Battery life for each of our Smart Battery Modes will vary based on multiple factors, from how often the watch is woken up and interacted with and how many apps or tiles are launched or running in the background to whether the watch is set up to take calls using the watch speaker and microphone. Performance even varies greatly depending on which watch face is used as well as which complications are used within a watch face. It’s worth noting that during the first few days of use, there are various updates going on in the background and users generally use the watches significantly more to play with different watch faces, Tiles and apps. After the first few days, more average use settles in and battery life becomes more consistent.