The verdict first: stop swiping apps away
- Closing apps does not save battery. Apps left in the background are mostly suspended, so they draw very little power while they wait for you.
- Reopening a closed app can cost more power. The phone has to reload the whole app from scratch, which uses more energy than waking a suspended app.
- The real battery wins are settings, not swiping. Background App Refresh, location access, screen brightness, and power modes decide how long your phone lasts.
- Close an app only when it misbehaves. A frozen app, a stuck map, or an app that keeps playing audio after you left it are fair reasons to close it.
That is the short answer, and it surprises almost everyone who hears it for the first time. The rest of this article explains why the habit feels helpful, why it usually is not, and what to change instead. By the end, you will know exactly which settings deserve your attention and which habit you can safely drop.
Contents
- The verdict first: stop swiping apps away
- Meet Imran, who swipes away fifty apps a day
- Why closing apps feels like it should work
- Why reopening apps can cost you more
- The one exception: when closing an app is the right move
- So what actually drains your battery?
- The hidden drain most people miss
- The 7-setting checklist that actually saves battery
- What about Android phones?
- Five battery myths, busted in one place
- When your battery is genuinely dying
- A two-minute daily routine that replaces the swiping habit
- Frequently asked questions
- The bottom line
Meet Imran, who swipes away fifty apps a day
Imran charges his phone every night, and by late afternoon it is usually gasping for power again. He blames the apps, so every hour or so he opens the app switcher and swipes every card away, one by one, until the screen is clean. He feels productive when he finishes, as if he has just tidied a messy room and given his phone room to breathe.
The trouble is that his battery never seems to improve, no matter how religiously he clears the switcher. Some days it even feels worse, because the apps he uses most, like his messages and his maps, take a beat longer to open after he has killed them. He assumed his phone was old, or that the battery was dying, and he started thinking about buying a new phone.
Imran is not doing anything unusual, and he is not doing anything foolish either, because the habit makes perfect sense on the surface. A running app sounds like a running tap, and closing it sounds like turning the tap off. The problem is that a phone does not work like a tap, and once you understand how it really works, the whole habit falls apart.
Why closing apps feels like it should work
The idea comes from computers, where a program left open really can keep using memory and processor power. On a phone, the system is designed very differently, because battery life matters more than almost anything else. When you leave an app, the phone does not let it keep running at full speed in the background.
Instead, the phone suspends the app, which means it freezes it in place and stops giving it processor time. The app sits in memory like a bookmark, ready to pick up exactly where you left it, but it is not actively doing work. That is why switching back to a suspended app feels instant, while opening a closed app takes a moment to load.
This is also why the app switcher is misleading, because it looks like a list of running programs. In reality, it is mostly a list of recent apps, like a history of what you have used, not a list of what is draining your battery right now. Swiping a card away does not stop a drain, because in most cases there was no drain happening in the first place.
Why reopening apps can cost you more
When you close an app completely, the phone has to start it again from zero the next time you tap it. It must load the app code, rebuild the screen, reload your data, and restore whatever you were doing, and all of that work takes processor power. Processor power is battery power, so a full relaunch is more expensive than simply waking a suspended app.
That cost is small for a single app, and you will never notice it from one reopen alone. The problem grows when you close dozens of apps and then reopen the same ones all day, because you pay the relaunch cost again and again. Your most-used apps, the ones you open twenty times a day, are exactly the ones you should leave alone.
Think of it like a book with a bookmark versus a book you have to find on a shelf every time. Waking a suspended app is opening to the bookmark, while relaunching a closed app is walking to the shelf, finding the book, and finding your page again. The walk is not huge, but doing it fifty times a day adds up to real effort.
The one exception: when closing an app is the right move
There are times when closing an app is genuinely useful, and knowing them makes the rule easier to follow. If an app freezes, stops responding, or shows a blank screen, closing it and reopening it is the standard fix. If an app keeps playing audio, tracking location, or showing a spinning indicator long after you left it, closing it can stop that specific misbehaviour.
A map app that keeps navigating after your trip, a music app that keeps streaming when you meant to stop it, or a camera app that stays warm in your pocket are all worth closing. The difference is that you are closing one misbehaving app for a reason, not clearing every app out of habit. That distinction is the whole trick, because targeted closing fixes problems while blanket closing creates extra work.
