Your phone was fine last week, and now it needs a charger before evening. The hard part is that you can’t tell whether one app is to blame, whether the network is wearing it down, or whether the battery itself is getting old. When your phone battery is draining fast, guessing wastes time, because both Android and iPhone already keep a record of where the charge went.
This walkthrough shows you how to read that record on a Pixel, a Samsung Galaxy and an iPhone. It then covers how to restrict only the app that deserves it, and how to tell app drain apart from weak-signal or battery-age problems. The menu paths were checked against Apple, Google and Samsung help pages on 29/09/2026, and each one names the software version it applies to. If your screen looks slightly different, look for the labels rather than the exact layout.
What Your Battery Usage Screen Actually Measures
The battery usage screen does not tell you how much power an app “takes” in absolute terms. It shows how the charge you used was split between apps and system activities. Each figure is a share of what was consumed. Google points out that because of rounding, the listed amounts may not add up to 100%. So an app at 30% hasn’t necessarily done anything wrong. It may just have been the thing you used most.
Screen-on versus background use
This is the most useful split on the screen. Every phone separates energy used while an app was open in front of you from energy used while it ran behind the scenes. iPhone shows it per app. Apple’s iPhone User Guide lists four labels you may see under an app:
- On screen means the app was open and visible. A long on-screen time explains higher usage.
- Background covers work done while you weren’t looking at the app. Apple’s examples are directions, playing music, syncing photos and fetching mail.
- Cellular coverage means the app was used while the signal was weak, which costs more battery.
- Notifications means the app woke your phone to check for new information.
Apple’s battery troubleshooting article describes the same ideas with slightly different names: “Background Activity”, “No Mobile Coverage and Low Signal”, “Notifications” and “Connected to Charger”. The last one means the app ran only while the phone was charging, so it used no battery at all. If your iPhone shows one wording and this guide uses the other, they mean the same thing.
On a Samsung Galaxy, the split appears as Screen on time and Screen off time under the battery details. On a Pixel, the battery usage page lets you switch between View by apps and View by systems, so you can see phone functions separately from apps.
“Background” does not mean “Background App Refresh”
On iPhone, this is where most of the confusion comes from. One iPhone 15 Plus owner on Apple Community described WhatsApp showing 6 hours 30 minutes of background activity even after they had turned off Background App Refresh. Apple’s own definitions explain how that can happen. Background use includes location tracking, audio and mail fetching, and Background App Refresh only controls whether suspended apps check for new content. Turning that one switch off leaves the other kinds of background work running. An Android Central forum post shows the same confusion on Samsung: TikTok still reported over an hour of background use even though, as the poster put it, all background activity was disabled.
The biggest number is not always the problem
Newer phones flag unusual drain themselves, and that flag matters more than rank. From iOS 26, the iPhone’s Daily Usage chart shows a day in orange when you’ve used more battery than usual, and it highlights the top three apps or activities that may explain it. 9to5Mac gave a clear example: the writer’s Weather app was flagged at 4% because it had barely been used, while Instagram at 6% wasn’t flagged because that much use explained it. On a Pixel, Google says you’ll get a notification if an app causes abnormal battery drain.
When you look at your own top row, ask three questions. Was the use mostly on screen or in the background? Has the phone flagged it? Is it an app or a system item such as signal? A high share for an app you used for hours on screen is expected. Heavy background use from an app you barely opened is what’s worth acting on.
What the screen can’t tell you
The usage screen splits up the charge you used. It doesn’t show how much charge the battery can still hold. Google notes that capacity is estimated separately by the battery’s fuel gauge and falls as the battery ages. An old battery with a perfectly normal app list can still die early. That case is covered in the overnight-drain section below.
How to See What Is Using Your Battery on Android
Android phones all keep this record under Settings > Battery, but Google and Samsung name the screens differently. Follow the steps for your brand, and write down what you find before changing anything.
On a Google Pixel (Android 14 and later)
Google’s Pixel help page gives this path. It is written for Android 14 and up, so check the labels if you’re on Android 17.
- Open the Settings app and tap Battery.
