I replaced an 6+ year old AAP battery because it was stone dead after sitting ~3 weeks unused. It was kept on a maintainer during the winters and ran for a couple of months this year afterwards without issues. I figured the battery was just getting near the end of it's life. Bought a Motorcraft Battery and trickle charged it before I installed it. All was good voltage was 12.6 with the vehicle off. It started immediately for a couple of weeks, even letting it sit for a day or two without use. It sat for 3 days without use and was totally stone dead again. The Contour is a "primitive vehicle" by today's standards so I can't imagine a huge parasitic power draw over 3 days instead of 2 days to totally kill the battery all of a sudden without warning??? If I can charge it up with my trickle charger I'll see if there is a large parasitic draw with the vehicle off. My other thought is it's just a bad made JC Mexico battery that died shortly after beginning it's use. What a pain it's blocking my "working" vehicle in the driveway.
Whimsey
Whimsey