This is a research/test which used actual Model S 18650, from a Tesla that was used for 6 months since new. Report from 2017. so maybe a 2015 or 2016.
I have had this report for a while but if I remember it right, I havent used this as reference before.
Remember, this is not a question of finding one specific report showing something, it is the sum of reading more than 100 research reports, and disregarding a few of them. The rest, still more than hundred, builds the case.
Note, that the calendar aging is highest at about 80%, a thing I have been writing about for quite long time.
Also note that 50% and below have
significantly lower calendar aging.
For warm climates, it will be a considerable difference having the cells at 55% or below.
These numbers match the other reserach quite well, I calculated that the step1 and step2 cyclic aging must have taken about half a year, so these numbers is for month 6-12 in the cars age.
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Tesla Model S18650 test
This is the cyclic test of the same cells, confirms that the degradation per cycle for full cycle (100-0%) is in pair with virtually all the other research.
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As this test only had four datapoints for calendar aging 20-50-80-100, it will hide the true form of the graph.
Using this graph that do not hide the step that is caused by the central graphite peak as it use 16 SOC points we easily can se that it is benifical to stay below 55% - Actually, reading that report show us that the real step is at 57-58% on a new NCA cell. Tesla hides 2% SOC on model 3/Y at 55%(part of the buffer is hidden there) så charging to 55% keep us on the right side of 57-58%
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