- Tap Battery usage. The chart shows your battery level since the last full charge.
- Tap View by apps to see which apps used the most, or View by systems to see phone functions.
- Tap any app to review how it’s allowed to use battery. Google recommends keeping battery optimisation on for all apps.
For a second opinion, Pixel 6 and later include a checker at Settings > Battery > Battery diagnostics > Battery draining too quickly, according to Google’s battery drain guide. On Pixel 10 and later, the top of the Battery usage page can show an AI-generated summary that points out the heaviest apps and compares your recent use with your average.
On a Samsung Galaxy (One UI 7 and later)
Samsung’s battery guide gives the path below. Samsung notes that screens vary by carrier, software version and model, so treat it as a guide on One UI 8 and 8.5.
- Open Settings and tap Battery.
- Tap View details.
- Check Screen on time and Screen off time, then scroll down to the per-app list.
If the screen-off time is much longer than you’d expect for a phone that sat on a table, background activity or signal is the likely area to look at next.
On Tecno, Infinix, Xiaomi and other brands
These brands add their own layer on top of Android, and their current battery menus couldn’t be checked against manufacturer documentation for this guide. Start in Settings, open the Battery (or Battery & performance) section, and look for a per-app list that separates foreground and background use. Don’t expect the same label names as a Pixel or Samsung.
Before you touch anything, note this down
For your top two or three rows, write down the app name, whether its use was mostly on screen or in the background, and whether the phone flagged it. If the drain started in the last few days, check that too. Google says a little extra drain after a software update is normal while the phone finishes optimising. After setup or a factory reset, the phone’s battery learning can take a few weeks to fully take effect. Give it a few days before restricting anything.
How to Check Battery Usage by App on iPhone
The iPhone’s battery screen was redesigned in iOS 26. Apple states that you need iOS 26 or later to see the Daily Usage chart. If you’re on an older version, your screen will look different, but the per-app detail works on the same idea.
Reading the Daily Usage chart (iOS 26 and iOS 27)
These steps follow Apple’s iPhone User Guide.
- Open the Settings app and tap Battery. The chart compares today with the last seven days. A blue bar means similar or lower usage, and an orange bar means higher than usual.
- Tap View All Battery Usage. Apple says this view covers the last eight days.
- Tap the day you want to check, especially an orange one or the morning after a bad night.
- Scroll down to App and System Activity and tap an app to see its usage for each day, along with its On screen, Background, Cellular coverage or Notifications detail.
Check for Insights first
Look above the Daily Usage chart before blaming any app. From iOS 18, Apple shows Insights such as “Ongoing iOS Update” (a recent update is finishing in the background) or “Ongoing Device Setup”. Apple says battery life returns to normal once these finish. After an update, it recommends waiting a few days and then checking again. With a new major release like iOS 27, that wait can save you from changing settings you didn’t need to touch.
Which label points where
Each label leads you to a different fix. A large On screen figure is simply your own use, and the fix is the display settings Apple suggests on the same screen, such as auto-brightness and auto-lock. Background and Notifications point to the app controls in the next section. Cellular coverage (or “No Mobile Coverage and Low Signal”) points away from the app and towards your network, which the overnight section deals with.
How to Stop Apps From Draining Battery in the Background
Once you know which app is responsible and what kind of use it is, you can switch off that specific behaviour instead of crippling the whole phone. First, though, drop the habit that doesn’t work.
Swiping apps closed doesn’t save battery
Apple says you should close an app only if it’s unresponsive. It explains that closing all your apps does not affect overall performance, because recently used apps only use power while they’re active or doing specific background tasks. Apple also notes that suspended apps aren’t taking up system resources. And if you quit an app from the app switcher, it may not be able to check for new content until you open it again. Closing WhatsApp to save battery can simply mean your messages arrive late.
