9 series watch notification

I realized my 9-series watch is no longer charging to 100% after it has been on the charger for about an hour. I almost always only leave it on for 45 minutes to an hour once it drops down to about 40%. There was a notification it would no longer charge to 100% to preserve battery life as of a day ago. I have not had the watch for a year yet, and I'm pretty consistent about how long I leave it on the charger. Can I turn that off? Should I be concerned that the battery is already drained? Any insights would be greatly appreciated.

Thank you.