FocusPulling (.com), uploaded this video about getting some extra battery power for your camera. He goes through a bunch of gear that you might need and if you skip to around the 07:32 mark in the video, he goes over the specs of the CAME-TV VM02 V-Mount Plate.
The CAME-TV VM02 V-Mount Plate offers 12V, 7.2V and 5v outputs and comes with an industry standard 15mm rail mount, so that mounting it to your rig is a breeze.
Click below for more information on the CAME-TV VM02 V-Mount Plate.