My 42mm SS has never had even close to a full discharge. It usually discharges at about a 24 - 36 hour pace. In other words, that's its pace for losing juice. When I go to bed after having it off the charger for 18 hours or so, it usually has 50 to 40% left. Well, today, after just 10 hours it's down to 42%. I haven't really changed how I use it or my interaction with it other than one thing. I've been home all day and my phone has been upstairs. We are in a pretty big house (5K or so), so it I'm sure it's been searching between bluetooth and wifi all day. Most of the time, it's probably been on WIFI. Has anyone else noticed a change in battery use when in this situation vs. having your phone nearby all day?