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 - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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