So when sentry mode is on, the 12V cigarette lighter is always powered on, as far as I understand. I have installed a second dashcam (redundancy, better quality, etc - I want one) and am wondering, is it safe to leave it continuously powered on when sentry is on? Specifically, I am wondering if it'll have a negative impact on the battery life of the 12V. Does the cigarette lighter even get powered by the 12V battery? Or does it get powered by the main battery?