Reports from Galaxy S24 users claim their phones are experiencing severe battery drain issues after updating to One UI 9. One device under "heavy use" reportedly dropped 95% in a little over five hours; however, it appears quite excessive in nature. Another report from a Galaxy S25 user states their device dropped a whopping 40% while sitting idle. A recent report from a Korean Galaxy S26 user states their device locked up after downloading One UI 9 due a "webpage unavailable bug." Samsung has had a busy month. One UI 9 is rolling out on its current-gen and past-gen phones, but it's the latter that's worse off. A Galaxy S24 Ultra user has reportedly experienced severe battery drain since downloading Samsung's One UI 9 update (via Sammy Fans). The phone's battery reportedly consumed 95% of its charge in five hours and twenty minutes. The post states this was after "heavy use." However, this might seem a bit excessive. The Galaxy S24 Ultra in question only reported a little over three hours of "screen-on time" (So T).
It's unclear how widespread the problem is. Some users haven't noticed vastly different battery experiences since downloading One UI 9, while others have. A 9to5Google highlighted a Reddit thread discussing whether or not the Galaxy S24 is suffering from extreme battery drain. Curiously, one user reports horrendous idle battery drain with their phone. One user had only two and a half hours of So T, and their battery dropped significantly. In almost 11 hours, their battery lost 40% of its charge while sitting idle. More users continued to share their "since last charge" data. Users with higher So T showed understandable battery drain. The folks at 9to5 noticed some reports concerning the Galaxy S25 series. A user said they've had to start charging their phone multiple times a day to get through. We've not noticed any significant changes in our Galaxy S25 Ultra, so this could be one of those weird case-by-case situations. Bumps in the road
Android Central's Take I hate tech problems. I'll always hate tech problems. But nothing's more frustrating than when you're struggling from something, but many others aren't. At that point, where do you find your answers? These battery drain issues have been gaining traction. I've seen reports on Samsung's community forums, and of course, there's Reddit, too. If something is amiss, hopefully Samsung sees it and can help those affected. The situation only gets weirder when you factor in the strange setup bug that one Korean user encountered with One UI 9. The user states they're unable to get to the lock and home screens after updating to Android 17. They are consistently given an error on the final step, but Samsung responded quickly. To fix the "webpage is unavailable" error, Samsung said to ensure the browser is updated. What's more, it recommends switching to a stable Wi-Fi connection. This is another that's not widespread. However, Samsung might roll out a fix for this to cover its bases and make sure more users aren't affected. The only question is when that might happen. Get the latest news from Android Central, your trusted companion in the world of Android Nickolas is always excited about tech and getting his hands on it. Writing for him can vary from delivering the latest tech story to scribbling in his journal. When Nickolas isn't hitting a story, he's often grinding away at a game or chilling with a book in his hand.
Source: Android Central · Summarized by HeadlinesBriefing