If it is truly just the "parasitic drain" only that is drawing the battery down, then a decent charged battery should be able to last several weeks to a few months, not days. If you are experiencing a dead battery after 9 days, I would have it load tested to make sure you aren't dealing with a dead/dying cell.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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