If one app keeps misbehaving again and again, closing it is only a bandage, and the real fix is elsewhere. Check whether that app has permission to use location always, whether its background refresh is on, or whether an update is available. A single badly behaved app can drain more battery than fifty suspended apps combined, so finding it matters more than swiping everything away.
So what actually drains your battery?
The screen is usually the biggest single drain, because a bright, large display running for hours uses more power than almost anything else. Radios are next, because weak mobile signal, constant searching for networks, and heavy video streaming all keep the phone working hard. Background activity comes third, but only for certain apps and certain permissions, not for every app sitting in the switcher.
Heat makes everything worse, because a hot phone works less efficiently and its battery ages faster over time. A phone left in direct sunlight, on a car dashboard, or under a pillow while charging will lose charge faster and wear its battery out sooner. Age matters too, because every battery slowly loses capacity over hundreds of charge cycles, and no setting can reverse that wear.
The good news is that most of these drains have a setting attached to them, which means you can control them. The bad news, if you can call it bad, is that none of those settings live in the app switcher. They live in the settings menus, and that is where the rest of this article is headed.
The hidden drain most people miss
Many phones lose battery quietly through background activity that the owner never sees, and it is easy to blame the wrong thing. An app with permission to refresh in the background can fetch new content all day, even when you never open it. An app with permission to use your location always can wake up the GPS again and again, which is one of the hungriest sensors in the phone.
Notifications add to the drain in a smaller way, because every buzz lights the screen, wakes the processor, and sometimes pulls fresh data. None of this is visible in the app switcher, which is why people keep swiping apps away while the real drain carries on untouched. If your battery drops sharply overnight, or while the phone sits idle in your pocket, background activity is the first place to look.
We covered this quiet drain in more detail in our guide to the hidden setting draining your phone battery, and it pairs well with this article. The two pieces together give you the full picture, because one explains the myth and the other explains the background settings behind it. Read both, and you will stop guessing about where your battery actually goes.
The 7-setting checklist that actually saves battery
This is the part worth saving, because these seven changes do what app-closing only pretends to do. Each one is a real setting, each one is easy to change, and none of them requires you to give up the apps you love. Work through them once, in order, and then leave them alone, because battery saving should be a setup job, not a daily chore.
Menu names vary by phone model and software version, so treat the directions below as signposts rather than exact button labels. If a setting is not exactly where you expect it, search for its name in your settings search bar. The setting itself matters far more than the exact path you take to reach it.
1. Turn off Background App Refresh for apps that do not need it
Background App Refresh lets apps fetch new content while you are not using them, so your feed is fresh when you open it. That convenience costs battery, because the phone wakes up, uses data, and processes new content for apps you may not open for days. Turn it off entirely if you want the biggest saving, or turn it off app by app for social feeds, shopping apps, and games.
Leave it on for the few apps where fresh data genuinely matters, like your messages or your email if you need instant delivery. For everything else, ask a simple question before you leave it on: do I need this app to be fresh before I open it, or can it refresh while I wait two seconds. Most apps pass the two-second test easily, and turning their refresh off is free battery with almost no downside.
2. Give location access only while you are using the app
Location is one of the most power-hungry features on a phone, because GPS, Wi-Fi scanning, and mobile towers all work together to pin down your position. An app with location access set to always can wake those systems up repeatedly, even when you have not opened the app in hours. Changing that permission to only while using the app means the app gets your location when you actually need it, and nothing when you do not.
Go through your location permissions once and be strict, especially with shopping, social, and game apps that have no good reason to know where you are all day. Keep always-on location only for the handful of apps that truly need it, like a family safety app or a navigation app you trust. This one change alone often explains a mysterious overnight drain, because a single always-location app can quietly do more damage than a whole switcher full of suspended apps.
3. Lower brightness and let auto-brightness help
The screen is the hungriest part of the phone, and brightness is the tap that controls it, so this setting punches above its weight. A screen at full brightness outdoors can drain the battery far faster than the same screen at a comfortable indoor level. Turning on auto-brightness lets the phone adjust to your surroundings, dimming indoors and brightening only when the sun demands it.
