Any issue with discharging battery?

Discussion in 'Apple Watch' started by LevMac, Jul 5, 2015.

  1. LevMac macrumors 6502

    LevMac

    Joined:
    Feb 23, 2008
    Location:
    QLD, Australia
    #1
    Hey guys, its been twice since my watch has gone completely flat and I've had to charge it from 0%. Is it much of a problem if the battery completely dies off and then charging it back again? Or should you be charging it before it goes completely flat?

    Thankyou
     
  2. xraytech, Jul 5, 2015
    Last edited: Jul 6, 2015

    xraytech macrumors 68020

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    #2
    That is the worst thing you can do to the longevity of a Lithium Ion battery. Better to set it to charge when you go to sleep.
     
  3. LevMac thread starter macrumors 6502

    LevMac

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    #3
    I guess makes no difference if you let your battery discharge by 25% and charging it back up 100% four times counts as one charge cycle anyway
     
  4. Mac2me macrumors 6502a

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    Jun 10, 2015
    #4
    OP, are you seeing it discharge at a rapid unusual pattern or is this just with a lot of use or maybe an app that sucks up battery? Reason I ask is that when I first got mine while it was on the charger the first or second night, I noticed it was discharging while on the charger. A hard reboot and that fixed it.
     
  5. LevMac thread starter macrumors 6502

    LevMac

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    #5
    Hey Mac2me, sorry should have made my post about clearer. It is not discharging on its own. My question was, is it harmful to have let the battery drain completely twice since I have had the watch? Im guessing it won't harm the battery, as it's no different to letting the battery drain to 75% from 100% and doing this 4 times, still completes ONE discharge anyway...
     
  6. Mlrollin91 macrumors G4

    Mlrollin91

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    #6
    The only time you should ever allow a lithium ion battery to completely drain is when calibrating it. Allowing it to completely die will indeed hurt the health of the battery in the long run. I never let any of my batteries ever drop below 20%.

    Just because it still counts as one cycle doesn't mean anything. Lower the battery when you plug it in means a longer charge time. Longer charge time means higher temperatures. Higher temperatures shorten battery health. Therefore 4 charges from 75->100 is better than 1 charge from 0->100.
     
  7. TrueBlou macrumors demi-god

    TrueBlou

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    Scotland
    #7
    As above, spot on answer. Although I would say your not going to do any damage with the occasional complete discharge of the battery, just don't make a habit out of it.

    Remember when a battery is quoted as say, 500 charge cycles, it doesn't mean that that's all it gets then it stops working. It just means that after that many full charge cycles it's no longer at its optimum.
    However you'll usually find that by doing more frequent, smaller charges the battery will be in much better condition after the same length of time than it would be if you had done full discharges.
     
  8. LevMac thread starter macrumors 6502

    LevMac

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    #8
    Thanks TrueBlou, I've had my Watch since launch day, and its only been fully discharged "twice" since and thats it.
    Hopefully this isn't an issue, my OCD is kicking in now lol
     
  9. Zxxv macrumors 68040

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    UK
    #9
    how can you manage to do short charges if you are out and about using it?
     
  10. xraytech, Jul 6, 2015
    Last edited: Jul 6, 2015

    xraytech macrumors 68020

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    #10
    If you're out and about using it... you're out and about using it. Don't think to much about it and keep it simple.

    When you go to sleep, set you AW to charge. That's is really all you have to do.
     
  11. xraytech macrumors 68020

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    #11
  12. LevMac thread starter macrumors 6502

    LevMac

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    #12
    Thanks for the link.

    So does one complete cycle also work in this way:
    Charging watch to 100% then using it say until 70% then putting it back on charge to 100% (theres 30% charging)
    Then after taking it off with 100% then using it until say 30% then putting it back on charge to 100% (theres 70% charging) which then completes one cycle right?
     
  13. Mlrollin91 macrumors G4

    Mlrollin91

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    #13
    Correct.
     
  14. cowfish macrumors member

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    Jul 23, 2009
    #14
    Everything said so far is correct, except 0% charge on the watch is not actually 0%, at that point, I'm guessing the watch probably has around 15-20% battery left which is why the watch will work for around two days in power reserve mode, it doesn't run for two days on 0% and power reserve mode uses so little battery because it's basically doing nothing unless you want a quick glimpse of the time, that it probably only uses 5 of that 20% battery that is left. Apple isn't going to let you damage your battery by deep discharging that easily, that would be a lot of warranty replacements.

    Also, don't take my numbers above as fact, I don't claim them to be, but you get the idea...
     
  15. LevMac thread starter macrumors 6502

    LevMac

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    QLD, Australia
    #15
    Thanks for your reply cowfish :)

    So basically in other words, even though I drained my battery till it switched off twice over the past 2 months, there is no difference of completing a "full discharge" as it is the equivalent to charging methods as I mentioned above?

    I just want to know that I haven't done anything "wrong" or "damaging" to my battery thats all. Will definitely not let it drain to 0% and past power reserve mode again.
     
  16. cowfish macrumors member

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    Jul 23, 2009
    #16
    It should be fine. Like I said, I cannot say with 100% certainty as I don't work for apple or engineer this stuff, but I do know a little about li-ion and Lipo batteries and if past experiences with other apple products prove to be the same, there is a built in charge circuit that will prevent easily damaging the battery.

    And yes, 30% + 70% battery levels before charging would equal one full charge cycle.

    I wouldn't sweat it. There is a warranty on it if anything should ever happen, and if you haven't already, I highly recommend Apple care. I don't usually buy it for any of my other Apple products, but as cheap as it is you cannot go wrong with getting it for the watch.
     

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