I understand that but what im saying is if the guidelines are 50-80% is recommended for normal daily use then having it sit in 70% should be fine. It would be insane to me to think that even letting the battery sit at 70% for 12+ hours is somehow not good for the battery. Again we are not talking about letting it sit at 90%+ for 12+hours daily. If the batteries are that sensitive that you can only let them sit even overnight at 50-60% then we are screwed and as an advertisement that EVs are the future then it is not a good way to get people on board because most people don't just have 5-10 mile commutes every day.
Sure if you are only using 5% of the battery total and you have a starting point of 80% then why even charge every day. I wouldn't even bother. If you are able to charge to 50% everyday because you have a short commute...good on you. I don't charge my car every day even though I can with a home charger, I opt not to because its not really necessary. For day to day use I think as long as you are using the battery every day it shouldn't have a practical impact. I agree if you are doing long term storage that is a different story where you might not use the car for a 2-3 weeks to months.
Btw battery "degradation" happens regardless if you are charging every day to just 50-60% from day 1. There is no way to avoid battery degradation.
There’s a difference between something that’s distinctly “bad” for the battery and something that’s “better” for the battery.
The only truly “bad” things for the battery (ie may lead to premature failure) are running the HV battery completely dead and letting it sit for extended periods or leaving it at 100% for extended periods. Extended periods meaning weeks/months.
Other than that, the batteries in general are pretty robust and should last past the warranty period no matter how you treat it. If your goal is to simply have the battery not fail prematurely then there is zero need to give it a second thought. Charge to whatever you want within Teslas recommendations. 50% is fine. 70% is fine. 80% is fine. Even 90-100% is fine.
However, most of the discussions about battery charge limits and degradation is to try and
minimize degradation as much as possible so the battery stays healthy for as long as possible. As you said, there is no way to
prevent degradation, but there’s very clear evidence on ways to
minimize degradation.
So no, 70%, 80%, even 90% charge isn’t “bad” and won’t fry your battery. But 50-55% charge is
better if you want to minimize degradation.
Also there’s absolutely zero reason to not plug in every day if you have a home charger, even if you had only used like 5% that day. Instead of setting higher limit and running it down before plugging it back in, it’s better to set a lower limit and just plug in daily.
Obviously this doesn’t apply to people without home charging because that would be far too inconvenient to try and charge daily and keep it under 55%. I’m of the camp that doesn’t think people should even buy an EV if they don’t have work/home charging but that’s a different topic.