Samsung galaxy s6 battery draining ultra quick don't even manage to get a complete days use from the battery
Does your phones battery settings indicate what's using your battery ?
You could put the phone in safe mode which disables all your downloaded apps and leaves the stock ones alone which can then help to highlight if it's a rogue app causing this.
As phones are all set up differently from settings , apps and app permissions etc it's not an easy process to highlight a particular issue.
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.The advice I offer is my own and does not represent Samsung’s position. I'm here to help. " This is the way. "