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They're balanced the most when;
a) They're on higher SoC
b) They have no load on them, potentially even when contactors are open. Even AC's 2-3kW of load would create a minor imbalance momentarily.
Overall you don't have to worry at all about Tesla's pack management as far as cell voltage balances are concerned. They are industry leaders by far on that. What you might need to worry about is advertised battery capacity vs real capacity. That was an issue when they were naming models with capacity (75-85-90) They got away with that now that they're only advertising an obscure 'long range'. Since you've got the new age Teslas (both M3 and MS you have are new) you don't have anything to worry about.
In general it would be better to just relax and drive, but Tesla has done some underhanded things with the batteries that warrant a closer eye. In the end, the battery is what the battery is, and for the most part you should be fine if you don't obsess about things like supercharging speed and tenths of a second 0-60.
Of course my statement will likely draw the ire of people who are incredibly upset about the speed at which their car charges or discharges, but in general these nerfs are not enough to drive people away from owning the car, so the anger does no good.
FWIW, my car's cell imbalance is also 3.97mv. This is at 73% SoC
View attachment 561041 View attachment 561042 Here I am attaching screenshots of SMT for both my wife's M3 and my MS (both 2020) .
Just wondering if this is normal or should I do a charge to 95% ? I think thats the way to get cells to balance, but please correct me if I'm wrong.
Actually, form all my reading it really appears that M3 is 90% and MS is 93% to initiate balancing, so I just figure ill do both at 95% to be sure. However any input is welcome, I love learning more about these cars !
Thanks
I noted you have obvious errors on the SMT range values. Try unchecking "Release 2020 or higher" under the wrench icon toolbar.
In my experience, I get fully callibrated, even after months of storage, going to 80%.
I have 10 times the imbalance you guys are reporting, unless I charge to 70% and drive. The lowest I have seen since March when I got SMT is 14mv.
Module 2, string 1 seems to be the problem child for me.
Not noticing any problems except my range drops about 6 miles when stored. It comes back up to 265 when charged and driven
I noted you have obvious errors on the SMT range values. Try unchecking "Release 2020 or higher" under the wrench icon toolbar.
Here are 2 I took today (for another discussion but i remembered this thread)
I see some changes but honestly it seems worse with out 2020 checked???
I would like to have 94 KwH Nominal, but I think the only way to get that for real is to buy a new car...
Much cheaper to just check the box though...
Without more information on your vehicle, such as vehicle/battery age, mileage etc... It's hard to really say. If your car is fairly new, 1 year or less, then that is terrible. If your car is 5+ years old or over 100,000 miles, than that is perfectly fine and part of wear and tear. My MX has a dead cell in a brick, and has been holding at 60mv for~5 years now (Tesla states normal and wont do anything...). Keep on chugging along. 20-30 is fine.Hello @lgli
I see your last post is 2 years old, but I have the same problem now. My HV battery imbalance has increased from 4-6 mv to 20-30mv in last month.
Was your 30mv imbalance a problem for your HV battery in long term? Have I to dig deeper and let my HV battery check for some fault?
Thank you in advance
Regards and Marry Christmas
Nico
Hi.Without more information on your vehicle, such as vehicle/battery age, mileage etc... It's hard to really say. If your car is fairly new, 1 year or less, then that is terrible. If your car is 5+ years old or over 100,000 miles, than that is perfectly fine and part of wear and tear. My MX has a dead cell in a brick, and has been holding at 60mv for~5 years now (Tesla states normal and wont do anything...). Keep on chugging along. 20-30 is fine.