How long did the battery last in your Challenger? Mine is 4 years' old and is having trouble handling the freezing weather.
At that point I'd just keep going to see how long they actually could go. No, we never want to get stuck but that's a long time you had.Not Challengers per se' but the battery in the wifes Pacifica was 7 years old and still working when out of an abundance of caution, I replaced it last week because of the impending Polar Vortex. The batteries in my 2500 were 11 years old when I replaced them last year and yes, they were still working as well.
At that point I'd just keep going to see how long they actually could go. No, we never want to get stuck but that's a long time you had.
Does getting a battery load test tell anything useful? My battery is just under the 5 yr mark, but I recently got it tested. It came out as "good" rating (about 70% of rated CCA, if I understand the scale). I asked if I should be concerned about replacing it soon, and he said nothing to worry about for now. He also said that it is possible our batteries will live longer than "normal" because, being situated in the trunk, they aren't subjected to the regular/extreme heat cycling in the engine bay. What do you guys think?