[mkesper]

If using supercapacitors, use some known not for leaking else you're back to square one (do a search for capacitor recap).

[duskwuff]

That issue doesn't apply to supercapacitors (nor to any capacitor manufactured in the last 15-20 years, really). It affected some aluminum electrolytic capacitors manufactured with a defective electrolyte in the early 2000s.