So just assume that the bottom 10-20% isn't there and either:
There isn't any clear owner data that 'unnecessary degradation' is occurring regardless of the charging strategy.
@AAKEE has posted plenty of data showing degradation at high SoC levels. This applies to LFP batteries as well as NCA.
You mean all ~260-355 miles range (depending on speed, weather, etc.)? Nope. What am I going to do? Drive over to Nevada because there was an earthquake? Why would I do that? Most I have ever needed on short notice was around 50-60% of the range. And that was to get to where I needed to go and back. I could have charged somewhere at my destination if I really had to.
As another pointed out, the uncertainty that affected LFPs is only 10%. OP can add 20% for even more margin. I don't see the point of needing the car always close to 100%, especially for a LR.
I'm making a 20 mile trip to my dentist and hop on the freeway. The traffic suddenly grinds to a halt and after a few minutes I call and cancel the appt. An hour or so later the traffic starts to move, and then the RCMP routes everyone over to the opposite side of the freeway and I get home about 5 hours later.... A chemical spill closed the freeway.
When there's a flood, you flee to higher ground. Which is a hell of a lot closer than 200 miles away.
So the car is saying that "83%" could really be as low as 63%, and that 63% will only give you 72 miles?
Well if you are using 190kWh you are driving a fair bit going by what I'm showing for my car.
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When the entire town is a valley, and you have only minutes to flee, just how far are you going to make it before the flood drowns you? While you are on foot and haven't even reached the hills yet...I think that's why @DuncanM laughed
The BMS will correct itself when the car is charged to 100%. There's no permanent damage done.
Your nearest evacuation zone is 200+ miles away? I think that was the point. Very rarely do people need to flee 200 miles, it's simply not a reasonable margin to leave for most people (keep in mind OP only travels 25 miles per week and also in California).When the entire town is a valley, and you have only minutes to flee, just how far are you going to make it before the flood drowns you? While you are on foot and haven't even reached the hills yet...I think that's why @DuncanM laughed
Not everyone is in snow country, and even for most areas that see snow, they don't see it every day of the year. For most people charging that high is only unnecessarily putting extra wear on their battery.
The key point is not the range remaining in the battery, but having a reliable estimate of the remaining range, which is only possible in an LFP battery that is regularly charged to 100% to allow the BMS to accurately estimate SOC. However, if keeping the battery at a high SOC doesn't harm it, then why not do it. Events that present a threat to life and limb tend to be rare, but those events are when you're most likely to need your vehicle and when the charging infrastructure might not be available:
www.teslarati.com
This was addressed in another post, but the inaccuracy is at the bottom 10%. Just add that to whatever margin you have set. There is no need to charge to 100%. It's not like without charging to 100%, it will suddenly drop to zero while you are at 50%. Just assume the bottom 10% is unreliable (or as others mentioned can raise to 20%).
There is not enough data either way for M3 LFP batteries specifically given how young they are (it's only been about a year since they shipped to the US), but it's been linked up thread LFP batteries in general still have worse degradation at higher SOCs (as others pointed out even in reports done on the same CATL LFP cells). They do better than NCA (and have better cycle life in general), but the impact is not zero.However, if keeping the battery at a high SOC doesn't harm it, then why not do it. Events that present a threat to life and limb tend to be rare, but those events are when you're most likely to need your vehicle and when the charging infrastructure might not be available:
Tesla to unlock extended range for vehicles affected in CA wildfires
Tesla owners living in areas affected by the ongoing CA wildfires will be able to tap into the maximum range offered by their vehicles, even if they purchased trims that feature a software-limited battery pack. The update was confirmed by CEO Elon Musk on Twitter Monday morning. With this...
There's no evidence, based upon multiple user reports, that charging a M3 LFP battery to a daily or weekly 100% SOC, causes increased 'wear and tear' on the battery. Degradation seems to correlate to battery age and miles driven.
There have been 100s of thousands of LFP M3s sold and there's just no owner data indicating that keeping the actual M3 battery at a high SOC increases degradation. If there was consistent data showing increased degradation due to keeping the car at a high SOC, we'd know about it by now.
No you won't, because the calendar degradation doesn't show up yet. One year is not enough data to determine that. Cycle life also is not tested enough yet. Having 100s of thousands of samples is irrelevant if few of them have lots of miles on it or have the calendar wear on it yet.
