Is it harmful to keep iPhone always plugged in to save battery cycles?

Discussion in 'iPhone' started by Aneef, Sep 25, 2017.


Is it harmful to keep iPhone always plugged on to save battery cycles?

  1. Yes

    21 vote(s)
  2. No

    55 vote(s)
  3. May be/Sort of

    11 vote(s)
  1. Aneef macrumors regular


    Jun 4, 2015
    Lahore, Pakistan
    Hey there,

    I purchased my iPhone 7 plus last November and currently its battery is down to 93.4% and 240 charge cycles.
    I needed to ask that in order to prolong the battery life (as in long-life of battery), is it advisable to keep the iPhone always (or most of the time, like currently I am at 100% battery but still have my iPhone plugged in to my Mac) plugged in to decrease the number of charge cycles?

    Screen Shot 2017-09-26 at 09.01.19.png
  2. 0007776 Suspended


    Jul 11, 2006
    I don't think it would be harmful, it stops charging when full. But if you are leaving it plugged in all the time why not save money and just get a landline?
  3. Aneef thread starter macrumors regular


    Jun 4, 2015
    Lahore, Pakistan
    No I won't be leaving it all day though, but when I'm let's say browsing on my computer and my phone is sitting there idle so I just thought that why not connect it to laptop so that it charges meanwhile and doesn't drop battery on idle.
    Currently I'm in office and I'll be sitting here for like 8 hours, so during this time I have it connected to the computer. When I return to home I normally have 40% left on the battery, this way I'll have 100% ;)
  4. LoveToMacRumors macrumors 68020


    Feb 15, 2015
    I believe so even though everyone will disagree with me.

    I charge it to 100%, leave it plugged in for another 10min then unplug it.

    Conclusion: after 3 years, my iPhone 6 has a battery wear of only 6%

  5. joeblow7777 macrumors 603

    Sep 7, 2010
    I’d say, just use the phone and not worry about it. Your battery should last years with normal use before it degrades noticeably.
  6. Relentless Power macrumors Penryn

    Relentless Power

    Jul 12, 2016
    As others have noted, everybody treats their iPhones differently with charging cycles. When my iPhone is not being used, I typically have it on the charger if applicable. That's my regiment, but everyone will vary.
  7. NovemberWhiskey macrumors 68040


    May 18, 2009
    Not harmful unless it gets too hot. So if you have it charging while navigating on a hot day on the dashboard, it will decrease battery life.

    If you maintain the optimal temp, then no. Keeping it plugged in won’t harm it.
  8. bambooshots macrumors 65816


    Jul 25, 2013
    If he’s a normal user, the figure may be only a year and a half to two years.

    IIRC Apple states the batteries are guaranteed to hold 80% charge after 500 charge/discharge cycles for the iPhone.
  9. Newtons Apple macrumors Core

    Newtons Apple

    Mar 12, 2014
    Jacksonville, Florida
    Use you phone and enjoy the technology. What are you saving it for? Use it and charge it while sleeping.
  10. Nozuka macrumors 68020

    Jul 3, 2012
    i think it won't hurt the battery. my macbook is on the charger most of the time and still has 88% capacity after 5 years.
  11. Hey Now macrumors member

    Apr 7, 2010
    Lithium ion batteries don’t like to spend excessive amounts of time in a completely charged or completely discharged state. When storing them for extended periods, it’s generally recommended they be stored somewhere around mid-capacity (the exact percentage differs in various sources I’ve found). Keeping a lithium ion topped off at 100% to reduce cycle-related stress is false economy, because it then experiences the stress of being continuously fully charged - which it wouldn’t have otherwise experienced had it been cycled normally.

    My personal practice with my devices and lithium ion flashlight batteries is to charge and use the batteries as needed, avoiding excessive time at 100% or 0%, and most critically, avoiding hot temperatures for any period of time. Leaving a lithium ion in a hot car is the worst thing you can do if you want to maximize your battery longevity.
  12. eyoungren macrumors Core


    Aug 31, 2011
    ten-zero-eleven-zero-zero by zero-two
    Since 2009 when I got my first smartphone every phone I have owned has been plugged in at night and served as a nightstand clock and alarm.

    So, roughly eight hours of being plugged in with the screen on.

    Here where my 6s+ is after two years.

    File 26-09-2017, 06 05 40.png File 26-09-2017, 06 05 24.png
  13. Catul macrumors newbie

    Aug 3, 2010
    What app are you using to display this information (charge cycles etc)?
  14. AlphaGuitarist macrumors 6502a


    Nov 12, 2014
    This is in line with my personal experience. I checked the battery stats on my 6s Plus a couple of days ago and the battery was at 85% with 497 charge cycles. I've had the phone since February 2016.
  15. macrumors 604

    May 26, 2016
    Unless you’re on iOS 9, that app data is not valid. Since iOS 10 Apple has stopped the APIs that expose system data.
  16. LoveToMacRumors macrumors 68020


    Feb 15, 2015
    Just search Battery Life on the App sotre, there's a few app that can give you that battery wear information, you can delete the app after. It's only a few MB
  17. ventmore macrumors 6502a

    Jul 13, 2008
    I thought I remembered reading that they’d stopped apps accessing that data reliably. It seemed a little suspect when I tried one of the battery apps from the store the other day and it said my iPhone 7+, which I got 2 weeks after launch, had 0% battery wear. :)
  18. MrX8503 macrumors 68020

    Sep 19, 2010
    I would let it drain down once in a while. For normal usage you should charge it when it hits 50%
  19. Patrick3949 Suspended

    Aug 22, 2017
    Yes I charge my phone in night everyday and I don't have problem with battery :)
  20. macrumors 604

    May 26, 2016
    Definitely not required.
  21. Newtons Apple macrumors Core

    Newtons Apple

    Mar 12, 2014
    Jacksonville, Florida
    That is just plain wrong.

    Apple intended for us to charge it anytime. Basically too many worry about the battery when it will take care of itself. Just charge at night while sleeping and repeat daily.
  22. dumastudetto macrumors 68040

    Aug 28, 2013
    We all buy new iPhones every year anyway so why worry?
  23. MrX8503 macrumors 68020

    Sep 19, 2010
    Apple does implement safeguards so you can use it any way you want, but that’s the optimal usage for lithium batteries.

    For long storage, you also want to store at 50%
  24. ABC5S Suspended


    Sep 10, 2013
    Also interested in the app he is using. I know about other apps but I like to know about where you get this one and what the name of it is
  25. bufffilm, Sep 28, 2017
    Last edited: Sep 28, 2017

    bufffilm Suspended


    May 3, 2011
    Correction: Some of us buy new iPhones every year.

    Neither I nor my three siblings (and their families) buy new phones every year.

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