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Something like a LM555 would work very well for a 1 shot. In quiescence, it can consume as little as 3mA according to the spec sheet. That is less than one standard LED, and probably low enough of a load to be insignificant. At a 3mA discharge rate, 100AH battery would take 1,300 days to discharge, and it's self-discharge rate is going to be a lot higher than that.
I have some 555s in my parts box, I might have to build a one-shot and see how much current it consumes in quiescence.
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