First let me say sorry for my bad English 😊 and thanks for all the answers.
I have an Samsung S7. I tried the facebook from the browser, but it didn't run so good, and had problem with the notification.
It feel like the facebook and messenger app is using to much battery. I heard that I can get a modded Facebook app without the messenger, that don't use so much battery as the original app, but I cant find it.