Match the label to the setting
The table below links what the battery screen showed you to the control that governs it. The paths come from the Apple, Google and Samsung pages linked in the sections that follow.
| What the battery screen shows | Setting to change | What you may lose |
|---|---|---|
| iPhone: Background, from an app that refreshes feeds | Settings > General > Background App Refresh | Content is fresher only after you open the app |
| iPhone: Background, from an app tracking you | Settings > Privacy & Security > Location Services > app | Location features when the app is closed |
| iPhone: Background from Mail | Settings > Apps > Mail > Mail Accounts > Fetch New Data | New mail checked less often |
| iPhone: Notifications | Settings > Notifications > app | Fewer alerts from that app |
| Pixel: high background use | Battery usage > View by apps > app > background usage | Delayed updates or alerts from that app |
| Samsung: long screen-off time from one app | Settings > Battery > Background usage limits | The app may not run until you open it |
Use each row for the specific app you identified. Don’t apply them across the board. Messaging and email apps need some background access to deliver on time.
iPhone controls
Background App Refresh. Go to Settings > General > Background App Refresh. Apple’s steps let you turn the feature off entirely, or limit it to Wi-Fi only or Wi-Fi & Cellular Data. You can also switch it off for individual apps in the list below, which is the better choice for a single offender.
Location. Go to Settings > Privacy & Security > Location Services and tap the app. Apple defines “Always” as allowing location access even when the app is in the background. “While Using the App” limits access to when the app or one of its features is on screen. Switching a non-navigation app from Always to While Using removes one source of background work.
Mail. Go to Settings > Apps > Mail > Mail Accounts > Fetch New Data. Apple explains that the default “Automatically” setting fetches in the background only when the phone is charging and on Wi-Fi. If you chose a frequent schedule in the past, check it here.
Notifications. If an app shows the Notifications label, Apple suggests adjusting that app’s notifications so it wakes the device less often. The controls are under Settings > Notifications > the app.
Pixel controls
From Settings > Battery > Battery usage > View by apps, tap the app to change its background battery usage. Google recommends keeping battery optimisation on for every app. It also warns that turning optimisation off lets an app run more while you aren’t using it, which can use more battery than needed. For an app that keeps syncing data, one Android Police writer described restricting background data under Settings > Apps > the app > Mobile data & Wi-Fi.
If restricting doesn’t help, Google’s order is to force stop the problem app, then uninstall it. Google warns that force stopping some essential apps or services will stop your phone working correctly. It also says Google Play services can’t be force stopped or uninstalled at all.
Samsung controls
Go to Settings > Battery > Background usage limits. Samsung’s options are:
- Sleeping apps don’t run in the background, but they may run again once you start using them.
- Deep sleeping apps never run in the background and only work when you open them.
- Never auto sleeping apps are excluded from sleep. Use this for apps you must always receive from.
Before you add anything to the Deep sleeping list, think about what that app does for you. Given Samsung’s definition, putting WhatsApp, your banking app or your alarm app there would likely stop it delivering anything until you open it. Deep sleep suits apps you rarely use, not the ones you rely on.
Why Your Battery Drains Overnight (When It Isn’t an App)
Sometimes the app list looks normal and the phone still loses a large chunk of charge while you sleep. In that case the cause is usually outside the list: the network, a recent update, a software fault, or the battery itself.
Weak signal makes the phone work harder
Android’s developer documentation says searching for a cell signal is one of the most power-draining operations on a mobile device. It also explains that the radio uses significant power when fully active and very little when in standby. Apple gives the matching advice: Wi-Fi uses less battery than mobile networks, both work more efficiently where the signal is strong, and Airplane Mode is worth switching on if you know you’ll have no coverage for some time.
This is a documented problem in parts of Nigeria. A June 2026 NCC report prepared with Ookla, covering data from June 2025 to May 2026, classified 5.9% of its national tracking grid as “High Battery Consumption Zones”. It classified a further 0.8% as places where phones overheat and drain at the same time. The report attributes this to phones being “constantly amplified to maintain contact with a distant tower or repeatedly trying to reconnect”. If your iPhone shows Cellular coverage near the top, or your phone sits in a room with one bar of signal, the network may be the culprit rather than any app. On iPhone 12 and later, Apple says 5G Auto (Settings > Cellular > Cellular Data Options > Voice & Data) switches to LTE when 5G wouldn’t noticeably help, which saves battery.
