It seems one of the main reasons for the drop in value of EV's, is becasue it was tree or four years ago that large fleet and lease operators started to buy EV's. Those leases are now coming to an end and so there are many used but in good condition EV's now on the secondhand market.
The larger operators have reported that the reliability of the EV's batteries have been very good, but as many of the models were new models, there have been other fault issues which has affected the overall reliability of EV's has not been as good as many pundits including my self had hoped. But the issues have not generally been related to the the motive battery or the motors which have actually been more reliable than anticipated, its been the other systems related to teething problems as typical with many new model introductions. This has resulted in many repairs taking longer whilst parts and or knowledge were slowly obtained.
The flood of SH EV's and some new cars from mainly Chinese manufactures at significantly lower prices has attracted buyers and reduced new car sales from traditional manufacturers, who have responded by reducing new car prices.
At last there are some real EV choices for new and secondhand buyers.