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I tested a small DC voltage buck converter to find that it draws 15 to 18 mA on both the output side with no input connected and vice versa. So that unit in a '12V' twin pack would continuously dissipate about 400 mW (assuming it draws on both ends).
On higher currents it was up to 95% effective though.
A capacitor bank/small battery split by a DC-DC converter is possible and clever but the converter is yet another parasitic load.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
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