I never swipe my iPhone apps closed and you shouldn’t either after Apple’s warning – ignore ‘battery saving’ myth
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STOP swiping your iPhone apps closed every day – it's a big mistake. It's easy to think you're giving a big boost to your iPhone's battery life and performance, but it's just not true. I haven't swiped for years. You shouldn't either. On an iPhone, you have the app carousel that appears when you swipe up from the bottom of your screen and hold.
It's where your "active" apps appear, ordered by how recently you've used them. Plenty of people swipe these apps away, effectively force-quitting them. But it's actually better to leave them there. Swiping them closed can actually make your battery life worse.
So if you're swiping your apps closed multiple times a day, stop right there. Apple says that the only reason to ever swipe an app closed is if it's stopped working. In an official memo, Apple said: "If an app won't response or seems frozen, you can close it, then open it again.
"You should close an app only if it's unresponsive.". In another memo, Apple noted: "If an app isn't responding, you can quit it and then reopen it to try and resolve the issue. "Typically, there's no reason to quit an app; quitting it doesn't save battery power, for example.".
When you leave apps in the carousel, it means that they can be re-opened as efficiently as possible. They're not putting significant strain on your battery life, because they're kept in a suspended state. But if you close it, the app has to fully restart, which has a greater power demand.