Old thread, but I thought I'd pop in here and give some info on these cars since they're kind of uncharted territory as far as high mileage goes.
I just bought a 2018 Clarity with 90k miles on it for $15,000. I noticed that it wouldn't take a charge when I was at the dealership but I'm new to PHEV/EV/hybrids and figured it was because the dealer wasn't using a Honda charger.
Long story short, the car wouldn't take a charge at all and needed about $8k in repairs. Tech said it needed a new charger control module and it was buried deep behind the dash. The part itself was $4,600.
During research online, I actually found the PO and he had the exact same experience. He was the original owner and put 90k on the car and traded it when the dealer he took it to (a different dealer, btw) also said it would be $8k to fix.
The dealership took the car back, thankfully. But this experience has made me very leery to try PHEV/EV/hybrids again. If that module and the battery needed to be replaced (or some other random and expensive repair), the car would be totaled. Which is a shame because it was a super clean car and a wonderful car, at that.
Sorry to be a bummer, guys, but this is my story.