No issues with functionality. I have tried the heart rate monitor in a while, so likely needs a new battery to work properly (I think it’s a cr 2032).
The watch battery life if fine but not extraordinary. It is an older model watch and not the dames a top of the line watches. However you can certainly track several activities on one charge (depending on length obviously).
If you are interested let me know … I might not be able to ship the watch till ~July 1819.