HonestReview
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Some days I won't even drive the car, so I guess power banks are my best option for running 4 cams overnight. Are those models the best for something like this?
Power Bank still relies upon you driving the car to charge the battery pack. Theoretically, if you drive enough, the battery pack is charged and you'll have 24 hours or so of "parking mode".
Hard Wired direct to fuse box requires your car battery to be charged. Again, enough driving to charge car battery. As with a Voltage Cutoff from the A129 Duo Hardwire Kit (or whatever camera / hardwire kit), it'll shut it off at the voltage you specify.
Battery Voltage
12.6 = 100%
12.4 = 75%
12.2 = 50%
Never recommend going below 12.2 / 50%, You may find a car that won't start in the winter.
AGM Battery = $300 or so from googling
Battery Pack = $300
Pick your poison.