I bought an AppleWatch Series 6 in 2020 for almost ¥60,000. Find my Device makes it chime, the battery will recharge but the screen is black, it doesn’t respond to Force booting and it’s effectively dead.
It was fun to have but a repair estimate of ¥45,000 is absurd so I have reverted to a Citizen analogue watch which has been in a draw for 4 years. ¥2000 for a replacement battery kick started it again. Still going strong after 32 years.