[chidu07]

Hey guys,
We just released a new video that details the battery balancing process on my 2022 Model 3 Long Range (not to be confused with "recalibration").

EDIT: after uploading the video yesterday, a technical error was brought to my attention regarding my description of the balancing process. I truly want the content to be accurate, so I'm going to make some tweaks to the video and re-upload.

when are you reposting the video please?

 

[Happy Intruder]

Hey guys,
We just released a new video that details the battery balancing process on my 2022 Model 3 Long Range (not to be confused with "recalibration").

EDIT: after uploading the video yesterday, a technical error was brought to my attention regarding my description of the balancing process. I truly want the content to be accurate, so I'm going to make some tweaks to the video and re-upload.

where can I find the video? thanks

 

[damian.cast]

I would love to see the video, but I can't find it on this thread.

 

[tivoboy]

I have a 2018 M3 LR. It was spec'd at 310 miles with 19" wheels. Best ever was 308 shortly after delivery.
About 2 years ago, it was down to 280 miles at 100%. I left it at the service center for some warranty work and right before a holiday weekend, they finished the car and left it plugged into a L2 charger, and set it to 100%. I watched this for 36 hours on the app, all pxxxxxd off at the car charging to 100% and sitting there like that all that time.

But when I picked up the car, at first very very angry at them, the miles at 100% were up to 290 miles.

Back then I suspected something like balancing happened, but my anger at the car sitting there that long at 100% changed to happiness. Perhaps its time to try the 100% thing again.

That sounds odd, since my 2018 M3 LR with 18” AERO cover wheels was rated at 310. I would imagine that the 19” would be less because, A) larger and heavier and B) no aero would technically be rated lower by 3-5% overall.

 

[SkagitDoug]

Hey guys,
We just released a new video that details the battery balancing process on my 2022 Model 3 Long Range (not to be confused with "recalibration").

EDIT: after uploading the video yesterday, a technical error was brought to my attention regarding my description of the balancing process. I truly want the content to be accurate, so I'm going to make some tweaks to the video and re-upload.

Will you please direct us to the video, again?

TIA!

 

[NR4P]

That sounds odd, since my 2018 M3 LR with 18” AERO cover wheels was rated at 310. I would imagine that the 19” would be less because, A) larger and heavier and B) no aero would technically be rated lower by 3-5% overall.

There was an OTA range bump to 325, for 18" wheels. Think it was fall 2018?

 

[FRC]

There was an OTA range bump to 325, for 18" wheels. Think it was fall 2018?

This was for RWD models only.

 

[tivoboy]

This was for RWD models only.

Yes, it was a software update, but as quickly as it arrived, it just as quickly went away (with either the next, or the next NEXT update)… so I don’t think that was a new higher updated EPA rated range that was ever truly confirmed or official…

 

[NR4P]

This was for RWD models only.

Yup, thats my model. The first 3s were RWD and LR with initially 310 mile spec and then the OTA bump to 325.

 

[PNWmisty]

I haven't been able to view the video yet, but my understanding is it might also be necessary to draw the battery down to 10% or less before charging to 90% or 100% (in order to really re-calibrate the state of charge optimally).

 

[SimonMatthews]

Deleting ....

 

[IceMan8247]

Will you please direct us to the video, again?

TIA!

After posting the video, I communicated with a Tesla charging expert and realized I had a few technical errors. The whole point of the video was to help clear up confusion, and I felt a video with a technical error was doing the opposite, so I removed it from YouTube.

At some point over the next week or two, I plan to fix the video, but I am terribly busy at the moment.

I was hoping the mods would remove this post to avoid confusion.

Is it possible for me (as the creator) to delete this post?

 

[IceMan8247]

Hi Iceman8247, not sure why, but I don't see the video in your post. Can you direct me to where to see it. Thanks

Hey man,
Yes, I am away from my office and have not been home to update the video. I realized after posting it had a technical error, and I dont want to add to the already confusing subject by posting a video with an error, so I removed it.

I feel like this post should be removed.

As soon as I fix the video, I will re-upload. But honestly, it’s going to be a week or two. Sorry guys.

 

[garsh]

Is it possible for me (as the creator) to delete this post?

