1) I use the watch daily as a fitness tracker for integration with Google Fit and G Pay contactless payments. They are discharged per day by less than half, somewhere by 40-45%, i. E. the charge lasts stably for two days, with NFC, Wi-Fi, Bluetooth constantly on.
Attention! The package comes pre-installed with Cardio and Adidas Runtastic applications, which constantly slow down, transmit your coordinates and eat up the battery. Now, when Google Fit and Wellness (a special heart monitor for Fossil Gen 5) in total can actually do everything, third-party applications are simply not needed and should be removed right away, even before the first Wear OS ate (with each new ate, Google optimizes something and the clock is eating less and less battery).
2) After removing all the Bloatware and leaving a clean Wear OS, the watch just flies. The delay time of the interface for pressing is almost impossible to notice (much less than 0.5 s).
3) The watch is great at detecting your workouts automatically, but in order to get smoother graphs, you should not be lazy and start/stop workouts manually every time. In this case, the clock polls the sensors an order of magnitude more often and the results are more accurate, while this does not visually affect the battery charge.
4) I take my watch off my wrist once a day when I go to the shower. They charge instantly, so when you exit the shower, they are always already 100% charged. Once, while I was putting them on, I was distracted, they slipped out of my hand and fell straight flat on the glass of the dial with such a sound as if I had dropped a weight. For a moment I thought that perhaps they were finished, but when I picked them up and carefully examined them from all sides, I did not even find a single micro scratch. I don’t know if this glass is so strong or I was just lucky, but I don’t plan to repeat this experience on purpose in order to gain statistics.