Samsung releases a new security update for its phones every month. While most rollouts are completed without a hitch, it's not uncommon for these updates to introduce a bug that needs to be fixed with a subsequent update.
Though it went largely unnoticed, quite a lot of users experienced elevated battery brain on the Galaxy S23 after installing the August update last month. Similar reports also came in from Galaxy S22 owners. The September update is now rolling out and one hopes that this issue has been fixed.
September update should fix the battery drain issue
Galaxy S22 owners were the first to report higher battery drain after installing the August update. Samsung's official forums then filled with reports from Galaxy S23 users as well who also felt that the battery was draining way faster than usual after the update was installed.
The problem wasn't officially addressed by Samsung so it's unclear what may have caused this or how widespread the problem ended up being. There were considerable reports both on the forums and other online networks, so it's possible that quite a few people were impacted by this issue.
Samsung has been rolling out the September security update for the Galaxy S22 and Galaxy S23 series for some days now. If you experienced this issue after last month's update, go ahead and install the latest security patch. It's quite likely that the update would have addressed the issue.
If you still feel that the battery drain is elevated, go ahead and raise the matter on Samsung's official forums. Enough complaints would probably get a response from the company.