If your Galaxy phone has been draining its battery faster than usual lately, you’re not alone. And no, it may not simply be an aging battery.
Samsung recently released a new software update for several Galaxy models. Soon after, users began reporting similar problems across Reddit, Samsung Community forums, and social media. The complaints include shorter screen-on time, faster standby drain, and, in some cases, phones running noticeably warmer even while sitting idle.
Before going any further, there’s an important point to make: this article isn’t about jumping on a bandwagon or assuming the worst.
Software updates are complicated, and not every battery complaint posted online turns out to be widespread or directly related to an update. So we’re taking a closer look at what Samsung changed, what users are actually experiencing, and what the available testing and technical reports suggest.
By the end, you’ll have a clearer picture of whether this update is worth installing immediately—or whether it may be better to wait.
What’s Actually in This Update?
Official Changelog: What Samsung Says It Changed
Samsung released the update as its July 2026 security patch, which began rolling out on July 21 and is built on One UI 8.5.
As with most monthly security updates, Samsung’s official notes focus mainly on security fixes and general stability improvements. The changelog does not mention the battery or thermal problems users are now reporting.
At the time of writing, Samsung has also not publicly acknowledged these reports or confirmed whether a fix is being developed.
New Features vs. Under-the-Hood Changes
This wasn’t a feature-packed update.
There were no major new capabilities or redesigned interface elements. That’s part of what makes the situation frustrating for affected users: a routine security patch appears to have been followed by a potentially serious background performance problem.
Technical investigations into the issue point toward a stuck CPU wakelock. In simple terms, this can keep the processor active when the phone should normally be entering a low-power state.
That means the problem may not be caused by a new feature consuming extra power. Instead, something may be preventing the phone from properly going to sleep.
Troubleshooting is also more complicated because Samsung quietly removed the full cache partition wipe option from the recovery menu in its February 2026 security patch. Users are therefore left with more limited workarounds, such as clearing individual app caches or testing the phone in Safe Mode.
Which Devices Are Affected?
Reports are concentrated on:
- Galaxy S25 series, particularly the Galaxy S25 Ultra
- Galaxy S24 series, particularly the Galaxy S24 Ultra
The two Ultra models appear to be the most heavily affected, although reports suggest the issue isn’t necessarily limited to Ultra variants.
It’s important to remember that Samsung has not published an official list of affected devices. The full scope of the problem could therefore change as more users install the update and report their experiences.
Not every phone appears to be affected equally, either. Battery health, installed apps, network conditions, and the amount of time since the update was installed may all influence how severe the drain becomes.
The Battery Complaints: What Users Are Saying
Overview of User Reports
Complaints began appearing soon after the July 21 rollout and have followed a similar pattern across multiple platforms.
On Samsung Community forums, users have reported significant battery drain following the July 2026 update. One user described repeated alerts saying that the CPU was processing excessively and that the device needed to be restarted. Another user said they had started carrying a power bank just to make it through the day.
Similar reports have appeared on Reddit and in technology coverage of the issue.
While individual reports don’t prove that every affected phone has the same problem, the number and similarity of complaints suggest that this isn’t simply a collection of completely unrelated battery issues.
Common Patterns: How Much Drain, and Which Apps Are Involved?
Several patterns appear repeatedly in user reports:
- Faster drain despite lighter use: One Galaxy S25 Ultra owner reported significantly higher battery consumption despite spending less time actively using the screen than before the update. That suggests the problem may involve background activity rather than normal screen usage.
- WhatsApp as a possible trigger: In at least one investigated case, the battery drain was linked to WhatsApp becoming stuck during its backup process after the update.
- A stuck CPU wakelock: Technical investigations have pointed to a wakelock that keeps the processor active even when the phone is idle. Instead of entering a low-power state, the CPU may remain active for extended periods.
- Overheating alongside battery drain: Some users have reported both rapid battery depletion and unusual heat. That combination suggests the processor may be working harder than it should instead of simply experiencing reduced battery efficiency.
- Significant overnight depletion: Perhaps the most concerning pattern is battery loss while the phone is supposed to be sleeping. Some users report losing far more battery overnight than they did before the update.
Real-World Signs Users Are Reporting
Some of the strongest evidence comes from simple before-and-after experiences rather than benchmark charts.
Users have reported:
- Needing to charge their phones multiple times per day despite unchanged usage.
- Unusually high power consumption while the phone is idle or overnight.
- Increased heat when the device isn’t being actively used.
- A noticeable change in battery behavior immediately after installing the update.
Samsung Community moderators have also shared guidance encouraging users to power their devices off completely rather than leaving them on standby. Users have also been advised to avoid additional heat exposure, such as direct sunlight or placing the phone underneath pillows or blankets.
