How safe it is to use fast charging everyday

Discussion in 'iPhone' started by scc04, Oct 5, 2017.

  1. scc04 macrumors newbie

    Joined:
    Oct 5, 2017
    #1
    Will receive my iPhone 8+ in a few days.

    How safe is it to use the fast charging function everyday ? Already bought the 29W USB-C Power Adapter and the necessary USB-C cable.
     
  2. blairian89 macrumors 6502

    blairian89

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    #2
    It’s safe to use it everyday if you want to. The phone will control itself to prevent damage - much as it always has on the iPad chargers before.
     
  3. davidg4781 macrumors 68020

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    #3
    I know it says it charges 50% in 30 minutes. Or up to 50%.

    What if I plug it in at 65%? Do I get much benefit from fast charging?
     
  4. blairian89 macrumors 6502

    blairian89

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    #4
    A diminished effect, yes.

    The charging slows down substantially at around the 80% mark to protect the battery. It is still faster than the 5W power brick that comes with the phone, however.
     
  5. 0000757 macrumors 68040

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    Dec 16, 2011
    #5
    Basically what they mean is that from 0%, it will only take 30 minutes to charge to 50%. After that it'll still charge faster than the standard 5V included charger, but at a reduced rate, and by 80% it charges at the standard rate.
     
  6. akash.nu macrumors 604

    akash.nu

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    #6
    I just use my iPad charger and that seems plenty fast for me. Not spending more on a damn charger.
     
  7. Steve121178 macrumors 601

    Steve121178

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  8. akash.nu macrumors 604

    akash.nu

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    #8
    People have weird fear. The other day my girlfriend asked if it’s ok to keep her phone on charge for the whole night.
     
  9. joeblow7777 macrumors 603

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    Sep 7, 2010
    #9
    Theoretically, a battery that charges too quickly or over-charges can overheat and cause a fire (ie. the Galaxy Note 7). Any non-defective device has safeguards to prevent this though. The battery shouldn't take in more current than it can handle, and it should stop drawing a current when it is full.

    This may not be what the OP is thinking about, but also theoretically, charging a battery more quickly also puts more stress on it and results in faster wear. I don't know if daily fast charging will have a significant effect on the battery's lifespan though.
     
  10. akash.nu macrumors 604

    akash.nu

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    May 26, 2016
    #10
    True. The note 7 issue was just a whacky situation altogether. I try to forget about it. But yeah too many charges will wear out the batter faster. I guess people change the device mostly before it even gets to that point.
     
  11. davidg4781 macrumors 68020

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    #11
    It may be because Android, at least the Tab 7 I was using, alerts you to remove the charger once the battery is full.
     
  12. nickchallis92 macrumors 6502a

    nickchallis92

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    #12
    I'm fairly certain fast charging and the Note 7 fires were not connected.
     
  13. JPack macrumors 601

    JPack

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    Mar 27, 2017
    #13
    Safe? Yes.

    Healthy? Questionable. Increased heat tends to speed battery aging.

    The glass back doesn't promote heat transfer. And many people have thick TPU cases which further trap the heat.
     
  14. Jimmy James macrumors 601

    Jimmy James

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  15. aakshey macrumors 68000

    aakshey

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    #15
    From my experience and what I’ve read, the difference between fast charge and the 5W charger for iPhone is like 5x wear.
     
  16. macduke macrumors G4

    macduke

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    #16
    It's definitely safe. What I wonder about is longevity.

    I've used rechargeable batteries for many years going back to being a kid in the early 90s. From my experience the faster the charge rate, the shorter the lifespan. For a while they kept coming out with faster and faster chargers until they got down to 15 minutes. But those batteries wouldn't last at all. I switched back to slower chargers, but it still wasn't ideal. Then I got a Powerex MH-C9000 WizardOne Charger-Analyzer on Amazon and some quality Eneloop batteries. That charger allows you to basically change the charging speed to each battery in the charger. I've found the sweet spot to be around 700 mA for those batteries.

    Now the iPhone battery uses a different chemistry altogether and it's probably more advanced but I still wonder if you did a test of two identical iPhones over time that were consistently drained down to the same level slowly throughout each day to remove variables except one is charged quickly and the other at a regular speed which would would have a longer lifespan? My bet is the slower charge rate but by how much might only be a trivial 1-2% with modern battery technology.
     
  17. Newtons Apple macrumors Core

    Newtons Apple

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    Jacksonville, Florida
    #17
    DO you really need fast charging? The 8+ has a huge battery and most can, with ease, get through a day and more allowing you to charge overnight and not use fast charging.
     
  18. bevsb2 macrumors 68000

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    Nov 23, 2012
    #18
    Just as an antidotal piece of info, I have been charging my iPhone X for the past 5 months on a 12W iPad charger daily and the battery capacity is still 100%.
     
  19. JPack macrumors 601

    JPack

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    Mar 27, 2017
    #19
    It's hard to make a full observation unless we know the starting capacity.

    In some cases, batteries leave the factory with an actual capacity that is above the design capacity. The Apple Store staff have a tool that can read the real capacity, such as 103%. But iOS won't display anything above 100%.
     
  20. steve23094 macrumors 68030

    steve23094

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    Apr 23, 2013
    #20
    That sounds like crap to me.
     
  21. davidg4781 macrumors 68020

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    #21
    Can’t you use CoconutBattery to show this? Or is it capped at 100% also?
     
  22. IowaLynn macrumors 65816

    IowaLynn

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    Feb 22, 2015
    #22
    It’s fine. Multiple Samsung, Huawei, Blackberry and iPhone X. Using the Apple USBC to Lightning and fast wireless charger from Sammy, flat and an upright.
     
  23. tonybarnaby macrumors 68000

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    Dec 3, 2017
    #23
    Correct. The issue was the physical size of the battery was too large, and it had no room to expand.
     
  24. Julienne macrumors member

    Julienne

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    Apr 26, 2018
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    Texas
    #24
    I've only used the 10W iPad charger for years on iPads and iPhones. The charging speed is faster than the 5W iPhone charger. I don't have exact numbers but I feel like it is 25% or more.
     
  25. aakshey macrumors 68000

    aakshey

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    Jun 13, 2016
    #25
    Fast charging ruined both my previous iPad Pro 10.5 devices.

    And from what I’ve read, the people witnessing the most battery degradation with their iPhone X are those using iPad 12W and 29W chargers. While those witnessing the least degradation are the ones using wireless charging or the 5W charger.
     

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