Using a 2nd deep cycle battery for a dash cam

nunz

nunz

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I have an Optima RedTop battery (50AH, 800CCA) under the hood as a starting battery. Suppose that I install a battery isolator and an Optima YellowTop battery (55AH, 750CCA) in the trunk, then wire my dash cam (BlackVue DR770X-2CH) to the YellowTop.

QUESTION. In Park Mode, how long would I expect the dash cam to run until it depletes the YellowTop, assuming it is fully charged?

If the dash cam runs "long enough" until it depletes the YellowTop, this setup seems to avoid installing expensive park mode batteries. Any thoughts would be appreciated.
 
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