Garmin Venu SQ2 battery draining fast,and not switching on after 1 year and 1 month in use

My Garmin Venu SQ2, started showing fast drainig of battery, about 2 weeks or so ago. Now (today) it shows 100% on charge, but when taken off charge, it dies, not wanting to go on. I have resetted it, followed the trouble shooting on Garming battery usage tips, also contacted the Garmin Agent where I bought the watch, still no luck? what can be the issue? How can I reslove this without spending more money on this expensive tool, I cant seem to use now, after 13 months...?

Can Garmin and anyone else with similar issues kindly assist?