Closing applications actually drains battery (Still under testing)

Discussion in 'iPad General Discussions' started by Ser Aphim, Apr 8, 2014.

  1. Ser Aphim

    Ser Aphim iPad Junkie

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    A fellow member Ardchoille posted an article about how to save battery life. The step that really caught my eye was "Closing apps actually drains battery life.". That kept me thinking though, how could leaving apps open save battery life? When we all know, that force closing apps actually saves battery life. Apparently is was from a former employee from the genius bar.

    I found a few articles about it. Many articles support the theory. Here is what LifeHacker say's about this:
    There was a comment saying that mobile multitasking isn't like multitasking in a computer, where running multiple programs will slow down the device. In iOS, when you exit an app, it automatically "Freezes it". iOS already closes apps automatically to free up RAM. Force closing apps and opening them again can cause stress and that stress could drain battery life.

    I'm not even sure if I should follow this. But I sure hell will test this!
     
    Last edited: Jul 29, 2014
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  2. ardchoille

    ardchoille iPad Addict

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    This is how it was explained to me:

    When you exit an app some of the app elements are cached so that the app will start up faster when it's needed again. The app isn't actually using system resources so it's safe to leave it cached, the system will free up memory as needed. Force closing an app, on the other hand, removes these cached elements so starting the app up again causes the system to have to restart the app "from scratch", and that uses more system resources than if the app were allowed to remain cached. It's easier on the system and battery if the user avoids force closing apps, except in the case of a problematic app, and allows the system to take care of the house cleaning. That former genius bar employee was spot on.

    I really think this is a *nix thing because Linux does the same thing. And, from what I understand, iOS is based on a variant of BSD. When it comes to a *nix system, unused ram is wasted ram.
     
    Last edited: Apr 8, 2014
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  3. s2mikey

    s2mikey iPad Addict

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    Hmmm.... Interesting concept. It kind of makes sense. But, somehow, I'm not sold completely. I've been so happy with battery life that I probably wouldn't notice anyways. :)
     
  4. Ser Aphim

    Ser Aphim iPad Junkie

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    Yeh I'm not sold either but I got to try this out for myself. If this gets to 12 hours, when the total I got is 10 or 11 hours, or even surpasses 12 hours I may be impressed.

    I noticed that opening apps is now faster. Seems like even if my battery life stays the same it will be faster for me to open apps :)
     
  5. ardchoille

    ardchoille iPad Addict

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    Yes, opening previously used apps will always be faster, so long as you don't force close them, that's the point of caching them - speed and less system resources required.
     
  6. The OB

    The OB Super Moderator Staff Member

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    There may be some substance to what both you guys (above) are saying.
    The following wisdom from Apple is saying that it's typically unnecessary to force an app to close as it seems to be sitting in a "suspended" state, implying not all of that app is there working in the background.
    http://support.apple.com/kb/ht5137

    And considering this background working (multitasking if you like) we further hear from Apple that the iPad will do its own thing to "lessen the effect on battery life" by scheduling its own background refreshing "for efficient times" like when connected to WiFi, or to a power source, "or being actively used"
    Bit of reading, but you'll find that here:
    http://support.apple.com/kb/HT4211

    And of course there are a lot of "experts" in this world, but this one seems to make some sense also:
    http://www.imore.com/tipb-answers-close-apps-multitasking-dock

    So, again, some interesting points raised by you guys. Thanks:)
    Andrew


    Sent from Oz using Tapatalk
     
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  7. Ser Aphim

    Ser Aphim iPad Junkie

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    Just in case someone says "So whats the point of force closing apps?!"

    So you can fix it when you are having problem with the app, as stated in the first link.
     
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  8. The OB

    The OB Super Moderator Staff Member

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    Yeah, I've had a tendency to force close all apps each night thinking this "cleans" up stuff. But it seems the iPad is designed to save us that work and itself looks after that side of it when necessary. Of course, best to force close an app that "misbehaves" so it can be reinstated afresh when next used, IMO.
    Andrew


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  9. Ser Aphim

    Ser Aphim iPad Junkie

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    So the only way to truly make an app run in the background is by turning in background app refresh.
     
  10. The OB

    The OB Super Moderator Staff Member

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    I think that's right. You can choose which apps will refresh and which apps the system will remove to tidy up the system, apparently after a period of time by Settings>General and choose which apps to refresh.
    Andrew


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  11. Ser Aphim

    Ser Aphim iPad Junkie

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    Basically I thought Facebook, and other social networking app or apps that downloads files coukd drain battery. But then it turns out that it will onky drain battery when there is an activity going on. Like posting photo's, videos, and other attachments. Until the activity is done, it would still remain open. It would close after the activity is finished. So no need to worry about that :/

    Here are the exceptions I found on articles I found that needs to be forced closed:
    So keep that in mind.
     
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  12. ardchoille

    ardchoille iPad Addict

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    I just performed a little test with Safari to show myself that apps don't typically continue working in the background after you press the home button.

    1. Open Safari
    2. Choose a website that hasn't been visited since cookies and data were last cleared
    3. As soon as the website begins to load, imediately press the home button
    4. Wait a minute or two and double-press the home button to view Safari in the multitasking view

    I noticed that the website still hadn't fully loaded (Safari was "frozen" due to being sent to the background), proof that Safari didn't continue loading a website in the background. I left it like that (multitasking view) for another minute and then opened Safari again to find the website was still loading.
     
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  13. Ser Aphim

    Ser Aphim iPad Junkie

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    Yeh I notice that too. I didn't care about it at first but right now that is helping me :)
     
  14. The OB

    The OB Super Moderator Staff Member

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    Yes that's interesting as it seems the system leaves a sort of "key" there so it "remembers" where it left off with a task. The same happens when you stop reading in a Book Mark or reading list and it returns to the same page that you were reading.
    Andrew


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  15. ardchoille

    ardchoille iPad Addict

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    Yep, that seems to prove that apps don't just go about their merry business when they are sent to the background.
     
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