Start where Android already did the diagnosis: Settings → Battery → Battery usage ranks apps by consumption, including background use, over the last 24 hours. For any app showing heavy background drain you don't expect, tap it and restrict its background activity — the documented setting stops it from running when you're not using it. The catch most people get backwards: force-closing apps all day increases battery use, because cold restarts cost more than the idle background state Google documents as optimized.
What does each battery setting do?
- Background restrictions (per-app): the app can't run, sync or fetch location when closed — notifications may delay, the documented trade-off.
- Adaptive Battery: Android's documented system feature that limits battery for apps you rarely use. Keep it on; it's the free win.
- Adaptive notifications/Battery manager features: brand skins (One UI, Pixel) document slightly different names, but every current skin ships a per-app battery page.
- Unrestricted/optimized/restricted: the three per-app states Android documents — optimized is right for almost everything; unrestricted only for apps you truly need live (e.g., a messaging app whose notifications matter).
Which apps are the usual documented suspects?
- Social and video apps with background refresh — the heaviest documented background users.
- Apps abusing location: Settings → Location → App permissions shows which apps get "allow all the time" — switch anything you don't recognize to "only while using."
- Poorly made widgets and live wallpapers — constant redraws document themselves in the battery screen.
- Signal-hunters in weak coverage: if the battery screen shows high "system" or "phone" drain at your location, that's your carrier's coverage, not an app — documented behavior, fixed only by Wi-Fi calling or geography.
What about battery saver and charging limits?
Battery Saver trades performance and background sync for hours — the documented big hammer for the last 20 percent of a day. Modern phones also document charge limits (Pixel, Samsung and others document 80-percent caps) that stretch battery lifespan rather than daily runtime — related but different problems, and the setting that matters for year-two battery health.
When is drain a hardware problem?
Check Settings → Battery → Battery health where your skin provides it: documented capacity below about 80 percent means the battery itself is aging — no settings fix chemistry. And if drain exploded after a specific app update, the battery screen's per-app history names it; uninstalling and waiting for a patch beats factory resets.
The verdict
Battery screen → restrict the top offending background apps → trim "all the time" location → stop force-closing. Fifteen minutes, documented tools, no task-killer apps — those are themselves a documented battery drain.
FAQ
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