This is not a question but a set of tips to extend your battery life:
1- avoid watch faces with any dynamic data, especially the ones that update the screen every second. Features that usually don't use much power: connectivity, battery life, date and time with no seconds;
2- disable backlight by gesture on both during activity and no-activity (options -> system -> backlight);
3- set backlight timeout to the minimal value for both during activity and no-activity (options -> system -> backlight);
4- disable software auto-update (options -> system -> software update);
5- disable activity tracking. Notice that this will prevent some data to be acquired, like steps, sleeping, body battery, stress, calories (options -> activity tracking -> status off);
6- disable move alert (options -> activity tracking);
7- disable goal alert (options -> activity tracking);
8- disable move IQ (options -> activity tracking);
9- disable phone notifications (options -> phone -> notifications -> status off);
10- disable all alerts and key tones for everything;
11- disable Bluetooth when not uploading an activity, which means you won't be able to control music (options -> phone -> status off);
12- disable GLONASS and Galileo (after selecting an activity, scroll down to GPS settings and select GPS only);
13- disable heart monitor broadcast during activity (options -> wrist heart hate);