If auto-brightness feels too bright for your taste, set the brightness manually to a comfortable level and leave it there. Shortening the time before the screen locks also helps, because a screen that stays lit for five minutes after you put the phone down wastes far more power than one that sleeps in thirty seconds. These are small habits, but the screen is on for hours every day, so small savings multiply quickly.
4. Turn off Always-On Display if you do not need it
Always-On Display keeps part of the screen lit all day to show the time, date, and notifications at a glance. It looks elegant, and on some phones it uses very little power, but little power all day is still power all day. If you check your phone constantly anyway, the always-on screen is mostly showing information to an empty room.
Turning it off does not mean losing your notifications, because the screen still lights up when a message arrives or when you tap it. It simply means the display rests between those moments instead of glowing around the clock. Try it off for a week and watch your evening battery level, because this is one of those settings where the saving is invisible until you test it.
5. Use Dark Mode on an OLED screen
Dark Mode turns bright white backgrounds into dark ones, and on phones with OLED screens that saves real power. OLED screens light each pixel individually, so a black pixel is essentially switched off and draws almost no power. A white pixel, by contrast, has to shine at full strength, so an app full of white backgrounds is an app full of lit pixels.
The saving depends on your screen type, because older LCD screens light the whole panel no matter what colour is shown. On an LCD phone, Dark Mode still helps your eyes at night, but it will not save much battery. On a modern OLED phone, which covers most recent flagships, Dark Mode across your system and your most-used apps is a genuine, effort-free saving.
6. Limit the frame rate to 60Hz
High refresh rate screens, at 120Hz or more, feel wonderfully smooth when you scroll, because the display redraws itself twice as often. That smoothness has a cost, because redrawing the screen more often uses more processor and display power. Limiting the frame rate to 60Hz gives up a little of that silkiness in exchange for battery life that lasts noticeably longer.
This is a trade-off, not a free win, so try it before you commit to it permanently. Some people notice the difference immediately and hate it, while others barely notice it after a day. If you fall into the second group, keep the limit on and enjoy the extra hours, and if you fall into the first group, turn it back up without guilt. Battery tips should fit your life, not punish you for liking a smooth screen.
7. Use power modes and smarter charging habits
Low Power Mode is the phone’s own emergency brake, and it works by trimming background activity, mail fetching, visual effects, and some downloads. You can turn it on manually whenever your battery is low, and many phones let you set it to switch on automatically at twenty percent. Adaptive Power, where your phone offers it, goes further by learning your routine and trimming power for apps you rarely use.
Charging habits matter for the long term, because heat and full charges age a battery faster than normal use. Optimized Charging, where available, learns your routine and holds the charge below full until you actually need it, which reduces wear overnight. Keeping your charge roughly between twenty and eighty percent when you can is a gentle habit, not a strict rule, so do not stress about hitting those numbers exactly.
What about Android phones?
Everything in this article applies to Android too, even though the setting names are different and the menus move around more. Android phones also suspend apps in the background, so closing every app from the recent-apps screen costs you the same relaunch energy. Android also offers background restrictions, battery optimisation per app, location permissions, adaptive brightness, dark theme, and battery saver modes.
The names will differ by brand, and some brands add their own aggressive battery savers that can delay notifications. If an Android app stops notifying you after you restrict it, loosen that one app’s restriction rather than turning everything back on. The principle stays the same on both platforms, because the principle is about how modern phones manage apps, not about one company’s design.
If your Android phone feels slow as well as thirsty, our guide on how to speed up a slow phone without buying a new one covers the storage, cache, and app-cleanup steps that actually help. Battery and speed problems often share the same culprits, like a bloated app or a phone full to the brim. Fixing both together is usually easier than fixing either one alone.
Five battery myths, busted in one place
Myth one says closing apps saves battery, and you now know it mostly does the opposite for apps you reopen often. Myth two says you should kill all apps every night, but a suspended app overnight draws almost nothing, while a morning of relaunching everything costs real energy. Myth three says a task killer app will manage your battery for you, but these apps often fight the phone’s own system and can cause more wake-ups than they prevent.
