Can you share your source for what you believe is more compelling and authoritative on the subject?
The Tesla community has a problem or two:
-
Not reading the manual but using
not correct info from forum/facebook and taking these as true facts. (For example, saying that Tesla recommends 80 or 90% as the daily charge to a LR/P. The manual on all LR/P says ”to under 90%” which per definition is *any* setting below 90%).
- Thinking that Teslas advice is solely given to reduce degradation.
The combination of these, thinking that Tesla says ”you
should charge to 90%” and believe that this comes from the ”keep degradation at a minimum” casuses a few issues. Charging to 80-90% and thinking that this i “babying” the battery. Its not.
If we combine the sum of the research /test results we can see that Teslas advices is easy to understand. They are not mainly based only on keeping the degradation low, in fact this is a minor part. The advises is mainly made to be very few, and to be applicable in any situation and to give you the most use of the car without needing to have any knowledge of batteries.
I recommend everyone to read Teslas advices for their own cars, reading what actually is written and not trying to assume anything else. Its not much, and it is easy to understand.
There’s no advice not to leave the car at 100%.
Theres no advice not to drive down to low SOC numbers.
Theres no advice about best charging level between 50-90%.
There is a lot of rumors/myths though:
-“If charging to 100%, you need to drive asap, otherwise the battery degrades fast.”
This is not true.
- “Tesla say we should charge to 80%”(90% is as common myth).
This is not true. “AWD vehicles: keep the full charge limit of the battery to under 90% for Daily use.”
-“Its not healthy to go below 20% SOC”
This is not true.
I can say this and be very sure that I am not wrong. The research that is very massive is in 99% of the cases very agreeing on how and what degrades the batteries. The last 1% of research either has the wrong conclusions or have a test setup that hides sone facts. In some cases thY have made wrong assumptions leading to wrong conclusions. In 95% of these 1% the actual test results are in line with all the other results, but only the conclusions is wrong.
All research together, there is no research showing even the smallest sign of that 100% SOC is very bad or that 80-90% causes low calendar aging or that low SOC like below 20% is bad.
All the statements I call myths, are things which you can not find any qualitative facts that support those myths.
Its not good to try to find battery facts on sites that report on EV cars and news. In many many cases, the reporters are lured by the myths as well.
Saidly enough, battery university has some clearly debatable “facts” and clearly was fooled in some case by using a not that good research report. They have good information as well but if trying to find facts its not really easy to distinguish the good facts from the myths.
I plan to make a internet site with facts only built on the research. When I get the time to do that I do not know. The plan is to refer to a lot of research to build the case.
I do not think there is one solid place to learn the correct fact about batteries at this time.
The best thing is to read research reports, and as there is very many I could recommend one that is massive but covers very many aspects, and is from authors that have a solid pack of reports that do not have any clear flaws.
Good Research report (Yes, it is written in english, just skip two pages of german foreword).