Calendar aging = [Time x Temperature x SOC].I don't doubt that batteries degrade over time and that there are a number of variable which impact the rate at which this occurs.
Is it not the case that 'calendar' aging happens whatever (we can't stop time!) and other factors - temperature, state of charge the battery is held at for prolonged periods, frequency of DC charge etc etc will compound this further to greater or lesser degrees?
The rest, charging AC/DC and driving is cyclic aging.
What I was questioning was the assertion that a car with a low mileage will likely suffer more battery degradation than a similar aged car which have covered more miles? Is this indeed the case?
Not defenetive. But it is wrong to think that a low mileage car must have less degradation.
A battery “parked” at 80% or so has noticable calendar aging in normal temperatures.
A car driven normally or maybe more might spend more time at lower SOC which reduces calendar aging.
Having the car as much time as possible at or below 55% (60% for LG NMC, and 70% for LFP) will about cut the total degradation in half, or better.
This is my M3P after 2.5 years from new ( blue line). Except for a period (visible) where the BMS was off, the displsyed range was very high compared to other cars.
Last 100% charge was 492km range (driving to sell it), when the average was 460-465km. 507 km EPA, so the average range loss was more than double on the other cars.
This is my Plaid. Red markings by me. Still full range.
14 months since build date, 20K km