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Some Galaxy S24 owners say their phones are losing battery unusually quickly after installing One UI 9. Reports include a Galaxy S24 Ultra losing 95% over five hours and 20 minutes during reported heavy use, plus a separate account of substantial idle drain. The scale and cause are unknown, and Samsung has not announced a broad battery fix.

Some Galaxy S24 owners say their phones are draining battery unusually quickly after installing One UI 9, including one Galaxy S24 Ultra report of a 95% charge loss over five hours and 20 minutes. The accounts point to a possible update-related problem, but user reports are mixed and do not establish that the issue is widespread or confirm its cause.

The Galaxy S24 Ultra example, reported through SammyFans, involved what its owner described as heavy use. The phone recorded a little more than three hours of screen-on time during the period in which it lost most of its charge. That figure makes the report difficult to interpret on its own: it documents a user’s experience, not a controlled battery test or proof that One UI 9 caused the drain.

Other accounts described different patterns. In a Reddit discussion about Galaxy S24 battery life highlighted by 9to5Google, one user said their phone lost 40% over almost 11 hours while idle, with about two and a half hours of screen-on time. Other people shared their battery use since charging, and accounts with more screen-on time showed losses that were described as understandable. Some Galaxy S24 owners said they had not noticed a major change after updating.

Reports also mention battery trouble on the Galaxy S25 series, including one user who said they needed to charge their phone several times a day. That is a separate user report, not evidence that all newer Galaxy phones are affected. Android Central said it had not seen significant battery changes on its Galaxy S25 Ultra, underlining that experiences vary.

Battery Reports Are Mixed

Battery drain can make a phone harder to rely on throughout the day, particularly if it continues during idle periods or forces owners to recharge more often. For affected Galaxy S24 users, the reports offer a reason to compare their own battery use after updating, but they do not show that every device running One UI 9 has a defect.

The distinction matters because battery consumption depends on more than software version. The reported figures come from individual devices, with different usage patterns and no shared testing method. A rapid drop may be a sign of a real problem for a particular owner, but the available accounts cannot identify whether the cause is the update, an app, network conditions, device settings or another factor. Treating scattered reports as a confirmed series-wide failure would go beyond what is known.

If Samsung identifies a recurring software issue, an official response or update could affect many owners. For now, the reports are a signal to watch rather than confirmation of a broad fault. Users considering whether to install the update should also distinguish anecdotal accounts from a company statement or a repeatable test.

Reports Follow the One UI 9 Rollout

Samsung has been rolling out One UI 9 to current and older Galaxy phones. The battery complaints described here concern individual user experiences after updating; the available accounts do not provide a confirmed timeline linking a specific release build to a particular battery behavior across devices.

A separate report from a Galaxy S26 owner in Korea described the phone locking up during setup after the update, with a “webpage unavailable” error on the final step. Samsung reportedly advised the user to update the browser and connect to stable Wi-Fi. That setup problem is distinct from the Galaxy S24 battery reports, and the account does not establish that the two have a shared cause.

In the setup case, Samsung offered troubleshooting guidance, but the reported response is not a public acknowledgement of a widespread issue. The available information likewise contains no broad Samsung confirmation of a One UI 9 battery defect.

“The setup error was described as “webpage unavailable.””

— A Galaxy S26 owner in Korea, as described in the report

Cause and Reach Remain Unknown

It is not yet clear how many Galaxy S24 phones are experiencing unusual drain, or whether the reports share a single cause. The accounts provide no controlled before-and-after testing, common device configuration or confirmed software-build details that would tie the battery losses directly to One UI 9.

It is also unclear whether the reported idle drain persisted, whether owners found a workaround, or whether Samsung has received enough reports to investigate a broader pattern. Some users report little or no change, while others describe substantial losses. The evidence available so far supports describing these as user-reported problems, not a confirmed defect affecting all Galaxy S24 devices.

Watch for Samsung Guidance

The next useful development would be a Samsung statement identifying whether it is investigating the battery reports, or a software update that specifically addresses them. No timing for a battery fix is established in the available information. Owners reporting problems can record their battery use, screen-on time and software version, and consult Samsung support; those steps may help describe an individual case but do not confirm the cause.

Until more evidence or official guidance appears, Galaxy S24 users should treat the reports as a developing issue with an uncertain scope. The separate browser and Wi-Fi advice concerned the reported Galaxy S26 setup error and should not be presented as a confirmed remedy for battery drain.

Source: Android Central

Key Questions

Are all Galaxy S24 phones affected by One UI 9 battery drain?

No. Some owners have reported unusual drain, while others say their battery experience has not changed much. The reports do not establish how widespread the issue is.

What battery loss did Galaxy S24 users report?

One Galaxy S24 Ultra owner reportedly lost 95% of a charge in five hours and 20 minutes during what they called heavy use, with a little over three hours of screen-on time. Another user reported a 40% loss over almost 11 hours while the phone was idle, alongside about two and a half hours of screen-on time.

Has Samsung confirmed a One UI 9 battery problem?

The available reports do not include a Samsung confirmation of a widespread battery defect or a promised fix. The reports remain individual user accounts.

Is the Galaxy S26 setup error related to the battery reports?

No connection has been established. The Galaxy S26 account involved a “webpage unavailable” error during setup, and Samsung reportedly recommended updating the browser and using stable Wi-Fi. That is separate from the Galaxy S24 battery complaints.

Source: Android Central