Maybe, but I have no idea how they are rating the 18 hours - way different from other manufacturers. that's for sure. I easily get 2 days on my series 3 with only 83% battery health and I wear it 24/7 to monitor heart rate (health issue). so if 2 full days on an older watch = 18 hours, then what exactly are they trying to measure. It seems they just open themselves up to the torrent of whiners and complainers that are sure to follow.
How are you able to see the battery health of an Apple Watch?
edit: wow didn't know this was a feature in watchOS 7, in Settings > Battery