[gearhead]

I think we need more info on what you have. If you have a 120volt ac electric only residential refrigerator, and it was on, that battery life may not be too long. Like has been said, be sure your truck is charging it.
I was talking to a Keystone salesman 2 days ago. We were in a Montana with a residential refrig. I asked how long it would run off the battery, he said about 18 hours.