Samsung Electronics GmbH
Hello,
The battery life of the Samsung Galaxy Watch3 naturally depends on how intensively it is used and which functions are activated. For example, are Bluetooth and WLAN constantly switched on? How is the pulse measurement set? Which watch face is installed? Do you use it a lot for making phone calls, checking notifications, workout tracking and listening to music? The display brightness is another factor that must be taken into account. If you have paired the smartwatch with a smartphone, it is worth taking a look at the Galaxy Wearable app. There you can see which functions and settings drain the battery the most.
Best regards from Schwalbach,
Your Samsung Service Team

I have to recharge my Watch3 every day after I do about 1 hour of sport. However, for me the "watch is always on". It may well be possible to optimise the runtime...

The runtime is 3 to 4 days. Depends on the frequency of the functions performed.