Consistent drops in SOC every time vehicle is turned off and on.

[A.K.]

Hello,

I'm looking for advice on strange behavior I was able to observe on my Kia Soul EV 2018 (30kWh, 80Ah battery). Every time I turn it off and on again the SOC drops around 2.5%. It looks like it must stay in off state at least for some time for this to happen, but I have not determined minimal duration yet. The drop is more or less the same value irrespective either it was due to quick visit to supermarket, overnight stay at home or whole day parking at office. I checked it with Soul EV Spy and could see corresponding increase of around 0.8kWh in accumulative discharge power. The accumulative operation time also increases. I could see it going up by value starting from time car was off till about 2 hours.
So it all looks like car is having some kind of secret life by itself. I wonder if that is known behavior and part of normal behavior or should I worry?

 

[JejuSoul]

You don't give us enough info to make a guess.

Examples
Do you live in Northern Canada or Alaska? My guess - battery heater.
Do you live in Dubai? My guess - battery fan.

At what SOC was the car when this happened?
Do you live on top of a hill?
Have you looked at the data for the 12V battery? Is it being charged?
Have you looked at the cell voltages of the main battery. is re-balancing occurring.