Has anyone out there figured out a way to run the camera off a 12v large battery. I have the V plate from Zacuto which holds the battery and powers the Marshall monitor. It would be really good to be able to power the camera from the same source. It would just need reducing from 12v to 7V. Does anyone make a device that does that, and connects to the camera like the A/C power connector and has a D Connector on the other end.