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Time for a sanity check...So you could build a 16.2 V, 500F capacitor bank with about 2000 Coulombs, equals 2000 A-seconds, or 0.58 A-hr. With a 0.041 A drain load it would hold up for about 14 hours. Also how much current does the starter motor pull when cranking? The 2000 Coulombs could get used up fairly quickly in cold cranking, e.g. 200 Amps for 10 seconds. Little motorsickle/ATV batteries are rated 12V, 10 A-hr. Is 0.58 A-hr even worth the effort?
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