Remember that when running on battery there are other users of electricity besides the fridge. The worst is the propane/carbon monoxide alarm which can discharge a good battery in a couple of weeks or so. Battery life also depends in the state of charge before going "dry". The fridge uses minimal power when running on propane. How old is your battery? Under normal conditions I would replace the battery after 4-5 years of use. If you do a lot of "dry" camping maybe sooner.
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09 GS Innsbruck 23BWL, 04 Dodge RAM 2500 Quad Hemi
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