I just got the Runcam 6 for my 6" diameter X-15 and have used it twice. (Note: This is my first time with onboard recording.)
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On the first flight and recording, I used the wifi function to start recording with my phone just before leaving the pad and I closed my phone thinking it would continue recording. It didn't - which was ok since I had a major motor Cato.
The second time was at LDRS for my L3 attempt on the same X-15 flying off an M1350 and this time I manually started recording and left it running on the pads. Due to issues getting my altimeter armed (long story), it sat on the pads for quite a while before it was launched.
I just checked the camera and great news is that it recorded the flight (and subsequent continuous dragging through fields of onions) before the battery died. I'll post the video here once I figure out the best way to get the footage downloaded and trimmed.