I'm on iOS 9.1 and watch os2.0, I got this watch on Sunday, used. My battery life had not yet been over 15% when I get home after a day's work. My stand by is 12 hr 32 min and usage 3 hr 37 min. I've unpaired watch one day, cold booted another day, set up as new watch again, and turned off diagnostics as I saw recommended in another thread for battery conservation. Anything I missed to try to improve that or is it normal?