battery issue

In "Settings > Battery", you can check which apps might be responsible for increased battery consumption. If the battery drains quickly during active use, you could reduce the display brightness.

I can't tell from your description whether the increased battery consumption occurred suddenly or over a longer period of time.
If the problem occurred with an update, I would recommend that you contact Samsung about this issue.

Maybe this link will help you with further tips on this topic:
https://r2.community.samsung.com/t5/Galaxy-A/Battery-draining-issu/td-p/15000476