Why Is My Samsung S9 Battery Draining So Fast. You can also closely monitor how much battery different apps are using. The culprit could be the battery itself.

If the battery life of your Galaxy S7 and S7 edge are usually great but has tanked in the last few days try restarting the phone. Trying a factory reset now. Lithium-ion batteries like the ones youll find in a Samsung Galaxy S or Note series phone can degrade over time with expected life spans of just 2 to 3 years.
Users can even consider using the auto-brightness option.
Turn down the screen brightness. Android platform is loaded with a lot of apps. How To Fix Samsung Galaxy S8 Battery Life Issues in Galaxy S 10-07-2019. You can also closely monitor how much battery different apps are using.
