My 2018 Clarity (~159,000 km...1,000kms away from the battery warranty expiry) just popped up a CEL and POWER SYSTEM warning on through dash. Connected to OBDII and codes P1DC7 and P0A7F came up (Hybrid battery pack - deterioration). Brought it to the dealership and 2 days later, they said they cleared the codes and come back if the error reappear. They stated that's Honda SOP.
The weird part is the battery range is much higher and battery capacity jumped from 42Ah, measured a few weeks ago, to 55Ah. Thanks to your post, I'm waiting for this to stabilize.