When the key is positioned where it can not be removed the battery bank is connected to provide 12 volt power to the rig. When the key is turned and can be removed many of the 12 volt systems but not all are disconnected. Because everything is not disconnected the batteries will discharge in storage with the key in this position.
I personally always keep the switch turned where the key can not be removed all the time and installed a full battery disconnect in the front compartment.
Zack and Donna plus Millie and Ranger
"Life is too short to stay indoors, enjoy the ride!"