Myth four says charging overnight ruins your battery, but modern phones with optimised charging handle overnight charging far better than old phones did. Heat is the real enemy during charging, not the overnight hours themselves, so a cool room and a decent charger matter more than unplugging at midnight. Myth five says you must drain the battery to zero before charging, but that advice comes from old battery chemistry, and modern lithium batteries prefer shallow, frequent top-ups.
When your battery is genuinely dying
Sometimes the problem is not a setting at all, and it is worth saying so plainly rather than promising a settings fix for everything. A battery that drops from full to empty in a couple of hours, swells, or shuts the phone off at twenty percent is telling you it has aged out. Check your battery health in settings, where most phones now show maximum capacity and whether the battery is still performing normally.
A battery health reading well below its original capacity means the phone cannot hold the charge it once did, no matter how perfect your settings are. In that case, a battery replacement is usually far cheaper than a new phone, and it restores the phone you already know. If the phone is also slow, hot, and struggling with basic tasks, then a replacement phone may make more sense, but let the battery health reading guide that decision.
A two-minute daily routine that replaces the swiping habit
Replace the hourly swiping ritual with a routine that takes two minutes and actually helps. In the morning, glance at your battery usage in settings and look for any app using far more power than its use justifies. At that moment, check that one app’s background refresh and location permissions, and fix only that app instead of clearing everything.
In the evening, if your battery is low, switch on Low Power Mode and lower your brightness a notch, then leave the phone alone. That is the whole routine, and it beats an entire day of swiping because it targets the real drain instead of the visible one. After a week of this routine, most people find their evening battery level is higher, and the urge to swipe fades on its own.
Frequently asked questions
Does closing apps save battery on iPhone?
No, not in general, because apps left in the background are suspended and draw very little power. Reopening a closed app uses more energy than waking a suspended one, so habitually closing everything can cost battery rather than save it.
Should I close apps at night?
No, there is no need to close apps before bed, because suspended apps draw almost nothing overnight. If your battery drops sharply overnight, look for a single app with background refresh or always-on location instead of clearing the whole switcher.
What drains iPhone battery the most?
The screen is usually the biggest drain, followed by weak signal, heavy streaming, and background activity from specific apps. Location always-on permissions and high brightness amplify those drains, which is why the checklist in this article targets them first.
Does Dark Mode really save battery?
Yes, on phones with OLED screens, because black pixels are essentially switched off and draw almost no power. On older LCD screens the saving is much smaller, because the whole panel stays lit regardless of colour.
Is Low Power Mode bad for my phone?
No, Low Power Mode is designed by the phone maker and simply trims background activity, visual effects, and fetching. It does not harm the phone, and you can switch it off at any time when you need full performance again.
Should I charge my phone to 100 percent every time?
You can, and modern phones handle full charges far better than old ones, especially with optimised charging turned on. Keeping the charge roughly between twenty and eighty percent when convenient can slow long-term wear, but it is a gentle habit, not a rule to stress about.
Why does my phone get hot and lose battery fast?
Heat is both a symptom and a cause, because a hot phone works less efficiently and its battery ages faster. Direct sunlight, intensive games, video recording, and weak signal all generate heat, so move to shade, close the demanding app, and let the phone cool down.
When should I replace my battery instead of changing settings?
Replace the battery when its health reading is well below original capacity, when it shuts off early, or when it swells. Settings cannot restore lost capacity, and a replacement is usually much cheaper than buying a new phone.
The bottom line
Stop swiping apps away to save battery, because the habit costs you more power than it saves for the apps you use every day. Leave your regular apps suspended, close only the ones that freeze or misbehave, and put your effort into the seven settings that actually control drain. Background refresh, location permissions, brightness, Always-On Display, Dark Mode, frame rate, and power modes are the real levers, and they work quietly in the background once you set them.
Your phone was designed to manage suspended apps for you, so let it do that job and save your attention for the one misbehaving app, the one greedy permission, or the one hot afternoon. Do the checklist once, check your battery usage when something looks wrong, and stop treating the app switcher like a chore. Your battery, and your thumb, will both thank you.
