Does anyone know can this car sit when i am overseas for a few months? if not can a person charge the big volt battery and how? The 12volt battery can be keep up with a battery tender (float) charger but what about the killer battery?? If not why didn't they put a trickle charger and a cord on it??

TCH-43mpg
VW TDI--48
08 LS 600 HL-20
08 LX 470-16