Any small drain will deplete the battery fairly quickly. That said no drain and batteries deplete at about 3% per month. A trickle charger, or small solar, if you have sunlight is not a bad choice for even short spells. Sometimes, those short spells get longer than we thought and at least you know you won't come back to a dead battery, but I have to ask, if the battery is disconnected, how is this possible? What is powering them?
"the JAYCOMMAND/TravelLINK screen, CO2 detector, radio, etc. all remain powered once the trailer is disconnected from the tow vehicle AND the physical battery disconnect (located in the front storage area) is disconnected."
2018 Jayco Greyhawk 29MVP
2019 Jeep Sahara Unlimited
2011 Cyclone 3010 Toy Hauler- Sold
2014 Chevy Silverado Duramax LML -Sold