For those who have the device - on my hero 2 I was able to charge both camera and bacpac via connection on the bac pac. Is this no longer the case with the hero 3 black and v2 bacpac? I read that you can, but it didnt specify how to set it up. The manual states it supports pass through charging, first itll charge the camera, then the bacpac. It just doesnt state, do you hook up to camera first, or charge through the bacpac?