From the research I have seen and discussed with experts, some of the recommendations on charging are not true. Actual list should be more like this:
- Avoid frequent quick charging
- Avoid frequently charging to 100%. Never leave the car at 100% for many days.
- Keep the car cool (easier said than done)
Low SoC seems to actually reduce the degradation, as opposed to many recommendation on the internet.
Degradation seems to slow quite a lot after loosing the first 10-15 %, so that is nice.
Mine Nissan Leaf is soon 11 years old (early 2014 model), now with a SOH of 81 %. Admittingly, the degradation is reduced to some extent here in Finland due to us having only 2-3 warm months per year...