Still, it’s important to keep the situation in perspective. Not every device appears to be affected to the same degree. Battery health, apps, network conditions, and the time since installation may all influence the severity of the problem.
Is It Real? Testing the Battery Drain
Methodology
Before treating a wave of forum complaints as proof of a widespread software problem, there’s an important question to answer:
Is this actually a broad issue, or are a relatively small number of complaints being amplified online?
To evaluate the situation fairly, the available evidence comes from affected users, independent technology outlets, and Samsung Community reports. Samsung itself has not published internal diagnostic data confirming the issue.
A proper battery-drain investigation should look at several factors:
- Screen-on time vs. battery percentage lost: This helps determine whether the battery is being consumed during active use or in the background.
- Standby drain: This measures how much battery disappears while the phone is idle and not charging.
- Before-and-after comparisons: The most useful comparisons come from the same device and user immediately before and after the update.
- Thermal readings: Temperature measurements can help determine whether the processor is working harder than expected.
Before vs. After Results
The clearest evidence so far comes from user-reported before-and-after comparisons rather than formal laboratory benchmarks.
One Galaxy S25 Ultra owner documented substantially higher battery consumption despite spending less time actively using the phone after installing the update.
That’s an important detail because it makes heavier usage a less convincing explanation. If screen time decreases while battery consumption increases, background activity becomes a more likely suspect.
That observation also matches the technical explanation reported by outlets covering the issue: a stuck CPU wakelock may keep the processor active even when the phone is idle.
In practical terms, the difference is simple.
Before the update: The phone enters low-power states when it isn’t being used.
After the update: A background process may prevent the phone from fully resting.
That could explain why some users are experiencing both faster battery drain and increased heat.
The problem may be particularly noticeable overnight. A phone that previously lost only a small percentage of battery while sitting on a nightstand could lose substantially more if it fails to enter its normal sleep state.
Which Devices Were Hit Hardest?
Based on the volume and consistency of available reports, two models stand out:
- Galaxy S25 Ultra
- Galaxy S24 Ultra
Other Galaxy S24 and S25 variants have also been mentioned, but the Ultra models appear more frequently in documented complaints.
It’s still too early to say exactly why these models appear more heavily represented. The difference could be related to their user base, hardware configuration, or background processes associated with their additional features.
Again, this isn’t necessarily a universal problem. Battery health, installed apps, network conditions, and the time since installation can all affect the severity of battery drain.
Why This Might Be Happening
Possible Technical Causes
The most consistent technical explanation so far is a stuck CPU wakelock.
A wakelock is a signal that allows an app or system process to keep the processor awake when it needs to complete a task. Normally, the wakelock should be released once that task is finished.
The problem occurs when the wakelock becomes stuck.
Instead of allowing the CPU to enter a low-power state, the process may continue keeping the processor active—even when the phone is sitting unused. That can increase both battery consumption and device temperature.
Several other possibilities also fit the reported symptoms:
- A stuck background process tied to an app: In at least one investigated case, WhatsApp was reportedly stuck during its backup process after the update. This suggests the patch may have affected how certain apps handle background tasks.
- Security patch side effects: Because this was primarily a security update rather than a major feature release, the battery drain may be related to changes in background permissions, task scheduling, or power management.
- Fewer diagnostic options: Samsung’s removal of the full cache partition wipe option in February 2026 makes deeper troubleshooting more difficult. Users now have fewer ways to completely clear system-level cached data when investigating unusual behavior.
Taken together, the evidence points more toward a software bug or regression introduced by the patch than an intentional feature designed to consume additional battery.
Samsung’s History With Post-Update Battery Issues
Unfortunately, this isn’t an entirely new pattern for Samsung.
According to reporting surrounding the issue, this is at least the fifth separate incident of this type in the past three years. Some notable examples include:
- One UI 5.1: Excessive battery drain was eventually linked to the Samsung Keyboard app. Samsung acknowledged the issue after a support employee discussed it in a community forum, and the problem was addressed through a Galaxy Store update rather than a full firmware release.
- One UI 7: Galaxy S24 and Galaxy Z Fold 5 users reported similar battery-drain problems in 2025. The issue was later resolved with the June 2025 security patch.
- One UI 8.5: Galaxy Z Fold 7 users reported fresh battery-drain complaints in May and June 2026. These were addressed through maintenance patches and Galaxy Store updates.
The pattern is broadly similar: users report an issue, public acknowledgment is limited, and a later update eventually addresses the problem.
That history provides useful context. It suggests that the July 2026 battery issue may not be an isolated incident, but another example of the challenges involved in testing monthly security updates for background power-management problems.
Bug or Intentional Trade-Off?
Based on the available evidence, this looks much more like a bug than an intentional trade-off.
