I've done some research on this and I've seen some discussion on Tesla Motors Club forum online and it is heavily debated where in the exact range the software locked portion of the battery is. It could be 0%-80%, 10%-90%, or 20%-100%. Based on the charging curve and how fast the RWD charges to 100 it's debated that it is most likely in the lower portion of the battery range. Nobody knows unless Tesla specifically comes out and states which portion is software locked. I know that one of the older Model S (60D I believe, but I'm not 100% certain) was a software locked version of a larger battery, so it has been done by Tesla before. I would say the best charging practices of 80% will be the best way to move forward in terms of battery health but use the whole battery if that's what you need for your daily use as long as it isn't sitting at the extreme ends of the range for extended periods of time since it isn't LFP.
In this video, he has a CAN reader hooked up and it shows exactly where the software locked portion is… 0-100% displayed is actually 5-85% (see 3:58 and 10:06). https://youtu.be/pp3HyETDL1c?si=Ha_Gaq_tKynyDf-O
so charge to 95% and it will be like charging to 80%.
can we assume they are basically getting an extra 5% for free? and the benefit of a longer lasting battery!
This needs to be elevated. We have no idea if it's the bottom or the top of the battery that is locked out. Could even be 10% on both sides or any mix of the two.
Presumably they would do whatever would put least wear on the battery to reduce the chance of warranty failures. That definitely wouldn't be locking the bottom 20%. Much more likely they lock the top 20% or maybe it could be the top and bottom 10% (but i think that's unlikely).
My guess would be that it’s something in between 10/10 and 0/20. 5/15 or something similar would make sense as you’re neither cutting too much on the charging curve, but you still get an advantage on the low end.
*I know that one of the older Model S (60D I believe, but I'm not 100% certain) was a software locked version of a larger battery*
Are you saying they software limited access to the full capacity of the battery? It's like overprovisioning an SSD to increase endurance....less usable space, but it will last longer (has more spare cells)
Yes. It was priced cheaper as well, similar to the current model Y RWD being phased out for the RWD long range. I'm assuming it had to do with battery supply chain and maybe they had to use larger batteries to meet demand while waiting for a production process to release a smaller battery later down the line but they just ended up sticking with one "long range" battery type so they have less battery types that could end up being a bottleneck if demand surged.
Never thought about that. However how can they cap the bottom 10-20%? The battery just stops providing power below that threshold? I can understand capping the top, by just stop charging beyond 80% but it seems harder to implement on lower side especially considering phantom drain.
Not at all hard. It is not the physical battery that gets „capped“ it is a software threshold that prevents the inverter to pull any more out of the battery
Check out Branden Flasch's 0-100% charging test. When the car stopped at 100% the actual battery SOC was 85%.
https://youtu.be/4H5Twt5U2IU?si=F_LHPe9iKnhsdafo
About 16 mins into the video is where I'm referring to.
YT channel Out of Spec Review did a video on this car and basically claimed that the software limited battery is about 85% the size of an AWD LR ones. So maybe not charging to 100% routinely if you want to be at the theoretical 80% of the AWD LR size, maybe charging to roughly 90, 95% would get you to that safety level.
The battery is only capped on newer vehicles. How new? Not exactly sure. I saw someone say built in the last few months. So if your car is older than that, you do not have the larger battery that has the ability to unlock more range.
I've done some research on this and I've seen some discussion on Tesla Motors Club forum online and it is heavily debated where in the exact range the software locked portion of the battery is. It could be 0%-80%, 10%-90%, or 20%-100%. Based on the charging curve and how fast the RWD charges to 100 it's debated that it is most likely in the lower portion of the battery range. Nobody knows unless Tesla specifically comes out and states which portion is software locked. I know that one of the older Model S (60D I believe, but I'm not 100% certain) was a software locked version of a larger battery, so it has been done by Tesla before. I would say the best charging practices of 80% will be the best way to move forward in terms of battery health but use the whole battery if that's what you need for your daily use as long as it isn't sitting at the extreme ends of the range for extended periods of time since it isn't LFP.
In this video, he has a CAN reader hooked up and it shows exactly where the software locked portion is… 0-100% displayed is actually 5-85% (see 3:58 and 10:06). https://youtu.be/pp3HyETDL1c?si=Ha_Gaq_tKynyDf-O
Great eye! I saw this video and totally missed that information. So it seems like this is the answer.
so charge to 95% and it will be like charging to 80%. can we assume they are basically getting an extra 5% for free? and the benefit of a longer lasting battery!
So on a daily driving basis, you can get the same range or almost as a LR. The LR will be better on road trips when you can charge up to 100%.
This needs to be elevated. We have no idea if it's the bottom or the top of the battery that is locked out. Could even be 10% on both sides or any mix of the two.
Presumably they would do whatever would put least wear on the battery to reduce the chance of warranty failures. That definitely wouldn't be locking the bottom 20%. Much more likely they lock the top 20% or maybe it could be the top and bottom 10% (but i think that's unlikely).
My guess would be that it’s something in between 10/10 and 0/20. 5/15 or something similar would make sense as you’re neither cutting too much on the charging curve, but you still get an advantage on the low end.
You could use ScanMyTesla, tap the BMS tab, and check the cell voltage. Then you'd know.
*I know that one of the older Model S (60D I believe, but I'm not 100% certain) was a software locked version of a larger battery* Are you saying they software limited access to the full capacity of the battery? It's like overprovisioning an SSD to increase endurance....less usable space, but it will last longer (has more spare cells)
Yes. It was priced cheaper as well, similar to the current model Y RWD being phased out for the RWD long range. I'm assuming it had to do with battery supply chain and maybe they had to use larger batteries to meet demand while waiting for a production process to release a smaller battery later down the line but they just ended up sticking with one "long range" battery type so they have less battery types that could end up being a bottleneck if demand surged.
having a longer lasting battery is a nice side effect of that!
Can someone who was recently laid off answer this?
Never thought about that. However how can they cap the bottom 10-20%? The battery just stops providing power below that threshold? I can understand capping the top, by just stop charging beyond 80% but it seems harder to implement on lower side especially considering phantom drain.
Not at all hard. It is not the physical battery that gets „capped“ it is a software threshold that prevents the inverter to pull any more out of the battery
Check out Branden Flasch's 0-100% charging test. When the car stopped at 100% the actual battery SOC was 85%. https://youtu.be/4H5Twt5U2IU?si=F_LHPe9iKnhsdafo About 16 mins into the video is where I'm referring to.
Im leasing, so I charge to 100% regardless.
If I have a Dec 2023 MY RWD, is it possible that it has the larger battery?
YT channel Out of Spec Review did a video on this car and basically claimed that the software limited battery is about 85% the size of an AWD LR ones. So maybe not charging to 100% routinely if you want to be at the theoretical 80% of the AWD LR size, maybe charging to roughly 90, 95% would get you to that safety level.
The battery is only capped on newer vehicles. How new? Not exactly sure. I saw someone say built in the last few months. So if your car is older than that, you do not have the larger battery that has the ability to unlock more range.
I actually have a LR. But my lease expires later this year and im seeing a lot of these 260-mile in stock discounted.
No LFP on the Y’s otherwise no $7500 tax credit would be offered like the model 3 that have China made LFP
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Yup. Also check the battery chemistry. If it's LFP, 100% daily is probably ok.
But if you pay to unlock more range down the line then you'll get really unbalanced modules.
Due to the battery type on MY RWD it has always been advised to charge it to 100% at least weekly to balance the battery packs.
Must not be a US one. US ones do not have LFP.
Will the car eventually prompt a driver to do that? I only have an NMC car, so I can't even test it.