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Hmm.... What if you set ultracap to have a voltage of 13.7V (lower than the normal rest voltage of the battery)? Could you use the battery's internal resistance to regulate amperage from the ultracap (which would only discharge when the electrical system is loaded enough to cause voltage sag or when the battery is discharged that much)? Put a diode between the ultracap and the battery to ensure that current only flows to the battery, not the other way.
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