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2021 Modle Y. Losing 3% (8 miles rated range) overnight after 2021.4.11 update. Sentry mode off. Ambient temperature 50F (10 C). No FSD

Hi Guys, Looking for some help here.

After the latest update. I am losing a lot of battery range overnight, over 14 h. 3% lost (8 miles). car is parked in a garage. Sentry mode off. no scheduled departure. no FSD. Temperature definitely would not trigger overheat protection. No third-party app access. No tesla app access.

Anyone experience the same thing? Tesla tech support said that the car needs time to adjust after a software update....but it had never happened on any other updates.

Anything I forgot or missed?
 
The battery meter range estimate is not that precise and may be influenced by external factors such as temperature. The other day I supercharged my car and stopped at 88%. As pulled away from the parking garage, it went up to 89%. I had lunch and came back and it was up to 91%. Don't read too much into small changes. It is just an estimate.
 

pt19713

Active Member
Feb 5, 2020
1,056
1,387
Delaware
I pulled some info from my car, only seeing 600 watt loss over 14.5 hours, or roughly 40 watts/hour.
Temp in my garage 51F. No sentry, no FSD, TezLab third party app, 2021.4.11 software.

1615989794608.png
 
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MY-Y

Active Member
Mar 4, 2020
1,314
1,563
MD
I think you'll find you have one rated mile for every 239 Wh reported in the "nominal full pack value." The Wh/mi was lowered in an OTA update shortly after the advertised range went from 316 to 326. My car gained 7 rated miles with that update. It seems to include the ~3.2 kWh energy buffer. Even driving very efficiently at 239 Wh/mi, the car will report 0% with the buffer still able to go ~13 rated miles.
 
The battery meter range estimate is not that precise and may be influenced by external factors such as temperature. The other day I supercharged my car and stopped at 88%. As pulled away from the parking garage, it went up to 89%. I had lunch and came back and it was up to 91%. Don't read too much into small changes. It is just an estimate.
Is this because when you supercharge the car the battery gets so hot that even after dropping down the % it will go back up because of the battery heat?
 

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