My guess is that there's some variable which accounts for some change in the environment (maybe even temperature change over time). I've gotten this when driving uphill at around +8C (46F), just after dark, and I assume a temperature drop. All of a sudden like 10 percent of SOC disappeared within less than a minute.Do you think the vast difference in ambient temperatures have anything to do with the soc? I went from leaving in 108 degree heat to 80ish compton to 74 degree Orange County. I would imagine the bms would handle that with all the cooling tech onboard this ain’t a leaf.
How does the battery heater work? Is it separate from the cabin heater? Maybe the PID in the system is predicting that the temperature is going to drop further, fires up the battery heating and adapts the guess-the-soc based on the new conditions?