Updates and software bugs
Extra drain in the days after an update is expected on both platforms, as covered above. A fault in the operating system is a different matter, and no app setting will fix it. In 2026, some Pixel owners hit exactly this. Gadget Hacks reported that Google acknowledged an idle-drain bug on 14/04/2026, and that the drain continued even in Airplane Mode. XDA later reported that Google marked the bug fixed in a July build for the Pixel 10 and Pixel 9, with a fix for the Pixel 8a and 9a planned for the September quarterly release, although some users still reported drain afterwards. The lesson applies beyond Pixels. If drain continues in Airplane Mode with a clean app list, update the phone and check the manufacturer’s support forum before you reset anything.
An ageing battery
If none of the above fits, check the battery’s condition. Apple says iPhone 14 and earlier batteries are designed to keep 80% of their original capacity at 500 complete charge cycles, and iPhone 15 models at 1000, under ideal conditions. It also says cold and a low state of charge temporarily make unexpected shutdowns more likely. You’ll find the iPhone battery health percentage under Settings > Battery > Battery Health on iPhone 15 and later, or Battery Health & Charging on iPhone 14 and earlier. On Pixel 8a and later, Google’s path is Settings > Battery > Battery health, where “Reduced” means capacity has dropped below 80%. On a Galaxy, Samsung points you to the Samsung Members app, then Support > Get Started > Battery status. Battery replacement is a job for an authorised service centre, not a home repair.
Putting the checks in order
The sequence below puts these checks in the order that rules out the cheapest causes first. It’s a suggested order based on the vendor guidance above, not a procedure any single manufacturer publishes.
- Check the calendar. If the drain began within a few days of a software update, wait a few more days and check again.
- Read the battery screen. Classify the top row as on-screen use, background use or a system/signal item, and note whether the phone flagged it.
- Restrict one app. Apply the matching control from the table, then compare the same screen after a day or two.
- Compare a few nights. Leave the phone unplugged one night as normal, and another night with mobile data off and Wi-Fi on. WhatsApp and other apps will then only receive over Wi-Fi. If the loss shrinks a lot without mobile data, signal is the likely cause.
- Try Airplane Mode once, for diagnosis. You won’t receive calls or messages that night. If the drain continues even then, suspect a software fault and check for updates.
- Check battery health. If everything above is clean, the battery’s capacity is the next thing to look at.
What to Check First
Start with the battery usage screen. It separates your own screen time from background work and weak-signal drain far more reliably than guessing. If one app shows heavy background use it hasn’t earned, restrict that app alone, and don’t bother swiping everything closed. If the list is clean but the charge still disappears overnight, test the signal, check for a software fault, and then check the battery’s health, in that order.
Frequently Asked Questions
Does closing apps from the recent apps screen help?
No. Apple says closing all your apps doesn’t affect overall performance, and it recommends closing an app only when it stops responding. Closed apps may also be unable to check for new content until you reopen them.
Should I switch on Airplane Mode every night?
It’s a useful one-night test to see whether signal is causing the drain, and Apple suggests it when you know you’ll have no coverage. As a nightly habit, it means calls and messages won’t reach you until you switch it off. If weak signal is the problem, keeping Wi-Fi on is a gentler compromise.
Can I put WhatsApp in Deep sleeping or Restricted mode?
You can, but it’s risky for a messaging app. Samsung says deep sleeping apps only work when you open them. Google recommends keeping optimisation on rather than removing all limits, and it notes that its battery learning may delay notifications. If WhatsApp is draining heavily, check its location and notification settings first.
Why did my battery get worse right after an update?
Both Apple and Google say some extra drain after an update is normal while the phone finishes background tasks, and both advise waiting a few days. If it hasn’t improved after that, work through the checks above.
How much should my battery drop overnight?
Neither Apple nor Google publishes a standard overnight figure, and your apps, signal and battery age all affect it. The most useful benchmark is your own phone: compare a few nights using the step-by-step order above, and look at whether the iPhone’s Daily Usage chart or a Pixel’s abnormal-drain alert flags the night as unusual.
