S62 Battery life

Hi. I just had my S62 for about 3 weeks. The first week I used it for two rounds of golf a walk lasting 2 hours battery only went down to 70%. However in the last few days, I’ve had to charge it every days as it went below 30% within 8 hours and that’s not using the GPS at all For golf or walking. The phone pairing had been switched off on the watch. Have I got a dud one.