AppleWatch battery draining rapidly

Hello, as of the last few days my apple watch battery has been draining like crazy. I used to get through a full day, including using it for a 45-60 minute workout, and it would still have 35-40% battery by the time I went to bed.

Now, its draining battery so quickly I get to 50% before half the day is over without even using the watch actively. Then by the end of the day it's completely dead. It's also taking longer to charge.

What's going on and how do I fix it?

My background app refresh is off and i haven't put any new apps on it recently.