My watch active 2 sometimes drains down really fast. It can go from 80% battery to 15% in 2 hours. Today the battery was on 70% when I woke, I did an hours workout and about an hour after my watch vibrated to tell me tgat tge battery was low and told me to switch to battery saving mode. I out it on the charger as tge battery was 11% and left it for an hour and a half and when I checked on it the battery was only on 33%. I hope that my watch isn't having battery issues after less than a year!