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Samsung Galaxy S25 Ultra and S24 Ultra owners have reported severe battery drain and overheating after the July 2026 software update. These issues appear across multiple regions and affect both daily use and standby performance. This guide explains why the problem occurs and walks you through practical steps to diagnose, reduce, and resolve the drain and heat.
The tutorial is written for beginners and working professionals. Every technical term is explained the first time it appears. Follow the steps in order for the best results.
What You Need Your Galaxy S25 Ultra or S24 Ultra with the July 2026 update installed Stable Wi-Fi or mobile data connection A computer (Windows, macOS, or Linux) if you plan to use ADB commands USB-C cable for connecting the phone to the computer At least 30–45 minutes of uninterrupted time Optional: Samsung Members app already installed Understanding the July Update Issues
After the July security and feature update, many users noticed two main problems. Battery percentage drops faster than before, even with light use. The phone also becomes warm or hot near the camera module or top edge during normal tasks such as scrolling, navigation, or background syncing.
These symptoms often stem from a combination of factors. Aggressive background process management, changes in adaptive battery algorithms, or incomplete optimization of new system services can keep the CPU or modem active longer than necessary. In some cases, a poorly optimized app update that arrived alongside the system update worsens the drain.
Battery drain means the device consumes power faster than expected relative to previous software versions. Overheating occurs when the device temperature rises above normal operating range, typically above 40–42°C under light load.
Step-by-Step Guide
Step 1: Confirm the Update and Check Battery Usage
Open Settings and go to Software update. Verify that the July 2026 update is fully installed. Note the build number for reference.
Next, open Settings > Battery and device care > Battery. Tap Battery usage. Look at the last 24 hours and last 7 days. Identify any apps or system processes that consume unusually high percentages while the screen is off.
Pay special attention to “Android System,” “Phone services,” “Google Play services,” and any recently updated third-party apps. High screen-off drain is a clear indicator of background activity problems.
Step 2: Restart and Force Stop High-Drain Apps
Restart the phone. A simple reboot clears temporary caches and stops runaway processes.
After the phone restarts, return to Battery usage. Force stop any non-essential apps showing high background usage. Go to Settings > Apps, select the app, and tap Force stop. Avoid force-stopping core system apps such as System UI or Android System.
Step 3: Clear Cache Partition
Clearing the system cache partition often resolves post-update performance and thermal issues. This does not delete personal data.
Power off the device completely. Then boot into recovery mode:
For Galaxy S25 Ultra and S24 Ultra: Press and hold Volume Up + Power button until the Samsung logo appears, then release Power while continuing to hold Volume Up.
In the recovery menu, use Volume buttons to highlight “Wipe cache partition” and press Power to select. Confirm the action. When finished, select “Reboot system now.”
Step 4: Disable Adaptive Battery and Restricted Background Activity Temporarily
Adaptive Battery learns usage patterns and can sometimes restrict the wrong processes after a major update. Temporarily turn it off to test.
Go to Settings > Battery and device care > Battery > More battery settings. Toggle Adaptive battery off. Also review App power management and set high-drain apps to “Unrestricted” only if you need them to run freely for testing.
Monitor battery behavior for 12–24 hours after this change.
Step 5: Check for App Updates and Remove Problematic Apps
Open the Galaxy Store and Google Play Store. Update every app. Outdated apps frequently cause elevated CPU usage after system updates.
If a specific app consistently appears at the top of battery usage, consider uninstalling it temporarily. Reinstall later and observe whether the drain returns.
Step 6: Use Safe Mode to Isolate Third-Party Causes
Safe Mode loads only pre-installed system apps. This helps determine whether a third-party app is responsible.
To enter Safe Mode: Press and hold the Power button, then touch and hold “Power off” until the Safe Mode prompt appears. Confirm.
Use the phone normally in Safe Mode for several hours. If battery drain and heating disappear, a third-party app is the likely cause. Restart normally and uninstall recently added or updated apps one by one.
Step 7: Reset App Preferences and Network Settings
Resetting app preferences restores default permission and battery optimization states without deleting data.
Go to Settings > Apps > Menu (three dots) > Reset app preferences. Confirm.
Separately, reset network settings: Settings > General management > Reset > Reset network settings. This can resolve modem-related drain caused by unstable cellular or Wi-Fi connections after the update.
Step 8: Advanced Check with ADB (Optional for Professionals)
If the problem persists, use Android Debug Bridge (ADB) to inspect battery statistics and wake locks. Wake locks keep the CPU awake and are a common source of drain.
On your computer, install platform-tools from the official Android developer site. Enable Developer options on the phone (tap Build number seven times in About phone). Turn on USB debugging.
Connect the phone and run these commands:
text Copy adb devices adb shell dumpsys batterystats –reset adb shell dumpsys batterystats
After several hours of normal use, run the batterystats command again and look for high “Wake lock” times or suspicious “Partial wake locks.”
You can also check temperature with:
adb shell dumpsys battery
Note the temperature value. Sustained readings above 400 (40.0°C) under light load indicate a thermal problem.
Step 9: Check for a Follow-Up Software Update
Samsung frequently releases hotfixes within days or weeks of major complaints. Open Settings > Software update > Download and install. Also open the Samsung Members app and check the Support section for any known-issue notices related to the July update.
Step 10: Factory Reset as Last Resort
If none of the previous steps resolve severe drain and overheating, perform a factory data reset. Back up all important data first using Smart Switch or Google Backup.
Go to Settings > General management > Reset > Factory data reset. Confirm and wait for the process to complete. After setup, restore only essential apps and monitor battery behavior before reinstalling everything else.
Common Mistakes and Troubleshooting Skipping the cache partition wipe — Many users clear app cache only. The system cache partition is different and more effective after major updates. Leaving Adaptive Battery on during testing — This can mask the real cause. Disable it temporarily while diagnosing. Ignoring screen-off battery usage — Screen-on drain is expected. Focus on what happens when the phone is idle. Installing too many apps immediately after reset — Reintroduce apps gradually so you can identify the culprit. Using unofficial ADB tools — Always download platform-tools from the official Android developer website to avoid security risks. Assuming the issue is hardware — Most post-update drain and heating cases are software-related and fixable without service center visits.
If the phone still overheats severely even in Safe Mode and after a cache wipe, contact Samsung Support and provide the battery usage screenshots and build number. Keep the original packaging and proof of purchase ready if a hardware inspection becomes necessary.
Final Check
After completing the steps, charge the phone to 100% and use it normally for a full day. Check Battery usage again. Healthy behavior after the July update typically shows less than 5–8% drain overnight with the screen off and moderate drain during active use.
Feel the back of the phone during navigation, camera use, and idle periods. It should remain only slightly warm, not hot to the touch.
Summary
Severe battery drain and overheating on Galaxy S25 Ultra and S24 Ultra after the July 2026 update are widespread but usually software-related. Start with battery usage analysis, a system cache wipe, and Safe Mode testing. Disable Adaptive Battery temporarily, update all apps, and use ADB for deeper inspection if needed. A factory reset remains the final software solution.
Most users regain normal battery life and temperatures within one or two days of following these steps. Monitor for the next Samsung security or maintenance update, as it often contains further optimizations.
Next steps: Keep an eye on Samsung Members for official acknowledgments, maintain regular app updates, and consider setting a battery usage reminder every few days for the next two weeks. If the problem returns after a future update, repeat the cache partition wipe first—it remains the fastest and safest recovery action.