I have/had a 2-channel Blackvue dashcam with a Celink Battery B connected via the 12v for parking mode. There is no easy out of the area place to put the battery (I ended up putting it behind the center console on the floor).
Anyway, once Senty Mode came around, I found that the 12V stays on (whenever Sentry is activated). So I removed the Celink Battery and still have parking mode with my Blackvue. I also get double coverage with Sentry Mode activated. It's a win-win for me.