Battery draining crazy fast on my new phone, any tips?

I just got a new phone last week, and the battery seems to be draining way faster than I expected. I thought new phones usually have great battery life out of the box, but mine barely lasts half a day with normal use. I've tried turning off some background apps and lowering screen brightness, but it doesn't seem to help much. Has anyone else experienced this with a new device? Is this just a break-in period thing, or should I be worried about a faulty battery? Would love to hear any tricks or settings tweaks that helped you squeeze more juice out of your phone. Also, any apps to monitor or manage battery usage better? Thanks!