Reported battery SOH improving over time, rather than the reverse?

[jray3]

I'm in the same boat as Bernard, south of Seattle with a 74 kilomile 2016 that hit 63.4% SOH on 1/27/22 when I set my dealer appointment for warranty EValuation.
A job change meant that I went from over 151 miles per day of driving (with 4 DCFC) to largely virtual work, and usage dropped to maybe 12 miles per day average in warming weather. By the time the dealer measured SOH, it was a freezing cold day but the BMS reported a lousy 70.3%!! Faced with my SOULSPY data, KIA of Puyallup opened a TechLine case and tested again the next day, but Corporate told me to come back later with a reading below 70%.
Appointments are still running 6 weeks out, so it'll be mid-April before I take another crack at the SOH meaurement.
At least I got a car wash out of the deal....

Hey Bernard, come on up to the Seattle EV Association meeting this coming Tuesday and we can compare notes. https://www.seattleeva.org/wp/

[IanL]

MY 2018 SoulEV reports the BMS SOH on the OBD interface, so SoulEV Spy would give the same value the dealer reads. The earlier model does not, and Spy calculates a value based on cell deterioration, which does not necessarily use the same method as the KIA test equipment, so may give a different value.

[jray3]

The saga continues. 63.4 SOH according to SOULSPY on January 27th became 70.3% at the dealer by March, and now on April 12th, it measures 70.6%! Warming weather and sitting at 100% seems to only boost this SOH algorithm.. For good measure I used it on a max range run the night before, and a full recharge from 15% SOC only consumed 15.1 kWH, The return trip down to 5% SOC was only 55 miles, with cautious 60 mph driving. if 15.1 kWH is 85% of actual capacity, that yields a capacity of 17.76 kWh, or 65.7% of the 27 kWh spec, but not low enough to satisfy this BMS.....