Your 275 km seems to be lower than 98% NEDC range (75% of 367 NEDC km).
210m = 338KM. So 275km = 81%, so I appear to have lost 19% of my range.
When was the last time you could get 100% charge an what was its range in km?
You know I'm not sure it's really ever been to 100%. I believe it was 100% but the difference between 98, 99 and 100 may not be noticeable when you only view the charge level in terms of rated range, rather than as a percentage. But I believe it was around the time I bought the car, just over a month ago. I think I was getting around 280 - 285km. I have never seen it above 300, that's for sure!
It's possible that it already reached 100% while you were sleeping and it gradually went down to 98% in cold weather and that's what you see when you woke up.
Yes that is possible.
What I am really trying to determine here is how much of my battery capacity has been lost to the cold, and how much has been lost to degradation.
If we assume that the charge indicator (the one that tells you how many extra miles/km/Kwh is shoved in the battery) is both accurate, and NET of inefficiencies, then all indications point to a battery capacity of approx 52kwh. I am basing this on the following
With a range of 275km, and a rated consumption of 188wh/km, you get 51.7kwh.
When discharging to 6km of rated range, I was able to add an additional 50kwh of charge overnight
When discharging to 10km of rated range, I was able to add an additional 49kwh of charge overnight.
With a usable capacity of around 58.5kwh, my batter appears to have lost around 6-7kwh of capacity, or around 11-12%.
Now there is still some discrepency over how many kwh was charged and discharged. The car only reported 45.9kwh of usage yesterday, and yet I was able to add 49kwh of charge to my car. So there seems to be 3.1kwh missing.
So.. is my 11-12% lost capacity during charging explained at least partially by the cold? Or is that degradation?
And is that 3.1kwh that is unaccounted for.. was that lost to the cold while it was parked outside for 4 hours? Or was it consumed by my car heating itself, but not counted in the car's meter when displaying energy consumed since last charge?
Overall I have around 17% of my batteries capacity missing, and it has me somewhat worried.