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That doesn't solve the problem of losing memory presets, which is among the reasons to have a battery. If you don't care about that, then you could just use a detachable battery or supercap. Heck, if the parasitic drain is extremely low, you could probably just leave the supercap in and it would hold enough charge to start the car even after sitting a couple weeks.
My truck is down to about 5 mA parasitic drain (radio), so it could theoretically run off supercaps alone.
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