I have a GoPro Session. Great camera! I use it on the rear of my bike.

My setup for use as a rear camera:



In that photo you can see I am using a seatpost mount similar to the K-Edge Go Big mount. I run a USB cable from the camera to the saddle bag where I have a USB battery pack. As you can see in the photo, the USB cable running from the camera to the saddle bag is almost invisible.

The Session will only get about 1 hour and 45 minutes of recording time from it's internal battery when set to 1080p and 60fps. With my battery pack I extend that to about 8 full hours of run time.