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The problem is not the cranking amps, that 20Ah should have no trouble cranking most engines.
The problem is that parasitic draw while the car is sitting lowers the battery voltage, and causes increased charging current when the car is started. This is bad for the battery's life.
Ultracapacitors make the problem worse because they have leakage. I believe they are best paired with an undersized cheap lead acid since those are the batteries that tend to have trouble providing enough power to crank an engine.
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