Some Galaxy S24 and S25 owners say Samsung’s One UI 9 update is causing worse battery life after installing it. Multiple outlets report that the issue shows up as unexpected battery drain rather than normal, gradual changes, with affected users describing noticeably reduced performance compared with before the upgrade.
Android Authority cites user reports of steep, rapid drops, including an example of battery falling by a large amount after a relatively short period of screen time. Android Central and 9to5Google similarly frame the situation as a problem emerging after the update, with 9to5Google specifically tying the timing to Samsung’s latest Android 17-based One UI 9 release. Across sources, the shared focus is on user experiences rather than confirmation of a single technical cause.
