initially i set up music, but removed it after 2 days noticing my battery plummeted. i've gone through all settings and turned off all alerts except from phone. i've not used GPS in the last 3 days and i went from full charge to 23% in 54hours. i've done two runs on the treadmill have been the only activity since full charge. i'm super disappointed. i upgraded from my last one as it would last 7.5 hours in GPS mode and this is suppose to last 20+ hours. suggestions??