It looks like Sony’s has limited the use of third party batteries in their new PMW-300 camera.  The DC input has been limited to 12v which means if you are trying to power the camera using the switronics series 7 or the ikan’sIBS-U65, you will get a high voltage error in the camera.

Hope fully Sony comes out with a firmware upgrade to address this issue. The camera can handle 11-17vso there is no reason the DC input is limited to 12v.