My personal experience I take my watch off charger at 7:30am and it goes back on at around 10pm. I run an auto tint, audio, and detail shop so I don't sit at all throughout the day im on the move all day making sure everything is running smooth so my watch is constantly turning on. So at the end of the day when it goes back on charger its still around 60%. Running ios2 and ios 9.0.2