Galaxy A57 battery drains overnight when something keeps working while the screen is off, such as background apps, weak signal, location tracking, sync, or Always On Display. This does not always mean the battery is bad. In many cases, the phone is simply doing too much while it should be idle.
A small drop overnight is normal. But when the battery falls by 15, 20, or even 30 percent while you are asleep, that points to a setting, app, network issue, or software behavior that needs checking.
For broader symptoms, you can also check our guide on battery problems. But for overnight drain specifically, start with the steps below.
Quick Checks Before Changing Anything
Restart the phone first. A restart clears temporary software glitches and stops apps that may be stuck running in the background.
Next, check whether the phone feels warm in the morning. A warm phone after being unused overnight usually means something was active for hours. It could be an app syncing, mobile data searching for signal, cloud backup, or a process that failed to stop.
Also, make sure your apps are updated from the Play Store and Galaxy Store. Some battery life issues appear after a One UI update because apps still need their own updates to work properly.
When the issue is not only overnight drain but general fast discharge throughout the day, use our guide on battery draining fast for a wider troubleshooting path.
Check Battery Usage in the Morning
The best time to check battery usage is right after waking up, before you start using the phone. This gives you a cleaner view of what happened overnight.
Go to Settings, tap Battery, then check Battery usage. Look for apps that used power while you were asleep. Messaging apps, cloud backup apps, social media apps, email, weather apps, and smart home apps are common suspects.
This is especially helpful when the Galaxy A57 battery drain while idle does not make sense. The screen may be off, but an app can still sync, refresh feeds, check location, or push notifications in the background.
A suspicious app is one you barely used but still appears high in the list. Force closing it may help once, but the better fix is to limit its background activity or adjust its notification, sync, or location permissions.
Turn Off Always On Display Overnight
Always On Display is useful, but it can contribute to overnight battery drain. It keeps part of the screen active so you can see the clock and notifications without waking the phone.
Try turning it off for one night and compare the battery drop the next morning. You do not have to disable it forever. You can also use a schedule so it only appears during the hours you actually need it.
This is a good first test when the Galaxy A57 loses battery overnight but no single app stands out in Battery usage.
Display-related behavior can also overlap with other screen issues. When the screen turns on by itself, flickers, or responds oddly, check our guide on display and touchscreen problems.
Limit Background Apps Without Breaking Notifications
Background apps are one of the biggest reasons a phone battery drains while not in use. Samsung gives you tools to control this, but you should use them carefully.
In Battery settings, check Background usage limits. Put rarely used apps into Sleeping apps. Put apps you almost never open into Deep sleeping apps.
Do not put everything into deep sleep. Messaging apps, banking apps, authenticator apps, delivery apps, ride-hailing apps, alarms, and smart home apps may need to send alerts on time. Deep sleeping those apps may save battery, but it can also delay important notifications.
The goal is simple: restrict apps that waste power, not apps you depend on.
Check Wi-Fi, Mobile Signal, and 5G
Weak signal can drain the battery overnight because the phone keeps working to stay connected. This can happen with Wi-Fi, mobile data, or 5G.
When the Samsung Galaxy A57 battery drains overnight more in one room than another, signal strength may be the reason. A weak mobile signal in your bedroom can cause the phone to search harder for a connection all night.
Try leaving the phone on Wi-Fi overnight if mobile signal is weak. You can also test Airplane Mode with Wi-Fi enabled for one night to see if mobile network searching is the cause.
For SIM, mobile data, or 5G-related issues, check our guide on mobile data and 5G problems. Wireless scanning can also affect idle drain, so our guide on Wi-Fi and Bluetooth problems may help too.
Review Location Access and Sync
Location access can quietly use battery overnight. Weather apps, maps, social media apps, fitness apps, and smart home apps may check your location even when you are not actively using them.
Change location access to “while using the app” for apps that do not need constant tracking. Also check account sync, photo backup, email sync, and cloud storage apps. These can run overnight when the phone is charging, connected to Wi-Fi, or idle.
Galaxy A57 battery draining while not in use often comes from this combination: background sync, location access, and weak signal. Fixing just one may help, but fixing all three is better.
Check Charging Habits Too
Sometimes overnight drain is confused with charging trouble. The phone may not be charging fully, or it may stop charging because of a bad cable, loose adapter, dirty port, or heat.
When you wake up and the battery is much lower than expected even though it was plugged in, check the charger first. Try another cable and adapter. Make sure the phone is actually charging before leaving it overnight.
For slow charging, charging pauses, or cable detection issues, use our guide on charging problems.
When Overnight Drain May Need Service
Software fixes should solve most idle battery drain cases. But service may be needed when the phone drains heavily every night after a reset, shuts down with battery left, gets hot while unused, or shows unusual charging behavior.
Stop using the phone and contact Samsung support or an authorized repair center if the body is swelling, the back cover is lifting, or the phone becomes unusually hot while idle.
You can also use our main page for Galaxy A57 problems if the battery drain appears together with performance, sound, camera, or lock screen issues.
Galaxy A57 Overnight Battery Drain Checklist
- Restart the phone
- Check Battery usage in the morning
- Turn off Always On Display overnight
- Limit background apps
- Update apps from the Play Store and Galaxy Store
- Use Wi-Fi when mobile signal is weak
- Test Airplane Mode with Wi-Fi enabled
- Review location permissions
- Check cloud backup and account sync
- Try another charger if the phone was plugged in
- Contact support if the phone gets hot while idle
FAQs
Why does my Galaxy A57 lose battery overnight?
The most common causes are background apps, Always On Display, weak signal, location access, account sync, cloud backup, or mobile network searching while the phone is idle.
Is overnight battery drain normal?
A small drop is normal. A large drop, such as 15 to 30 percent overnight, usually means an app, setting, network issue, or software behavior is using power in the background.
Can 5G cause overnight battery drain?
Yes. Weak or unstable 5G coverage can make the phone keep searching for a stronger connection, which may drain more battery while idle.
Should I turn on Power Saving mode overnight?
Power Saving mode can help, especially when you need the phone to last until morning. But you should still check Battery usage to find the real cause.
