Samsung One UI 9 Update Reportedly Causes Battery Drain on Galaxy S24 and S25

Samsung Galaxy users are reporting potential battery drain problems following the rollout of One UI 9. Reports from some Galaxy S24 and Galaxy S25 owners describe unusually high power consumption, including battery loss during periods when their phones were barely being used.

Although these complaints have attracted attention online, it remains unclear how widespread the issue is. Some users say their battery performance has remained normal, suggesting the experience may vary by device and usage conditions.

Galaxy S24 Ultra Users Report Excessive Battery Drain

One Galaxy S24 Ultra owner reportedly experienced a substantial drop in battery life after installing Samsung's One UI 9 update, according to a report from SammyFans.

The user claimed that the phone consumed approximately 95% of its battery over five hours and 20 minutes of use. However, the reported screen-on time was slightly more than three hours, and the device was described as being under heavy use.

That distinction matters because battery consumption depends on several factors, including screen brightness, gaming, mobile data, background applications, and signal strength. The reported figures alone do not establish whether the update caused abnormal battery drain.

Other Galaxy S24 users have also discussed their battery experiences on Reddit. While some report disappointing performance after updating, others have not noticed a major difference.

For now, these reports point to a possible issue affecting certain devices rather than a confirmed problem with every Galaxy S24 phone running One UI 9.

Galaxy S24 and S25 Owners Report Battery Drain During Idle Time

Some of the more concerning reports involve battery consumption while phones are not actively being used.

One Galaxy S24 user reportedly said their device lost around 40% of its charge over nearly 11 hours while sitting idle. The same report indicated approximately two and a half hours of screen-on time during the broader usage period.

Galaxy S25 owners have also shared complaints. One user reportedly said they needed to recharge their phone multiple times a day to get through normal use.

However, individual experiences differ, and not every Galaxy S25 owner has observed unusual battery consumption following the update.

Possible contributing factors include background applications, software optimization after installation, connectivity problems, and settings that allow apps to operate when the screen is off. More information would be needed to determine whether One UI 9 itself is responsible.

Galaxy S26 User Encounters a Setup Error After One UI 9

Battery drain is not the only reported concern associated with the update. A Galaxy S26 user in South Korea reportedly encountered a setup problem after installing One UI 9 alongside Android 17.

According to the report, the device became stuck during the final setup stage and displayed a “webpage unavailable” error, preventing the user from reaching the lock screen and home screen normally.

Samsung reportedly advised the user to ensure the browser was updated and to connect to a stable Wi-Fi network.

This issue appears to be a separate problem from the battery complaints, and there is not enough evidence to conclude that either issue affects a large number of devices.

Nevertheless, setup errors can be particularly frustrating because they may prevent users from accessing their phones after an update. The reported troubleshooting advice suggests that browser components or network connectivity could be relevant to this particular error.

How to Reduce Battery Drain After Installing One UI 9

If your Samsung Galaxy phone is losing battery unusually quickly after an update, try these troubleshooting steps before assuming that the update has permanently damaged battery performance.

1. Check battery usage

Open Settings and navigate to Battery to identify which apps and services are consuming the most power. Look for applications with unexpectedly high background usage.

2. Restart your phone

A restart can help resolve temporary software issues that sometimes occur after installing an update.

3. Update your applications

Open the Google Play Store and Galaxy Store to check for app updates. Also install any available Samsung software updates that address known problems.

4. Review background activity

Restrict unnecessary background activity for applications that consume excessive power. Samsung's battery and background-usage settings may vary slightly depending on your model and software version.

5. Check connectivity

Weak cellular reception can increase power consumption. If battery drain is particularly noticeable in areas with poor coverage, compare performance under a stronger signal or a stable Wi-Fi connection.

6. Give the phone time to optimize

Battery performance can fluctuate temporarily after a major software update while the phone completes background processing. Monitor usage over the following days to see whether performance stabilizes.

If the battery continues draining unusually quickly, consider contacting Samsung Support and sharing your battery-usage information.

Will Samsung Release a Fix for One UI 9 Battery Problems?

At present, the user reports described here do not establish that Samsung has confirmed a widespread One UI 9 battery defect or announced a dedicated fix for it.

If further reports identify a common software problem, Samsung could investigate and potentially address it through a future update. However, users should wait for an official announcement rather than assume a patch is guaranteed.

Galaxy S24, S25, and S26 owners should also distinguish between individual battery complaints and the separate setup error. Different causes may require different solutions.

For affected users, the most useful next step is to document battery usage, check for application or system updates, and report persistent problems to Samsung. Additional evidence will help establish whether these are isolated incidents or signs of a broader software issue.