Thank you so muchA full battery test takes a little over an hour by Ford, it sounds they are only doing a quick test. In my F350, I run a 850 CCA Battery when standard is a 650. I had a new 850 ( with 6 yr warranty ) from Ford and within a year, my truck wasn't starting in the mornings. I had it tested a couple times at Ford and they said it was fine. It continued it's ritual in not starting so back to Ford I went. The Service Manager said I could have a full test done which would take 60-90 minutes. If the battery was bad, they would replace it under warranty, if it was good I had to pay for the test. It had 1 bad cell, I got a new battery. So ya, you can buy a good battery and they still can go bad. If you don't like one dealer, try a different one.