Venu 2 will go from 18% straight to ZERO.

I have had my Venu 2 since June 2021.  I am having a problem with the battery not holding a charge as long as it used to.  It will go from 18% straight to ZERO, it will vibrate asking me if I want to enable the battery saver, I tap X then immediately begin charging it. The display does show 0% but it will eventually charge to 100% but it takes a LOT longer than it used to.  What are my options? The closest Garmin Facility is 3 states away.