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I run a Engel MT35F Fridge/Freezer (set to operate as a fridge, not a freezer I might add) from a second battery (Exide Maxxima DC 900) fed from a split charge in my Discovery. Fully charged the battery will run the fridge for over four days without a further charge from the Disco.

I have fitted a caravan (12S) socket on the back of the disco that is hooked up to the second battery - when camped I carry the fridge into the tent (just so it's easier to get too then running back to the car when you need something) and use a trailing lead from the disco to provide the 12v electrics to the fridge and further sockets for phone charging etc...

J

Coolboxes will kill a vehicle battery. They draw a heck of a lot of power and in doing so, will warp the plates in your battery when you let it discharge too low.

The best plan is to run them on a hook-up with a voltage regulator - Cool Box Power