I'd prefer that you edit your first post. Deleting it would cause this entire thread to be deleted, and I'd rather that the discussion remain.

When you get around to posting a new video, you can update the first post to point to it, as well as add a reply to this thread to let current subscribers know of the update.

 

[Jrogern]

I'd prefer that you edit your first post. Deleting it would cause this entire thread to be deleted, and I'd rather that the discussion remain.

When you get around to posting a new video, you can update the first post to point to it, as well as add a reply to this thread to let current subscribers know of the update.

I agree. When the video is ready just do an update. Thanks

 

[SalisburySam]

In the interim @IceMan8247 could you simply point out textually what the errors were?

 

[IceMan8247]

In the interim @IceMan8247 could you simply point out textually what the errors were?

Yes - my video indicated that current flowing from the charger after the car reached 100% SOC is an indication the pack is balancing.
However, I have since learned the BMS switches from a constant current mode to a constant voltage mode during this final stage, which is why the current flows and gracefully tapers down to zero (not because the pack is balancing as my video indicated)
The balancing process is more nuanced than I originally thought, and it will require a fairly intricate video with a bunch of new animations for me to explain it as I’m envisioning.

I used the article below as my source, and I now believe this article does not tell the whole story:

Tesla battery management system (BMS) calibration

Tesla battery management system (BMS) calibration instructions

tesla-info.com

 

[Rub"Y"]

Your description may not be that misleading. The thing is the BMS is always balancing it just does a better job when the battery designated voltage is reached. This may still not be the cells peak charge voltage but it was decide by engineers better educated than me on the subject that a peak voltage needed to be set to be safer. I believe when this voltage is reached the software switches to constant voltage and the BMS continues to draw current to top up the cells needing it. After I did the 100% charge, mine showed no difference but after several charges my range is up to 415 Kms from 408 @ 80%. So in the end it did help. Next is to let it drop down to 10% and recharge to 100% then wait a week for the results. I will let you guys know when I do this experiment. I have a 360 Km run to do soon and will take the opportunity to try this.

 

[IceMan8247]

Your description may not be that misleading. The thing is the BMS is always balancing it just does a better job when the battery designated voltage is reached. This may still not be the cells peak charge voltage but it was decide by engineers better educated than me on the subject that a peak voltage needed to be set to be safer. I believe when this voltage is reached the software switches to constant voltage and the BMS continues to draw current to top up the cells needing it. After I did the 100% charge mine showed no difference but after several charges my range is up to 415 Kms from 408 @ 80%. So in the end it did help. Next is to let it drop down to 10% and recharge to 100% then wait a week for the results. I will let you guys know when I do this experiment. I have a 360 Km run to do soon and will take the opportunity to try this.

Thanks for the update! Glad to hear you gained some range back.

I agree the original video was mostly accurate, but I can do better and I really want the content to be as accurate as possible to avoid creating more confusion on the topic.

There was another misleading aspect of my original video I haven’t discussed on this forum yet: I originally suggested the BMS balances the pack by actively topping off the low cells. However, upon further research, I’ve learned that small bleed resistors are actually used by the BMS to balance the pack by lowering the cells that are the highest. This brings the cells into alignment (at a SoC slightly under the charge limit) and may explain why any range gained often shows up after several charge cycles.

If anybody reading this wants to try the process that was described in the original video (now removed from YouTube), just follow the instructions in the link provided in the article below. This was used as the source material for the original video:

Tesla battery management system (BMS) calibration

Tesla battery management system (BMS) calibration instructions

tesla-info.com

 

[NR4P]

Some feedback after re-testing the 100% charging theory.
22 MX 7 seats delivered with 348m range, as spec'd.

May 2023, 13K miles, charged to 100% L2, showed 331 miles, 5% degradation.
Last week, charged to 100% but let it sit 4 hours, and then showed 334 miles, small increase, encouraging

Went on long trip including SuperCharging, max to 90%.

Before returning home, charged to 100% L2 but only let it sit 30 mins. At this point, car and App showed complete but charger showing some charging going on with lights progressing. Time to leave so that never finished.
Now car showed 337 miles, so degradation improved by 2 points, to 3%.

Happy to see improvements but for now, I see no need to continue. I drive with % and may revisit in 6 months.