Just for Leafs and some of the short range compliance cars like Golfs that don't have active thermal management of the battery. The old SparkEV batteries are following the expected curve mostly: about 10% loss in the 8yr warranty period, followed by relative plateau of slow degradation mitigated somewhat by its overprovisioning. Hyundai and Kia etc. batteries should be fine, for example.
Telemetry is just as much a problem though.