Battery drain ? >Open Device Care > Battery > You'll see a list of apps that have been consuming power, if you notice a particular app that is draining battery more than normal uninstall it.
most note 9 users also have same issue. My note 9 was draining fast for the about 10 days after purchase. Now it has stopped on it's own (don't know how or why) and I get about 5 hours SOT. I guess it's android issue.
