Some Galaxy S24 and S25 owners say their phones are losing battery much faster since the One UI 9 update, according to posts that Android Authority and 9to5Google collected this week. Samsung has not commented publicly on the One UI 9 battery drain reports.
If you installed the Android 17 update and your charger suddenly feels like part of your day, you are not imagining a pattern, but you are also not looking at a confirmed bug. The reports are real posts. What nobody has shown yet is how many phones are affected.
TL;DR: Galaxy S24 and S25 owners are posting about faster battery drain after One UI 9, including one S24 Ultra that lost 95 percent in about five hours. Outlets say the reports are not widespread, and Samsung has not given a public explanation. A restart is the cheapest first step. Hold off on a factory reset until you have backed up.
What One UI 9 battery drain owners are reporting
The numbers come from individual owners, not from testing, and the posts differ in how heavily the phone was used. That matters, because heavy use and idle drain point to different suspects.
| Who posted | What they reported | Reported by |
|---|---|---|
| Galaxy S24 Ultra owner on X | 95 percent lost in about 5 hours, with a little over 3 hours of screen time | Android Authority |
| Reddit user in r/GalaxyS24 | About 40 percent lost in nearly 11 hours, with about 2.5 hours of screen time | Android Central |
| Galaxy S25 owner on Samsung Community | Needs to “charge my phone 3 to 4 times a day” | 9to5Google |
I could not open the Samsung Community thread or the Reddit posts myself, so these figures are as the outlets relay them.
How widespread is the problem?
Nobody outside Samsung can say. 9to5Google calls the reports not widespread, and Android Central notes that some users see no change at all. It says it has not seen significant changes on its own Galaxy S25 Ultra.
That split is typical after a big update, and S25 phones have had the software since early October, per our Galaxy S25 Verizon rollout report. A phone that runs fine for one owner can drain for another because of one app or one setting, and a forum thread only collects the people who are annoyed.
A separate setup bug is hitting other Galaxy phones
Do not mix this up with a different problem. Phandroid reports that some owners were stuck on the setup screen with an “Access Denied” error, and that some Galaxy S26 Ultra phones froze during fresh setups.
The Phandroid report says Samsung acknowledged the S26 Ultra freezing on a South Korean forum and linked it to a web browsing component. It also says Samsung began offering an S26 update under 600 MB on Monday, with notes that mention only general stability. Samsung has not tied that update to the battery complaints.
What Samsung has and has not said
On battery drain, Samsung has said nothing publicly. Android Authority reports that Samsung contacted the S24 Ultra owner on X to arrange a service appointment at a nearby store, and says it has written to Samsung for clarification without a reply yet.
That is a customer service step, not a diagnosis. Whether this is a software bug that needs a patch or a handful of unlucky phones is still open.
What to try before you blame the update
Android Authority and 9to5Google both list a restart as the first step, then a factory reset if the drain continues. Treat the reset as a last resort and back up photos and app data first, because it wipes the phone.
Before that, open your battery usage list and see whether one app sits far above the rest, since a single misbehaving app can look like a bad update. To see what the update changed in the first place, our One UI 9 feature breakdown helps. My read is that the idle drain reports are the ones worth watching, because a phone sitting in a pocket is harder to blame on how you use it.
