, reverse charges while discharging due to the other capacitor feeding it current.
Diagram used in video can be seen at https://www.patreon.com/posts/29969953
I show some of the basic techniques used to help keep series capacitor voltage even and to use a semiconductor (LED in this case) to limit a maximum voltage.
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