is the best thing you can do to save battery is to leave in the watch app on your phone that Apple has on by default. i’m just afraid I’m using a lot of battery because I’m in cashier at a grocery store and I’m Moving my wrist alot. what are the settings you guys have on/off
I believe you’re referring to the “Always On Display (AOD) feature, which is only available on Series 5 models. My Watch is a Series 3, so I can’t speak personally about whether or not this feature drains the Watch’s battery. However, it seems that some people have reported that it does. Some folks opt out of this feature. If you want to earn how to turn the AOD on or off, check out this article from Apple Support: https://support.apple.com/guide/watch/turn-on-and-wake-apple-watch-apd748b87e2a/watchos
That will not help at all, but having your iPhone close to your watch (i.e., in your pocket, definitely within a few feet) will help a great deal. The further away they are, the more power the watch has to provide to the BT radio to sync data (or to use WiFi or cellular to connect to network services, which take even more power.)
That is Apple's design intention, yes. The watch is meant to be fully charged overnight and lasting 18 hours until you go to sleep again.
That doesn't mean you have to do it that way, but Apple designed the watch to give adequate battery life to monitor your activity and provide access to apps and notifications while you are awake and charge while you are asleep.
That’s completely normal! There are always functions running in the background. I can’t say specifically which ones but this happens. I really think that your watch is fine and you need to stop worrying about it and just enjoy it.