Can't speak for the earlier years but on our 2016 Cornerstone it's behind a black plastic panel in the frontmost curbside bay, right between the entry door and basement freezer. A couple of screws remove that panel. My batteries are on the driver side of the coach.
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Mark & Leann Quasius
2016 Cornerstone 45A
2020 Jeep Gladiator Rubicon
2021 Jeep Wrangler Rubicon
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