What you are seeing is not the Battery Capacity. It is just an estimated EV range miles when the battery is fully charged. As many of us joke about this so called "Guess-O-Meter", it is extremely inaccurate for predicting the future performance of the EV range. It uses the past data and current environmental factors, but it says nothing about the battery capacity.
I purchased my 2022 PHEV at the end of Nov when the temp already started to drop to below 32F. Initially I was seeing 35.5 miles
for full charge EV range which was close enough to the EPA rated 38 miles. But it dropped precipitously during the colder first few months of drivings, all the way to the lowest point at 22.7 miles
in beginning of the Feb when the temp was always in teens F or below at ODO ~1500 miles on the car. Since then, it has started improve as the temperature moderated. Just last week, with temp above 32F, the full EV range jumped to 57.7 miles
for a full charge EV range at ODO ~2100 miles on the car.
I would not worry about the EV range displayed on the dash fluctuating wildly.
View attachment 83033
View attachment 83032