There is not a line in the sand where SoC + 0.00001 is "bad" and SoC - 0.00001 is "good."Kieran973 wrote: When I charge to 80% SOC on the dash, Leaf Spy says I have almost 90% SOC. So if the distinction between the dash and Leaf Spy doesn't matter, then wouldn't the distinction between 80% and 90% not matter? If so, why is 80% the max recommended threshold? Why not 90%? I agree that it's a lot more convenient to just use the dash than to take a Leaf Spy reading every time I plug in, but if Leaf Spy is the real (or more real) SOC, and 80% is the max recommended threshold for daily use, and I know that the dash will report an SOC around 8-10% less than Leaf Spy, then it seems like a better daily practice would be to not go above 70-72% dash SOC.
The key point you have to understand is that for a car being used most days, battery degradation will occur at about the same rate whether you charge up to 60, 70, 80 or 90% SoC as an isolated variable. The more important (by far) intervention is to minimize the time the battery sits at its peak charge. This is all the more true the higher the battery temperature.
Bottom line: charge after midnight for morning use. Avoid 100% charging when possible, particularly in the summer.
Avoid stuffing the car in a hot, closed garage.
During hot and sunny days, avoid parking the car on hot asphalt and letting it cook there. Walk for shade