I do understand and I do need to provide a separate charging path (OBC mod DC/CCS). My mobile battery has separate BMS and can be charged from AC 110V/220V, DC 400V or 12V (from emergency vehicle). Mobile battery is like a luggage. It can be any size or shape. but a standard interface cord. I have several different form factors. One 10kwh is 28"x24"x16" in 150 pounds, just siting in the back seat area.