Many fridges are 3-way, meaning they run on propane, AC, or DC to produce the heat that fuels the cooling cycle. Most fridges after 2000 also have a computer board to automatically switch from one mode to the other, monitor the safety systems, etc., which is always on and uses a little DC power, but not much.
The fridge cooling on DC would suck the batteries down in way less than 4 days. Closer to 4 hours.
Even the radio would suck the batteries down in way less than 4 days.
I'm thinking the most obvious cause is one or more weak batteries. Like John T said, a weak battery will suck down the good battery and ruin both of them.
When you replace the batteries replace BOTH! If you just replace the "bad" battery, the "good" battery will become "bad" very soon and ruin your brand new battery. Then you will get into this vicious cycle of replacing the "bad" battery, back and forth, until you get wise and replace them both at once. Just skip the whole learning experience and do both at the same time.
Look into replacing your lights with LEDs too. They use very little power and will stretch your battery capacity even further.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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