No, you need to check which battery model your camera is compatible with. 

Yes, the small built-in battery is used to save setting and time, and parking monitor. It won't last too long, so when the car camera is recording it needs to be continuously connected to the power supply. 

The dual dash cam can record video with the screen turned off while you use the screensaver feature, it won't distract the driver and protect privacy. If you want the dash cam records video with screen turn on, just turn off the screensaver feature. 

Yes, it comes with a mount which is a plastic pipe with a pivot at the base. I'm sure you could mount the station itself on the same size pipe. The hardest thing would be getting it level. I'm not sure what diameter the pipe is but I would guess the outside diameter is around 1 in. The pipe in the picture is part of the base, and the unit sits over the end of the pipe. Hope this answers your question. 

Has a 1/4 threaded connection for use with a tripod