Puzzled by battery % drop after parking for 30 minutes.

[SSonnentag]

I was on my way home, and stopped at a grocery store with 14% battery being reported by my S 100D. After shopping for about 30 minutes I returned to the car to find it reporting only an 8% charge. The temperature was about 55 F and I had been driving for 170 miles before stopping at the store. What is the cause of this 6% drop over 30 minutes? The climate controls were off in the car, and the battery had to be nice and warm after driving 170 miles at 70 mph. Any ideas?

I drove the car 3 miles over to a supercharger where it reported 7% battery when I plugged in.

 

[gaswalla]

I've definitely experienced the exact same - happens when you drive a long distance (Eg drive continously from 90 percent to 15 percent).. After car sits for a bit, a huge drop in range may occur. I attributed this is to incorrect battery calibration during the drive...
Other experiences or input?

 

[Ames]

I had the exact same problem on a couple of occasions with my P90D. Arrived home with 13% charge, then about 15 minutes later got a message from the app saying the charge was very low...had a look and it was 7%. In my case ambient temp. was around 85 f which should not impact the battery soc significantly on cooling.

I did call the sc but didnt get a call back yet.

It is a little worrying if I cant depend on the last 6-7% during a road trip. I have noticed once before odd behaviour where the power limit lines flicker on and off on low charge. I am worried I have a faulty module.

Alex

 

[Tam]

...6% drop over 30 minutes...

Just a wild guest that after 30 minutes, your battery is cooled down enough to revise the range at ambient or lower temperature rather than normal driving temperature.

I guess if the battery is low, to keep the range consistent, don't stop unless it's a charging stop!

 

[whitex]

I used to get warnings in my 2015 S when stopping with low % after long drives, something along the line that the car can lose more range while parked. Last I saw one of those was probably 2 years ago, but then again, I haven't dropped to sub 25% SoC since then.

 

[jonm93]

Perhaps the cooling system for the drivetrain may have still been running to keep the motors and battery cooling after extended driving? The combined with the lowering of the battery temperature might explain the range loss.