Based on my limited observation, the CAC does drop after a road trip. My theory is that when I'm driving close to home, the SOC rarely ever dips below 50% SOC. But on a road trip, I sometimes stretch down to 10% SOC to get to my destination or charger. When the SOC goes lower, the car now has more data to calculate the CAC.
So my theory is that the health of the battery slowly gets worse and worse, but car doesn't have enough data to calculate the CAC correctly. And when you go on a road trip, you're not degrading your battery all at once, you're just giving the car more data to calculate a more accurate CAC. The actual health of the battery has been slowly degrading but the car didn't have enough data to calculate or display it.
That's my theory anyway. Any comments or feedback? Does the road trip actually degrade the battery, or just improves the accuracy of the CAC?
your theory makes sense