I am running a DEKA Group 31 AGM battery in the stock location in my FJ cruiser. I have a Dometic CF-50 fridge that has lived in the car non-stop for the past 3 years. Only had one dead battery when I fell asleep by the campfire with the stereo playing all night. Otherwise no issues. It often sits all weekend and starts strong come Monday morning. Weekends in the desert in 90+ degree temps, etc. don't seem to phase it. I've accidentally left the fridge running for 3-5 days when I fly out for business trips and it has always started strong when I return. I'm thinking about adding a 120w solar panel to my roof rack and a charge controller for a little extra piece of mind, but for the past 3 years I've had no need for it.