There are several reasons:
- The update didn’t introduce major features that would reasonably require significantly more background activity.
- A stuck wakelock and failure to release a process are consistent with a software defect.
- Samsung has experienced similar post-update battery regressions in the past.
The more accurate description is therefore regression.
In other words, something that previously worked correctly—such as allowing the phone to enter low-power states—may have stopped working properly after the update.
How to Fix or Minimize the Battery Drain
If you’ve already installed the update and are experiencing unusually fast battery drain, there’s currently no confirmed permanent solution. Samsung has not publicly acknowledged the issue or confirmed a dedicated fix.
However, several practical steps may reduce the impact while you wait for a potential software update.
Temporary Workarounds
- Check WhatsApp’s backup process: Since at least one reported case connected the drain to WhatsApp getting stuck during backup, check whether a backup is currently stalled. If necessary, cancel and restart the backup or temporarily disable automatic backups to see whether battery behavior improves.
- Clear individual app caches: Samsung removed the full cache partition wipe option from the recovery menu in February 2026. For now, clearing the cache of individual apps that appear to be misbehaving is a more targeted option.
- Reset or monitor battery statistics: Some community users have tried resetting battery statistics to force the system to recalculate power usage. While this isn’t a confirmed fix, it may help identify unusual background activity.
- Test Safe Mode: Safe Mode temporarily disables third-party apps. If battery drain improves significantly in Safe Mode, a specific app may be contributing to the problem.
- Restart the phone: A full restart can sometimes clear a stuck background process or wakelock temporarily. However, reports suggest the problem may return after some time.
- Avoid unnecessary heat: If your phone is already running hot, avoid leaving it in direct sunlight or under pillows, blankets, or other materials that can trap heat. If the device becomes unusually hot, powering it off completely is safer than leaving it idle.
Should You Roll Back the Update?
Rolling back to an earlier software version isn’t officially supported by Samsung and generally isn’t recommended, particularly for security updates.
Downgrading can expose your phone to vulnerabilities that the newer patch was designed to fix. Depending on the device, it can also be technically difficult or impossible because of bootloader restrictions and other software limitations.
If you haven’t installed the update yet, waiting is the simpler option.
If you’ve already installed it, rolling back isn’t generally advisable. Instead, monitor the battery, use the available workarounds, and wait for an official update that may address the problem.
Tips to Monitor Battery Health After the Update
Keep track of the following:
- Check your battery usage breakdown to see whether one app or Android System is consuming an unusually large amount of power.
- Pay attention to battery loss while the screen is off. Excessive standby drain may indicate background activity rather than normal usage.
- Monitor the phone’s temperature while charging and when sitting idle.
- Note exactly when the battery problem started. If it appeared immediately after the July 21 update, the timing is worth recording.
- Monitor Samsung Community forums and reliable technology outlets for information about a potential fix.
Given Samsung’s history with similar issues, a resolution could arrive through a future security patch or Galaxy Store update rather than a major public announcement.
Final Verdict
Samsung’s July 2026 security patch was supposed to be a routine update that most users would install and forget.
Instead, it has become another example of the challenges involved in shipping software updates that affect background power management.
The available evidence comes from user reports, community discussions, independent technology coverage, and technical investigations. Taken together, the reports suggest that this is more than a handful of completely isolated complaints.
However, it’s not a five-alarm disaster for every Galaxy owner.
The reports are heavily concentrated around the Galaxy S24 Ultra and Galaxy S25 Ultra, rather than the entire Galaxy lineup. Many devices appear to be working normally, while others are experiencing significant drain, heat, or overnight battery loss.
If you own an affected model and haven’t installed the update yet, waiting for a follow-up patch may be the safer choice.
If you’ve already installed it, monitor your battery closely and try the temporary workarounds above. Most importantly, don’t ignore significant overheating.
FAQs
Does this update affect all Galaxy models?
No. The Galaxy S24 Ultra and S25 Ultra appear to be the most affected, with fewer reports from other S24 and S25 models.
Will Samsung fix this?
Most likely. Samsung has fixed similar battery-drain issues through later updates, but there’s no official confirmation yet.
When will the fix arrive?
There’s no confirmed date. A fix could arrive with the August 2026 security patch or a later Galaxy Store update.
What’s causing the battery drain?
The leading explanation is a stuck CPU wakelock that keeps the processor active when the phone should be idle. In one reported case, WhatsApp’s backup process was also linked to the issue.
Is this a safety risk?
Overheating has been reported. If your phone becomes unusually hot while idle, power it off and avoid direct sunlight or other sources of heat.
Should I install the update?
If you have a Galaxy S24 Ultra or S25 Ultra, waiting for a follow-up patch may be reasonable. Other Galaxy users can install it but should monitor battery drain and temperature afterward.
