Our usage case was similar to yours.
I witnessed the same level of degradation on both models of the ZS EV over the 5 years we owned both cars.
No marked degradation until the car reached around 18 - 24 months old, then one morning after charging overnight, the predicted range at 80% SOC suddenly dropped and lower figure became the norm then.
Degradation had clearly started, but when the car went in for its annual services, I asked for a battery health check report.
Yes - It confirmed my thoughts.
Expect there to be another drop next year, if it follows the same pattern that both of our cars did.
It is less of a concern on the later LR model of course, because the pack is much larger than the one in the original ZS EV.
Honestly, I am fully expecting our new S5 to follow down the same path, as they share the same chemistry NMC packs.
Oh - Just for the record, we never charged on a rapid charger and the majority of the time we only charged to 80% SOC from our home wall box ( Given your low milage, probably the same as yourself ).
When choosing an EV it’s important that you include some battery degradation losses into your mileage / charging schedule requirements, especially if you intend to keep the car for a while.
If the car is on a lease or PCP deal, then it’s very likely you will not be worried about any degradation issues tbh.
Regular use of rapid chargers will give you no concerns either.
Some EV’s tend to report lower battery degradation figure over a longer period of time.
This maybe down to the quality of the pack or a larger buffer at the top of the battery, hiding the degradation
.
