ksnax wrote: ↑Sun May 17, 2020 11:15 pm...the i3 adjusts usable displayed capacity based on a formula and recent performance history. There really isn't any way to measure a battery directly for capacity. Voltage values are interpolated into range, but even a mostly cooked battery can still display full voltage or any value in between, so it is always just an estimate.
That furthers my point. The car is already displaying "false" capacity. 100% displayed = 96%, and 0% displayed = 10%. That's manipulation for the benefit of the driver.
So my suggestion is an additional manipulation.
Showroom new, my car goes 100 miles on a charge, so my SOC reads 100%.
Over time, through voltage measurements and logged data over thousands of miles of driving, using fancy algorithms and lookup tables, the car sees my battery has degraded 10% and maybe my average range has decreased to 90 miles.
In that instance, fully charged, my SOC would read 90%. It would never display any higher. It would be a very "in your face" acknowledgement that the battery had degraded capacity. If I sold the car, the buyer would have a very good indication of what they're getting into.
Make no mistake, this wouldn't be a "floating" percentage that would increase on warm days and decrease in cold days -- this would be a carefully tracked and "permanent" indication, that could perhaps be adjusted with a dealership capacity test, supposing that could provide more accuracy.