Since this miserable thread won't be left alone to die, I'll add this even though it's apparent that many aren't reading the posts before they comment...
Quote:
Originally Posted by oldtamiyaphile
Self discharge appears to be a myth.
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Depends on how you look at it. Self discharge is fairly high near the upper limits of rated voltage for a capacitor, but rapidly diminishes as voltage slightly drops.
The real problem with caps as a battery replacement is the constant parasitic draw of the vehicle. Since caps have such low energy storage to begin with, it doesn't take much time for a 25 mA parasitic drain to pull the voltage below a useful level.