This occurs in my 2014 Chevy Spark
I to have to disconnect the battery & reconnect it when I get to campground.
When you switch your key to accessory juice is being used by on star plus many other vampire electrical things.
This is normal in modern vehicles today.
I was told you could just put the key into the ignition & not turn it to Accessory & no ill effect would occur. I haven't tryed this & would do more research before you do this.
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