Short answer: background battery use is what your apps spend while the screen is off, and Settings → Battery shows it — but only if you read the list correctly. Switch the list to Background, then compare each app's share of the day's drain against the time you actually spent in it. A mismatch is the signal; a background percentage by itself is not. Background work being a quarter or a third of a normal day's use is ordinary. One app eating that much while you used it for four minutes is not.
The rest of this page is the reading method, the numbers worth reacting to, and the fixes ordered by what they actually buy you.
Reading the two views in Settings → Battery
Open Settings → Battery and you get two different views of the same day. They answer different questions, and people usually look at only one.
By app (the list below the chart). Tap Show Activity to reveal per-app detail. Each app gets two numbers: Screen (on-screen time) and Background (time active while you were not looking), and the list itself is a share of total battery consumed. This is the view that answers "which app is draining my battery in the background."
By hour (the bar chart at the top). Tap a bar and the list below filters to that hour. The bars are battery level over time, so a steep drop with the screen off is a different event from a steep drop while you were scrolling. The same chart shows screen-on and screen-off periods as different shades, which is the fastest way to see whether a drop happened while you were using the phone or while it sat in your pocket.
Two details make the list much easier to read:
- The list is a share of consumption, not a measurement of energy. If total drain was small, a 40% share is a small amount of charge.
- The 24-hour and 10-day tabs answer different questions. Use 24 hours for "what happened today"; use 10 days for "is this a habit or a one-off."
Foreground vs background: what the split actually means
Foreground is work done while the app is on screen — you are watching the drain happen, and it is the price of whatever you were doing. Background is work done while another app, or no app, was on screen: a refresh, a push waking the app, a location update, an upload finishing, a photo library scan.
The important nuance is that "Background" on this screen means background activity, not "the app is secretly running." iOS suspends apps within seconds of leaving the screen; what remains is a short list of system-sanctioned reasons to wake — background refresh, push notifications, location, audio playback, VoIP, and system maintenance like indexing and photo analysis. So a nonzero background time is normal for almost any app you use.
There is also a second reading of the same word. The list sometimes shows background time larger than screen time — for example 2 minutes on screen and 40 minutes in the background. That is not automatically a fault. A messaging app that receives a steady stream of pushes, or a podcast app that played with the screen off, will legitimately do more background work than foreground work.
How much is normal? There is no Apple-published threshold. Two honest rules of thumb:
- Over a normal day of use, background activity is usually a minority of total drain. Screen and radio dominate.
- Over a standby-only day — phone idle, screen rarely on — background and system work can be most of the drain, because nothing else was competing with it. That is not a bug; it is the absence of a denominator.
So do not judge background by its percentage of the total. Judge it by whether the app's cost matches the value you got from it.
What the readings usually mean
| What you see | Usually means | What to do |
|---|---|---|
| One app with high background time and minutes of screen time, repeated on the 10-day view | That app is waking on pushes or refresh far more than you use it | Reconsider background refresh and notifications for that app only |
| Drain concentrated in the hours you were asleep, nothing high in the list | Radio work, push traffic, and system maintenance — normal standby behavior | Nothing yet; if it is large and consistent, see iOS 27 standby battery drain |
| A steep hourly drop with the screen on and a matching app at the top | Foreground use — you were watching a video, gaming, or navigating | Expected cost; lower brightness and volume matter more than any setting |
| Many apps each at a few percent, none dominant | Diffuse background work across many apps | This is the case where turning off background refresh wholesale genuinely helps |
| System services (Home & Lock Screen, Siri, Photos) high with heavy use | Lock-screen widgets, photo analysis, or Siri suggestions working in the background | Trim lock-screen widgets before blaming third-party apps |
| Background share climbs in the first days after an update | Post-update indexing and re-analysis | Wait about 72 hours before changing anything — see iOS 27 battery drain after update |
| High drain plus a body that stays warm with the screen off | Something running continuously | Restart the phone; if it persists, work the list below |
The last two rows are deliberately cautionary. A single bad afternoon is not a pattern, and the Battery list is a share-based view that will always name *someone* as the top consumer, even on a perfectly healthy day. Confirm a trend on the 10-day view before you change settings.
The fixes, ordered by what they actually buy
① Trim notifications for the loudest app. A push wakes the radio and often the app. For an app with heavy background time, turning off its notifications — or at least its badge and sound — removes the wake-ups at the source. This is often the single highest-value change and it is fully reversible.
② Make background refresh selective, not global. In Settings → General → Background App Refresh, keep it for chat, mail, and anything you rely on in real time, and turn off the rest. The mechanism is explained in What is Background App Refresh? — the point here is that selective is better than off, because a global off costs you real-time features and usually saves less than expected.
③ Fix location permissions. In Settings → Privacy & Security → Location Services, set apps that do not need live location to While Using, and review anything set to Always. Location tracking wakes the radio and the GPS repeatedly and is frequently a larger background consumer than refresh.
④ Check the lock screen and widgets. In Settings → Face ID & Passcode → Today View and Search, and in the lock-screen widget list, fewer live widgets means less background fetching. Widgets refresh on a budget, but a screen full of them spends that budget on things you may not read.
⑤ Restart the phone. If the drain started suddenly and nothing in the list explains it, a restart clears stuck background processes. It is not a fix for a real cause, but it is a fast way to rule one out.
⑥ Look at battery health, separately. A battery below 80% maximum capacity delivers less for the same work, which inflates every number in the list. That is a different problem with a different answer — see Battery Health Explained — and no background setting will compensate for it.
Battery "fixes" that do not work
- Swiping apps out of the app switcher. iOS has already suspended them. Force-closing costs you the cached state and makes the next launch do more work. It does not reduce background drain.
- Turning Background App Refresh off for everything, forever. It saves something, but push notifications are unaffected either way (they travel over Apple's push service, not refresh), and you pay for it with stale content in the apps where freshness matters.
- Closing every app before bed. Same as the first point, plus it delays real messages and re-syncs. The overnight drain comes from push, radio, and maintenance, not from apps sitting in the switcher.
- Blaming the update forever. Post-update indexing is real but bounded; Apple's own guidance is that it settles within about 72 hours. Past that window, look at the list instead of the calendar — the wider framework is in iOS 27 battery drain after update.
- Buying a battery app or a cleaner. iOS does not grant third-party apps the access such tools claim. No app can show you more than
Settings → Batterydoes. - Keeping Low Power Mode on permanently. It does limit background activity, and that is a legitimate tool for a tight day — but all day every day you pay in delayed notifications and reduced refresh rate for savings that are smaller than the experience cost, as set out in Low Power Mode, Honestly.
One closing note: background battery use is a measurement problem before it is a repair problem. Read the list in both views, compare share against screen time, confirm it on the 10-day tab, and change one thing at a time. If the phone also runs warm while idle, the heat angle is covered in Why Does My Phone Get Hot?.