Yes, it needs some 12vdc to run the control circuitry. It doesn't use much, but when the voltage drops, the fridge is dead. Once the check light comes on, you must recharge, switch batteries, whatever or the fridge will begin to slowly warm up.
That's why we preach using as little 12vdc as possible when dry camping. If you are not conservative with lighting alone, you can run the battery down in just a couple of days.
In the spring and fall, the furnace is a big user of 12vdc.
There are a number of threads already here about 12vdc conservation. They make excellent reading. Most of your questions likely already answered in those threads.
These fridges are very slow to recover. It may take a full day to get it down to temp when first firing it up. Standing with the door open trying to decide on a snack is unwise as you'll fill the interior with warm air. Unlike home fridges, there is no circulation by 110vac fan, and the cooling process, while efficient, is much slower than we are used to with our home fridges.
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