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

[diablo0388]

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?

 

[mark95476]

Nope. I sometimes get a ~1% change. My car is parked outside.

 

[Arktctr]

Nope. I sometimes get a ~1% change. My car is parked outside.

Same...phantom drain has been pretty minimal in my 2020 Y vs my 2018 Model 3 before it.

 

[MY-Y]

Maybe you didn't actually lose 3% and that the cause is your battery was a lot colder in the morning.

 

[Sebat4]

Sometimes my Y says that my batter is at 59% but its cold so the actual battery is 62-63%.

 

[ATPMSD]

Evaluating a small battery loss using percentage is a a coarse evaluation. I suggest you change the display to "miles" instead In my car 3% is equal to 12 miles.

 

[Stingray.Don]

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]

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.

 

[MY-Y]

I'm hoping that "nominal full pack" number is low because of the cold too. I'm just over 70 compared to a new 77.8.

 

[pt19713]

I'm hoping that "nominal full pack" number is low because of the cold too. I'm just over 70 compared to a new 77.8.

the 77.8 kWh isn't fully usable? The nominal when new was around 75.2 kWh iirc. ~ 2 kWh degradation at the moment, which is expected.

 

[MY-Y]

I think it's 10% for me. 326 miles rated range is now 295. My pack is reporting 70.4 kWh. 326/295*70.4=77.8.

Is your rated range down to 309? (73.7/77.8*326=309)

 

[pt19713]

I think it's 10% for me. 326 miles rated range is now 295. My pack is reporting 70.4 kWh. 326/295*70.4=77.8.

Is your rated range down to 309? (73.7/77.8*326=309)

Mine fluctuates between 306-315

 

[MY-Y]

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.

 

[mark95476]

This is a good point. OP might get range back after the battery warms up after driving.

Maybe you didn't actually lose 3% and that the cause is your battery was a lot colder in the morning.

Sometimes my Y says that my batter is at 59% but its cold so the actual battery is 62-63%.

 

[Jsond]

I lost some battery range with the most recent update. About 8-10 miles.

 

[Firepot]

Same. Noticed a 10 miles lost this morning. 2021 LR, parked in garage, and sentry mode off.

 

[Sebat4]

Maybe its the update that some people had couple weeks back that didn't work right and during that time my battery was draining too. I think one night it dropped around 8% because my Y would wake up constantly throughout the night.

 

[Sebat4]

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?