so simple linear equations such as ohm's law do not apply.
Then, the battery on the 5V pin would backfeed power when VIN is lost
How do car manufacturers do it? ...... these continually waste power through the drop
I'm also thinking: How do car manufacturers do it? They have heaps of crap running that probably utilises 5V.. Clocks, radios, etc. - Voltage regulator to reduce to 5V - but then these continually waste power through the drop.
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