Welcome to the forums, Mrbez!
You'll start to learn where your battery life takes a big hit and it's most definitely that (humongous, gorgeous) screen.
Trying to set it as low in brightness as bearable really helps. Also, disabling a lot of Samsung built in settings like eye tracking and what not can help.
If you can kill the entire battery and post a screenshot of your usage, we can give you a bunch more help!