Let me start with I love my Telsa. I have not illusions about the battery lasting forever. I have seen a regular and expected degradation of the battery over its life and that to date has not concerned me. With that out of the way, this recent cold snap (-4 degrees F) stole 10 miles from my battery's range. I am starting to get concerned about driving between charging stations (in the midwest - Indiana) at highway speeds of 75 - 80 mph, which is the norm. My Model S is 5 years old so I am curious about when is it time to replace the battery? How much will this cost? What is the resale value of an older Tesla a few year from battery replacement? Are there any experiences out there to guide me? Thanks in advance.