Galaxy S24 Ultra Owner Reports Heavy Battery Drain After One UI 9

A Galaxy S24 Ultra user says the phone is draining its battery far faster since moving to One UI 9, according to Sammy Fans. The report rests on a single screenshot shared on X, showing 95% of the battery used in 5 hours and 20 minutes, with 3 hours and 15 minutes of screen-on time. The S24 series has been receiving the update in waves, including the stable One UI 9 rollout in the US that began on October 12, but the report doesn’t say which firmware or region the affected phone is on. Samsung hasn’t acknowledged a wider problem.

The usage in the screenshot is heavy. Running QHD all the time on mobile data with video and social apps is one of the harder workloads for a phone, and the figures work out to roughly 3.4 hours of screen-on time from a full charge. Sammy Fans says the S24 Ultra normally manages 6 to 8 hours of screen-on time in daily use, but it doesn’t source that number, so it’s a rough guide at best. A single screenshot also can’t separate a software problem from normal battery wear on a two-year-old phone, and the report doesn’t mention the phone’s battery health.

Samsung India’s advice to visit a service center suggests the case was handled individually rather than as a known One UI 9 bug, though Samsung hasn’t said that. Sammy Fans itself notes there is no widespread outrage over One UI 9 battery life so far, and we didn’t find other reports of the same drain on the S24 Ultra. Phones often run extra background work for days after a major update, and Sammy Fans says an OS upgrade can take around two weeks to settle down, with outdated apps using more power in the meantime.

If your own S24 Ultra is draining quickly, the suggested steps are to update your apps, check the battery diagnostics in Samsung Members, clear the system cache partition, restrict background usage for apps you rarely open, try the Light performance profile, and turn on battery protection. Sammy Fans calls recalibrating the battery and a factory reset unproven, so it’s worth waiting a few more days before trying either. One UI 9 has had other early problems on Samsung phones, such as the Good Lock ClockFace bug on the Galaxy S26 Ultra, but Samsung hasn’t linked any of them to battery life.

M Adnan Akram

M Adnan Akram is the founder and lead writer at Phoonomo, covering mobile technology with a primary focus on Apple and the broader smartphone industry, alongside emerging developments in AI. He follows product launches, spec leaks, and industry trends closely to keep readers informed with timely updates.