Fenix 6 Pro Won't Turn On Unless Plugged In

I used my watch two days ago to track a hike and it worked fine. I went to use it today for a bike ride and it wouldn't turn on. When I plugged it in to the wall it turned on but it said it had 100% battery which I know not to be true. And the second I unplug it it turns off and it won't power on again. Does anyone have any information on this? Thanks in advance.