Lavender Galaxy A37 standing upright on a matte professional tech table with the One UI 8.5 software information screen open, a blurred plant, desk lamp, and clean workspace background behind it.

How to Fix Fast Battery Drain After a One UI Update on Galaxy A37 5G

Posted on May 9, 2026

If your Galaxy A37 5G battery drains fast after a One UI update, give the phone 24 to 48 hours to finish optimizing, then check Battery usage, update your apps, restart the phone, limit background activity, and adjust battery-heavy settings like 5G, Always On Display, brightness, and location access.

A One UI update can temporarily increase battery use because the phone may be rebuilding app caches, syncing data, updating Samsung services, and re-learning your usage patterns. That is normal for a short period. But if the battery still drains quickly after a few days, you need to check which app, setting, or background process is causing it.

For general battery fixes that are not update-specific, read our full guide here: Why Is the Battery Draining So Fast on the Galaxy A37 5G?

You can also visit our main Galaxy A37 guide hub here: Samsung Galaxy A37 Hub

Why Battery Drain Happens After a One UI Update

Battery drain after a One UI update usually happens because the phone is doing more work in the background than usual.

After an update, your Galaxy A37 5G may:

  • Rebuild app caches
  • Re-index files, photos, and system data
  • Update Samsung and Google services
  • Re-sync accounts
  • Relearn battery usage patterns
  • Re-enable some settings
  • Run app updates in the background
  • Deal with apps that are not yet optimized for the new One UI version

The key is timing. If the drain happens only during the first day or two, it may settle on its own. If the phone still drains fast after 48 hours, gets warm while idle, or loses a lot of battery overnight, use the fixes below.

1. Give the Phone 24 to 48 Hours After the Update

Do not judge battery life immediately after installing a One UI update.

Right after an update, the Galaxy A37 5G may use more power than normal because the system is still settling. This can happen even if you are not actively using the phone.

What to do:

  1. Charge the phone normally.
  2. Restart it once after the update finishes.
  3. Use it normally for 24 to 48 hours.
  4. Avoid installing too many new apps during this period.
  5. Keep the phone on Wi-Fi when possible.
  6. Check if the battery drain improves after two days.

This is especially important after a major One UI update, not just a small security patch.

If the battery improves after a day or two, you probably do not need deeper troubleshooting. If it does not, continue with the next fix.

2. Check Battery Usage Before Changing More Settings

Do this before turning off random features. Battery usage tells you what is actually draining power.

  1. Open Settings.
  2. Tap Battery.
  3. Tap Battery usage.
  4. Check which apps are using the most battery.
  5. Look for apps using power even when you barely opened them.
Lavender Galaxy A37 standing upright on a clean white tech table with the Battery settings screen open, showing 15% battery, daily usage chart, app battery usage, a blurred plant, books, and a desk lamp in the background.
The Galaxy A37 Battery settings screen shows low battery percentage, daily usage, and app battery activity, which are key details to check when the battery is draining fast.

After a One UI update, watch for apps that suddenly move to the top of the list, such as:

  • Social media apps
  • Messaging apps
  • Games
  • VPN apps
  • Weather apps
  • Shopping apps
  • Streaming apps
  • Navigation apps
  • Fitness or health tracking apps

If one app is using too much power, update it first. If it still drains the battery, restrict its background use.

To restrict a problem app:

  1. Open Settings.
  2. Tap Apps.
  3. Select the app.
  4. Tap Battery.
  5. Choose Optimized or Restricted.

Do not restrict apps that need real-time alerts, such as banking, messaging, delivery, security, or work apps.

For a broader battery troubleshooting checklist, use this related guide: Galaxy A37 5G battery draining fast

3. Update All Apps After Updating One UI

A One UI update can expose old app bugs. Some apps may drain battery because they are not fully optimized for the newer software yet.

Update apps from the Play Store:

  1. Open the Google Play Store.
  2. Tap your profile icon.
  3. Tap Manage apps and device.
  4. Tap Update all.

Then update Samsung apps:

  1. Open the Galaxy Store.
  2. Tap Menu.
  3. Tap Updates.
  4. Install available updates.

After updating apps, restart the phone.

This fix matters because One UI updates often change how apps interact with notifications, background activity, permissions, and battery management. An outdated app can keep waking the phone even when the screen is off.

4. Restart the Phone and Clear Temporary App Issues

A restart is simple, but it is one of the safest first fixes after a system update.

  1. Press and hold the Side button and Volume Down button.
  2. Tap Restart.
  3. Wait for the phone to turn back on.
  4. Use it normally for a few hours.
  5. Check Battery usage again.

If one app still drains battery after the restart, clear that app’s cache.

  1. Open Settings.
  2. Tap Apps.
  3. Select the problem app.
  4. Tap Storage.
  5. Tap Clear cache.

Do not tap Clear data unless you are ready to sign in again or reset that app’s settings.

This is useful when the battery drain started right after the update and only one or two apps behave badly.

5. Turn On Background Usage Limits

After a One UI update, some apps may start running more often in the background. Background usage limits help control apps you do not use every day.

  1. Open Settings.
  2. Tap Battery.
  3. Tap Background usage limits.
  4. Turn on Put unused apps to sleep.
  5. Add rarely used apps to Sleeping apps or Deep sleeping apps.

