Samsung GearS3 Frontier battery consumption

[Android Central Question]

Hi,
I have a question about the battery consumption of my Gear S3 watch. I bought a used watch few weeks ago and have worn it since then. Have no complaints whatsoever about the functionality but I do have one issue with battery consumption . In the standard mode the battery would last (the usual) 2-3 days without charging but when using the sports apps (Samsung health or MapMyRun) it uses up to 80% of capacity during a 50mins/10km run. Is there an issue with my watch (can be related to intermittent GPS tracking/pairing with the phone) or is it the battery?
Thanks for any feedback.

 

[belodion]

Moved to Gear S3 for comments from users.

 

[bbgpsuser]

I use Endomondo on my Gear S3 to monitor and track my runs. A one hour run typically uses about 12% of the battery.