To the O.P. - I just bought the slightly-smaller version of your trailer (2109S) and I was amazed by how fast the single battery became depleted, just sitting there doing nothing. (I didn't disconnect the battery because I was stocking the trailer and occasionally running the fantastic fan) Several days into my "nesting" - I noticed that the antenna power was turned on (green light behind the TV) so I switched that off; but there's still a parasitic draw from the LP detector, etc. For $25, I bought a "float charger" from Amazon that will hopefully prevent battery depletion.