[sinbad]

I have left the hatch and sometimes doors open 2 or 3 days straight, I do not manually turned off the map, overhead, or the cargo lights. With our 21 and 22, they all go off automatically in @ 20 minutes. Never a problem discharging the tiny Prime 12 v battery. Nothing else is left on or powered up. If you are camping with your wagon, you are more likely to have lights or radio powered up, using up the battery. Each time you open a door, the 20 minutes of lights restarts. A voltmeter and jump pack would be wise to carry.