Battery power? 9v gonna cut it?

Any ideas how long a 9v battery would power The pro?

Does anyone else have any solutions. Ideally that also allow me to fit a widi jack

A 9v battery is about 1200maH, and the MC6 Pro requires about 200-350mA (depending if you are using the relay ports and the brightness of the LCD). Assuming 250mA, that will only give you about 4.8hours of use.

You can consider using a larger capacity USB battery charger and connect it to the USB device port?