does anyone know or is there a previous discussion on what electrical componets uses the 12v battery and what uses the ima battery pack. Is there a inverter that charges the 12v bat from the battery pack. I assume that the headlights and other normal 12v accesories are on the 12v but is the electric a/c unit 12v. What tells the ICE to run to recharge batterys and does it monitor both battery systems to maintain proper voltage for each. It seems like a lot of drain would take place on the 12v system at night with lights,a/c,blower,and other acc. and its such a small battery.With these requirements its seems a deep cycle battery would be more appropriate.Hope somebody can explain this to me. thanks