New dometic new gen is drawing more power than old fridge.

I will follow this thread to find the answer. We just bought an older travel trailer for fishing trips and it just had a new Dometic 6 cu fridge installed. Between the fridge and the furnace being on a couple times overnight the battery was dead before morning. I made a trip to town and bought a new battery thinking to old one was not up to snuff and the next morning the new battery was almost dead.
I have been scratching my head trying to find the power drain. The fridge was on propane by the way.