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At 13,605 miles, the battery capacity for my 2016 Spark EV was 16.5 kWh.  Today, at 19,031 miles, my battery capacity is 15.5 kWh as measured using TorquePro.  But..... in early April 2019 I started limiting my L1 and L2 charging on my 2014 and 2016 Spark EVs to 80-85%.  For the last 1000 miles on each car, there has been no change in the measured battery capacity.  I will have to collect data for the next 6 months or so to see if this change in charging significantly reduces my battery degradation rate. Prior to starting this test, the battery degradation rate for both cars was about 0.25 kWh per 1000 miles.