Closing background apps saves battery
iOS and Android use app suspension and intelligent background management to minimize battery drain. Manually force-closing apps and reopening them consumes more CPU and RAM than leaving them in their suspended state.
What we know
The belief that closing apps saves battery persists as a widespread smartphone practice, but it contradicts how modern mobile operating systems actually manage memory and power.
Both iOS and Android suspend apps when they are not in active use. A suspended app does not execute code, use the processor, or draw significant power. It remains in memory in an inactive state that can be instantly resumed, but it is not 'running' in the power-consuming sense. Apple's iOS uses a system it calls 'App Suspension', and Android uses 'Doze mode' and 'App Standby' to achieve the same effect.
When a user force-closes an app and then reopens it later, the operating system must perform a cold launch: loading all the app's code and data from storage into RAM, initializing the app's state, and drawing its initial screen. This cold launch requires the CPU to execute significantly more work than simply resuming a suspended app. Multiple smartphone manufacturers and Apple's own developer support documentation have explicitly stated that swiping away apps in the iOS app switcher does not improve battery life and can reduce it by causing repeated cold launches.
There are legitimate exceptions where closing an app does save battery. Apps that are actively executing code in the background with permission, such as GPS navigation, video calls, music streaming, or active downloads, genuinely consume power and should be closed when not needed. Apps that have permission to refresh their data in the background can also be limited through settings rather than force-closing. For misbehaving apps that are stuck or draining unusual power, force-closing is appropriate.
Common claims
- Swiping away apps from the multitasking screen saves battery.False. Suspended apps use negligible power; cold relaunching uses more.
- Background apps are always running and consuming battery.False. Suspended apps consume minimal resources; only permitted background processes run.
- Closing GPS or streaming apps saves battery.True. Apps actively using location, audio, or data streams continue running when backgrounded.