I have posted this elsewhere, but didn't realise this was the best place, so here it is, with a slight update:
I have just bought a 2 year old SoulEV 30 kWh with 31,000 miles. The GOM shows 114 miles, and it covers 85 speedo miles with 26% charge left. If the 26% is correct, that suggests the range is 100/74*85=114.87 miles. The long-term "economy" display shows 4.0miles/kWh, which suggests the battery capacity is 85/4*100/74=28.72 kWh i.e. the SOH is 95.7%.
I appreciate there's a number of assumptions above, so I used Torque Pro and SoulEV Pro to get some confirmation. However.
The values for Max Det and Min Det appear absurd. SoulEVSpy gives the same values, but reports SOH as indeterminate. The cell voltages are all 4.12V except three adjacent cells which are 4.10. That is after a charge to 100%.
Any insight gratefully received.