Use Sleeping apps for apps you still open sometimes.

Use Deep sleeping apps for apps you rarely use and do not need notifications from.

Good apps to put into deep sleep include:

  • Old games
  • Shopping apps
  • Food delivery apps
  • Travel apps
  • Photo editors
  • Promo apps
  • Apps you installed once and forgot

Avoid putting important messaging, banking, health, security, calendar, and work apps into deep sleep unless you are okay with delayed notifications.

6. Recheck 5G, Always On Display, Brightness, and Location

A One UI update can sometimes change how settings behave, or it may make battery-heavy features more noticeable.

Check these four settings first.

5G and mobile signal

If your Galaxy A37 5G drains faster on mobile data than Wi-Fi, weak 5G signal may be part of the problem.

  1. Open Settings.
  2. Tap Connections.
  3. Tap Mobile networks.
  4. Tap Network mode.
  5. Choose LTE temporarily if 5G is weak in your area.

Use 5G again when you need faster mobile data or when the signal is strong.

Always On Display

Always On Display can drain power while the phone is idle.

  1. Open Settings.
  2. Tap Lock screen and AOD.
  3. Tap Always On Display.
  4. Turn it off or set it to show only when tapped.

Brightness and screen timeout

  1. Open Settings.
  2. Tap Display.
  3. Lower the brightness.
  4. Turn on Adaptive brightness if you prefer automatic adjustment.
  5. Tap Screen timeout.
  6. Choose 30 seconds or 1 minute.

Location access

Some apps may request more location activity after an update.

  1. Open Settings.
  2. Tap Location.
  3. Tap App permissions.
  4. Change unnecessary apps to Allow only while using the app.

These settings are also covered in more detail in our full guide on Galaxy A37 5G battery drain, but they are worth checking again after every major One UI update.

7. Reset All Settings if the Drain Still Continues

If the battery still drains fast after updates, app checks, and background limits, reset all settings before doing anything more drastic.

This does not delete your photos, videos, apps, or personal files.

  1. Open Settings.
  2. Tap General management.
  3. Tap Reset.
  4. Tap Reset all settings.
  5. Confirm the reset.
  6. Restart your Galaxy A37 5G.
  7. Test battery life for one full day.

Resetting all settings can fix battery drain caused by changed system preferences, network behavior, permission issues, or settings that did not carry over cleanly after the One UI update.

Use this before considering a factory reset.

Best Fixes by Situation

What you notice after the One UI updateBest fix to try first
Battery drain only happened on the first dayWait 24 to 48 hours
One app is using too much batteryUpdate it, clear cache, or restrict background use
Battery drains while idleTurn off Always On Display and limit background apps
Battery drains faster on mobile dataUse Wi-Fi or switch to LTE temporarily
Phone feels warm after updateRestart, update apps, and wait for optimization
Drain started after changing settingsReset all settings
Battery still drains after several daysFollow the full battery guide and contact support if needed

When You Should Worry

Battery drain after a One UI update is usually temporary. But you should take it more seriously if:

  • Battery drops heavily overnight
  • The phone gets warm while idle
  • Battery usage shows an app running constantly
  • The drain continues after 48 hours
  • The phone shuts down unexpectedly
  • Charging behavior also becomes unusual
  • The battery drains fast even after resetting settings

If the problem is not specific to the update anymore, use the broader troubleshooting steps here: Why Is the Battery Draining So Fast on the Galaxy A37 5G?

For more Galaxy A37 fixes, updates, and related guides, visit the Samsung Galaxy A37 hub.

Final Advice

Do not factory reset your Galaxy A37 5G right away. After a One UI update, fast battery drain is often caused by temporary optimization, outdated apps, background activity, 5G signal hunting, or display settings.

Start with this order:

  1. Wait 24 to 48 hours.
  2. Check Battery usage.
  3. Update apps from the Play Store and Galaxy Store.
  4. Restart the phone.
  5. Restrict battery-hungry apps.
  6. Recheck 5G, Always On Display, brightness, and location.
  7. Reset all settings if the problem continues.

If the drain still happens after all of that, move to the full battery troubleshooting guide for the Galaxy A37 5G: https://techdailyguides.com/galaxy-a37-5g-battery-draining-fast/

FAQs

Is battery drain normal after a One UI update on the Galaxy A37 5G?

Yes, some battery drain can be normal for the first 24 to 48 hours after a One UI update. The phone may be optimizing apps, syncing data, and rebuilding background processes. If the drain continues after two days, check Battery usage and update your apps.

Why does my Galaxy A37 5G get warm after a One UI update?

Your phone may get warm because it is running background optimization, app updates, account syncing, or file indexing after the update. Restart the phone, keep apps updated, and avoid heavy gaming or charging during long update-related background activity.

Should I factory reset my Galaxy A37 5G after a One UI update?

Not immediately. Try waiting 48 hours, updating apps, checking Battery usage, restricting background apps, adjusting 5G and display settings, and resetting all settings first. A factory reset should only be used when practical fixes fail.

Sources

Author

  • Harold writes tech tutorials, troubleshooting guides, and SEO-driven content for readers who just want their devices to behave.

    With years of experience in technical support, video editing, and digital publishing, he knows how to explain complicated problems without sounding like a manual written by a robot having a bad day.

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